Los Angeles County, California
Active alerts and forecasts are evaluated at the representative point shown below. Historical and climate evidence uses county-level data where available.
Representative point: Los Angeles County Census representative point, California
- LAT
- 34.19640
- LON
- -118.26186
- ZONE
- America/Los_Angeles
- COUNTY_FIPS
- 06037
0–100 DECISION INDEX, NOT EVENT PROBABILITY
EVIDENCE QUALITY 67.5/100
No audience or operational context supplied.
What this assessment says.
Elevated available evidence for extreme heat and heat index.
3 intersecting official alerts. Forecast guidance available for supported hazards.High historical or climate indices for extreme heat and heat index, flash flooding.
Historical and climate indices describe planning exposure, not current conditions.Evidence layers are available across the 19 monitored hazards.
All registered sources responded. Not scored is different from zero.Active directives
Extreme Heat Warning issued August 26 at 10:54AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Cuyama Valley; Santa Clarita Valley; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley; Los Angeles County San Gabriel Valley
OFFICIAL INSTRUCTION, VERBATIMDrink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Limit strenuous activities to early morning or evening hours. Take action when you see symptoms of heat exhaustion.SOURCE: NWS Los Angeles/Oxnard CA
Air Quality Alert issued August 25 at 7:55AM PDT by NWS Los Angeles/Oxnard CA
Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor
OFFICIAL INSTRUCTION, VERBATIMTo protect your health, check air quality levels and act as needed: * When Air Quality Index (AQI) levels are "Unhealthy for Sensitive Groups" (orange), sensitive groups as specified above should limit extended or intense outdoor activity. * When AQI is "Unhealthy" (red), everyone may experience health impacts. Sensitive groups should avoid extended time outdoors. * When AQI is "Very Unhealthy" (purple), sensitive groups should avoid all outdoor physical activity. Everyone else should avoid extended or intense outdoor activity. * When AQI is "Hazardous" (maroon), everyone should avoid all outdoor physical activity. * ADDITIONAL DETAILS... To help keep indoor air clean when air quality is poor: * Keep windows and doors closed * Run your air conditioner and/or an air purifier * Do not use whole house fans or swamp coolers that bring in outside air if you have other methods to stay cool * Avoid other sources of pollution such as fireplaces, candles, incense, and grilling To help minimize outdoor ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Try to delay trips to the gas station and the use of household chemicals until the eveningSOURCE: NWS Los Angeles/Oxnard CA
Air Quality Alert issued August 25 at 6:39AM PDT by NWS Los Angeles/Oxnard CA
Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor
OFFICIAL INSTRUCTION, VERBATIMTo protect your health, check air quality levels and act as needed: * When Air Quality Index (AQI) levels are "Unhealthy for Sensitive Groups" (orange), sensitive groups as specified above should limit extended or intense outdoor activity. * When AQI is "Unhealthy" (red), everyone may experience health impacts. Sensitive groups should avoid extended time outdoors. * When AQI is "Very Unhealthy" (purple), sensitive groups should avoid all outdoor physical activity. Everyone else should avoid extended or intense outdoor activity. * When AQI is "Hazardous" (maroon), everyone should avoid all outdoor physical activity. * ADDITIONAL DETAILS... To help keep indoor air clean when air quality is poor: * Keep windows and doors closed * Run your air conditioner and/or an air purifier * Do not use whole house fans or swamp coolers that bring in outside air if you have other methods to stay cool * Avoid other sources of pollution such as fireplaces, candles, incense, and grilling To help minimize outdoor ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Try to delay trips to the gas station and the use of household chemicals until the eveningSOURCE: NWS Los Angeles/Oxnard CA
Risk by hazard
Weights: active 40% · forecast 30% · history 20% · climate 10%
| Hazard | Assessment | Current and 14-day | Long-term evidence | Evidence |
|---|---|---|---|---|
| Extreme heat and heat indexCURRENT / NEAR-TERM | 44.3/100Moderate | ACTIVE52.5/10014-DAY50/100 | HISTORYNot scoredCLIMATE82.8/100 | 3 OF 4LAYERS AVAILABLEQUALITY 67.5/100 |
| Flash floodingHIGH LONG-TERM | 27.8/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORY98.5/100CLIMATE65.5/100 | 4 OF 4LAYERS AVAILABLEQUALITY 84.5/100 |
| Wildfire smoke and degraded air quality | 9/100Low | ACTIVE22.5/10014-DAYNot scored | HISTORYNot scoredCLIMATENot scored | 1 OF 4LAYERS AVAILABLEQUALITY 38.0/100 |
| Heavy rain and atmospheric rivers | 15.7/100Low | ACTIVENo matching alert14-DAY10.5/100 | HISTORY30.2/100CLIMATE65.5/100 | 4 OF 4LAYERS AVAILABLEQUALITY 84.5/100 |
| Lightning | 16.5/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORY75.2/100CLIMATENot scored | 3 OF 4LAYERS AVAILABLEQUALITY 77.5/100 |
| Urban flooding | 8.1/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORYNot scoredCLIMATE65.5/100 | 3 OF 4LAYERS AVAILABLEQUALITY 67.5/100 |
| Severe thunderstorms | 9.7/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORY41.2/100CLIMATENot scored | 3 OF 4LAYERS AVAILABLEQUALITY 77.5/100 |
| Extreme cold and wind chill | 3.2/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORYNot scoredCLIMATE17.2/100 | 3 OF 4LAYERS AVAILABLEQUALITY 67.5/100 |
| Blizzards | 1.5/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORYNot scoredCLIMATENot scored | 2 OF 4LAYERS AVAILABLEQUALITY 60.5/100 |
| Ice storms and freezing rain | 1.5/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORYNot scoredCLIMATENot scored | 2 OF 4LAYERS AVAILABLEQUALITY 60.5/100 |
| Winter storms and heavy snow | 1.5/100Low | ACTIVENo matching alert14-DAY5/100 | HISTORYNot scoredCLIMATENot scored | 2 OF 4LAYERS AVAILABLEQUALITY 60.5/100 |
| Tornadoes | 14.1/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORY70.6/100CLIMATENot scored | 2 OF 4LAYERS AVAILABLEQUALITY 55.0/100 |
| River flooding | 12.4/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORY29.1/100CLIMATE65.5/100 | 3 OF 4LAYERS AVAILABLEQUALITY 62.0/100 |
| Coastal flooding | 6.6/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORYNot scoredCLIMATE65.5/100 | 2 OF 4LAYERS AVAILABLEQUALITY 45.0/100 |
| Wildfires | 5.9/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORYNot scoredCLIMATE58.7/100 | 2 OF 4LAYERS AVAILABLEQUALITY 45.0/100 |
| Drought | 3.5/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORYNot scoredCLIMATE34.5/100 | 2 OF 4LAYERS AVAILABLEQUALITY 45.0/100 |
| Hail | 4.5/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORY22.5/100CLIMATENot scored | 2 OF 4LAYERS AVAILABLEQUALITY 55.0/100 |
| Hurricanes and tropical storms | 0/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORYNot scoredCLIMATENot scored | 1 OF 4LAYERS AVAILABLEQUALITY 38.0/100 |
| Storm surge | 0/100Low | ACTIVENo matching alert14-DAYNot scored | HISTORYNot scoredCLIMATENot scored | 1 OF 4LAYERS AVAILABLEQUALITY 38.0/100 |
Component evidence
Extreme heat and heat index
44.3/100 · Moderate3 of 4 layers available · evidence quality 67.5/100
- ACTIVE
- 52.5/1001 intersecting official alert.
- FORECAST
- 50/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 82.8/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
64.3/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Flash flooding
27.8/100 · Low4 of 4 layers available · evidence quality 84.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- 98.5/10086 NOAA county reports in 2016–2025; national midrank percentile 98.54. Reports are not unique storms.
- CLIMATE
- 65.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Wildfire smoke and degraded air quality
9/100 · Low1 of 4 layers available · evidence quality 38.0/100
- ACTIVE
- 22.5/1002 intersecting official alerts.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Heavy rain and atmospheric rivers
15.7/100 · Low4 of 4 layers available · evidence quality 84.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 10.5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- 30.2/1000 NOAA county reports in 2016–2025; national midrank percentile 30.15. Reports are not unique storms.
- CLIMATE
- 65.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Lightning
16.5/100 · Low3 of 4 layers available · evidence quality 77.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- 75.2/1001 NOAA county report in 2016–2025; national midrank percentile 75.17. Reports are not unique storms.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
26.5/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Urban flooding
8.1/100 · Low3 of 4 layers available · evidence quality 67.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 65.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
28.1/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Severe thunderstorms
9.7/100 · Low3 of 4 layers available · evidence quality 77.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- 41.2/10035 NOAA county reports in 2016–2025; national midrank percentile 41.18. Reports are not unique storms.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
19.7/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Extreme cold and wind chill
3.2/100 · Low3 of 4 layers available · evidence quality 67.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 17.2/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
23.2/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Blizzards
1.5/100 · Low2 of 4 layers available · evidence quality 60.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
31.5/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Ice storms and freezing rain
1.5/100 · Low2 of 4 layers available · evidence quality 60.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
31.5/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Winter storms and heavy snow
1.5/100 · Low2 of 4 layers available · evidence quality 60.5/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- 5/100Derived from the 14-day daily model series using published INSIT3 thresholds.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
31.5/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Tornadoes
14.1/100 · Low2 of 4 layers available · evidence quality 55.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- 70.6/1006 NOAA county reports in 2016–2025; national midrank percentile 70.62. Reports are not unique storms.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
River flooding
12.4/100 · Low3 of 4 layers available · evidence quality 62.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- 29.1/1001 NOAA county report in 2016–2025; national midrank percentile 29.06. Reports are not unique storms.
- CLIMATE
- 65.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Coastal flooding
6.6/100 · Low2 of 4 layers available · evidence quality 45.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 65.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Wildfires
5.9/100 · Low2 of 4 layers available · evidence quality 45.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 58.7/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Drought
3.5/100 · Low2 of 4 layers available · evidence quality 45.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- 34.5/100Recent 10-year county mean ranked against the NOAA 1991–2020 baseline series.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Hail
4.5/100 · Low2 of 4 layers available · evidence quality 55.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- 22.5/1006 NOAA county reports in 2016–2025; national midrank percentile 22.52. Reports are not unique storms.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Hurricanes and tropical storms
0/100 · Low1 of 4 layers available · evidence quality 38.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Storm surge
0/100 · Low1 of 4 layers available · evidence quality 38.0/100
- ACTIVE
- 0/100No matching active NWS alert at retrieval time.
- FORECAST
- Not scoredNo uniform location-level forecast product is available for this hazard.
- HISTORY
- Not scoredThis hazard is not uniformly county-coded in NOAA Storm Events; it remains unsupported rather than being forced into a county score.
- CLIMATE
- Not scoredNo defensible county climate proxy is available for this event hazard.
Technical missing-data bound
80/100 is the mathematical worst case if missing layers were maximally adverse. It is not an expected range, probability, or forecast.
Recommendations.
- 01Monitor linked issuing agencies and compare source issue, validity, and expiration times before acting.
- 02Use the highest active or forecast hazard as the planning driver; do not average away a severe local threat.
- 03Prioritize preparedness for extreme heat and heat index based on the currently confirmed score floor.
These recommendations never create, paraphrase, or override evacuation or shelter orders.
Sources
- AVAILABLE
Active alerts
NOAA / National Weather Service · retrieved 2026-08-26T19:51:07.968Z
CAP-compatible active alerts intersecting the evaluated point.
https://api.weather.gov/alerts/active?point=34.196398,-118.261862 - AVAILABLE
14-day forecast
Open-Meteo using NOAA and other national weather models · retrieved 2026-08-26T15:17:50.988Z
Daily cached model forecast retrieved 2026-08-26T15:17:50.988Z. Days 8–14 are model guidance, not deterministic NWS hazard forecasts.
https://api.open-meteo.com/v1/forecast?latitude=34.196398&longitude=-118.261862&daily=temperature_2m_max,temperature_2m_min,apparent_temperature_max,apparent_temperature_min,precipitation_sum,precipitation_probability_max,snowfall_sum,wind_gusts_10m_max,weather_code&temperature_unit=fahrenheit&wind_speed_unit=mph&precipitation_unit=inch&forecast_days=14&timezone=auto - AVAILABLE
National Risk Index supplemental baseline
FEMA · retrieved 2026-08-26T19:51:07.968Z
County-level March 2023 relative risk. Displayed as context; not substituted for the requested rolling 10-year component.
https://services.arcgis.com/HdtZMT2FmI4wPzTM/ArcGIS/rest/services/FEMA_National_Risk_Index/FeatureServer/0/query?geometry=-118.261862%2C34.196398&geometryType=esriGeometryPoint&inSR=4326&spatialRel=esriSpatialRelIntersects&outFields=STATE%2CCOUNTY%2CSTCOFIPS%2CNRI_VER%2CRISK_SCORE%2CRISK_RATNG%2CHWAV_RISKS%2CCWAV_RISKS%2CDRGT_RISKS%2CWFIR_RISKS%2CHRCN_RISKS%2CTRND_RISKS%2CHAIL_RISKS%2CLTNG_RISKS%2CRFLD_RISKS%2CWNTW_RISKS%2CISTM_RISKS&returnGeometry=false&f=json - AVAILABLE
2016–2025 county event history
NOAA / NCEI Storm Events · retrieved 2026-08-26T12:38:24Z
One NOAA Storm Events detail record; counts are reports, not unique storms. Seven hazards have complete county-coded coverage; unsupported hazard/geography combinations remain null.
https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/ - AVAILABLE
County temperature normal and series
NOAA / NCEI Climate at a Glance · retrieved 2026-08-26T19:51:07.968Z
1991–2020 normal compared with the latest complete rolling 10-year county series.
https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/time-series/CA-037/tavg/12/12/1991-2025.json?base_prd=true&begbaseyear=1991&endbaseyear=2020 - AVAILABLE
County precipitation normal and series
NOAA / NCEI Climate at a Glance · retrieved 2026-08-26T19:51:07.968Z
1991–2020 normal compared with the latest complete rolling 10-year county series.
https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/time-series/CA-037/pcp/12/12/1991-2025.json?base_prd=true&begbaseyear=1991&endbaseyear=2020
- The primary score is a confirmed 0–100 decision index, not an event probability. A technical worst-case bound remains available in component evidence when required data is missing, but it is not an expected range or forecast.
- Source outages and unsupported hazard layers are shown as unavailable or not scored. Missing evidence is never treated as zero.
- Days 8–14 use freely available model guidance. NOAA CPC outlooks do not provide deterministic location-level forecasts for every hazard.
- FEMA National Risk Index values use hazard-specific source windows and are supplemental. They are never labeled as the requested rolling 10-year history.
- Climate trend scores are county-level derived comparisons, not event forecasts. Tornado, hail, hurricane, surge, smoke, lightning-strike, blizzard, and ice-event projections remain unscored where no defensible source exists.
- Low or unscored risk does not mean safe. Follow current instructions from the issuing authority.