Alert archive / California / Riverside County
Weather alerts in Riverside County, California, 2026
128 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Riverside County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 128
- Warnings
- 36
- Watches
- 18
- Advisories
- 65
- Busiest month
- August31 alerts
- Busiest day
- August 11, 202611 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Riverside County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 2 | 60% | 4 | 75% | 6 min |
| Flash flood warnings | 6 | 1 | 83% | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Diego, CA: severe thunderstorm warnings | 7 | 2 | 71% | 9 | 56% | 17 min |
| NWS San Diego, CA: flash flood warnings | 9 | 1 | 89% | 4 | 25% | 13 min |
| NWS Phoenix, AZ: severe thunderstorm warnings | 137 | 22 | 84% | 58 | 72% | 18 min |
| NWS Phoenix, AZ: flash flood warnings | 74 | 33 | 55% | 55 | 87% | 80 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 1, 3:06 AM PST | Areal Flood Advisory | SGX | 4 hr |
| Jan 1, 4:29 AM PST | Areal Flood Advisory | SGX | 8 hr |
| Jan 1, 7:04 AM PST | Areal Flood Advisory | SGX | 119 min |
| Jan 1, 9:02 AM PST | Areal Flood Advisory | SGX | 3 hr |
| Jan 1, 9:49 AM PST | Areal Flood Advisory | PSR | 3 hr |
| Jan 2, 12:55 AM PST | Dense Fog Advisory | PSR | 8 hr |
| Jan 6, 12:21 PM PST | High Wind Watch | SGX | 23 hr |
| Jan 6, 12:21 PM PST | Wind Advisory | SGX | 6 days |
| Jan 7, 11:34 AM PST | High Wind Warning | SGX | 4 days |
| Jan 7, 11:34 AM PST | Wind Advisory | SGX | 5 days |
| Jan 8, 11:24 AM PST | Freeze Warning | PSR | 44 hr |
| Jan 8, 11:24 AM PST | Wind Advisory | PSR | 29 hr |
| Jan 20, 7:12 PM PST | Dense Fog Advisory | SGX | 14 hr |
| Jan 24, 2:47 PM PST | Wind Advisory | SGX | 13 hr |
| Feb 3, 3:11 AM PST | Wind Advisory | SGX | 57 hr |
| Feb 14, 11:33 AM PST | High Wind Watch | SGX | 23 hr |
| Feb 14, 11:33 AM PST | Wind Advisory | SGX | 61 hr |
| Feb 14, 11:47 AM PST | Winter Storm Watch | SGX | 22 hr |
| Feb 14, 1:00 PM PST | Wind Advisory | PSR | 4 days |
| Feb 15, 9:57 AM PST | Winter Storm Warning | SGX | 5 days |
| Feb 16, 3:15 AM PST | Wind Advisory | SGX | 4 days |
| Feb 16, 11:59 AM PST | Areal Flood Advisory | SGX | 4 hr |
| Feb 16, 12:54 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Feb 18, 1:26 AM PST | Severe Thunderstorm Warning | SGX | 64 min |
| Feb 18, 2:28 AM PST | Severe Thunderstorm Warning | SGX | 62 min |
| Feb 18, 11:15 AM PST | Wind Advisory | SGX | 39 hr |
| Feb 18, 11:53 PM PST | Wind Advisory | PSR | 31 hr |
| Mar 3, 11:25 AM PST | Wind Advisory | SGX | 38 hr |
| Mar 4, 12:36 AM PST | Wind Advisory | PSR | 41 hr |
| Mar 5, 12:55 AM PST | Wind Advisory | SGX | 4 days |
| Mar 5, 12:45 PM PST | High Wind Watch | SGX | 12 hr |
| Mar 6, 12:23 AM PST | Wind Advisory | SGX | 64 hr |
| Mar 6, 11:51 AM PST | Wind Advisory | PSR | 24 hr |
| Mar 10, 12:04 PM PDT | Heat Advisory | SGX | 3 days |
| Mar 13, 10:31 AM PDT | Extreme Heat Watch | SGX | 26 hr |
| Mar 13, 12:04 PM PDT | Extreme Heat Watch | PSR | 72 hr |
| Mar 14, 12:18 PM PDT | Heat Advisory | SGX | 6 days |
| Mar 15, 1:35 AM PDT | Extreme Heat Watch | SGX | 32 hr |
| Mar 16, 9:16 AM PDT | Extreme Heat Warning | SGX | 5 days |
| Mar 16, 11:54 AM PDT | Extreme Heat Warning | PSR | 6 days |
| Mar 30, 11:12 AM PDT | Wind Advisory | SGX | 3 days |
| Apr 2, 10:51 AM PDT | Wind Advisory | SGX | 50 hr |
| Apr 3, 6:12 AM PDT | Wind Advisory | PSR | 6 hr |
| Apr 15, 11:58 PM PDT | Wind Advisory | PSR | 37 hr |
| Apr 16, 11:45 AM PDT | Wind Advisory | SGX | 29 hr |
| Apr 20, 11:27 AM PDT | Wind Advisory | SGX | 44 hr |
| Apr 24, 1:28 AM PDT | Wind Advisory | SGX | 71 hr |
| Apr 24, 11:32 AM PDT | Wind Advisory | PSR | 59 hr |
| May 3, 9:08 PM PDT | Wind Advisory | SGX | 24 hr |
| May 7, 11:47 AM PDT | Extreme Heat Watch | SGX | 22 hr |
| May 7, 12:36 PM PDT | Extreme Heat Watch | PSR | 22 hr |
| May 8, 10:01 AM PDT | Extreme Heat Warning | SGX | 3 days |
| May 8, 10:13 AM PDT | Extreme Heat Warning | PSR | 4 days |
| May 9, 10:51 AM PDT | Heat Advisory | SGX | 57 hr |
| May 14, 10:47 AM PDT | Wind Advisory | SGX | 4 days |
| May 14, 11:04 AM PDT | Wind Advisory | PSR | 4 days |
| May 24, 10:09 AM PDT | Wind Advisory | SGX | 4 days |
| Jun 4, 10:54 PM PDT | Fire Weather Watch | PSR | 12 hr |
| Jun 5, 11:02 AM PDT | Red Flag Warning | PSR | 36 hr |
| Jun 21, 1:58 PM PDT | Extreme Heat Watch | PSR | 34 hr |
| Jun 22, 2:28 PM PDT | Extreme Heat Warning | PSR | 3 days |
| Jun 23, 11:45 AM PDT | Fire Weather Watch | PSR | 37 hr |
| Jun 25, 1:07 AM PDT | Red Flag Warning | PSR | 4 days |
| Jun 25, 10:07 AM PDT | Wind Advisory | SGX | 4 days |
| Jun 25, 12:35 PM PDT | Wind Advisory | PSR | 3 days |
| Jul 3, 11:39 PM PDT | Extreme Heat Watch | PSR | 36 hr |
| Jul 5, 11:30 AM PDT | Extreme Heat Warning | PSR | 5 days |
| Jul 6, 12:09 AM PDT | Heat Advisory | SGX | 5 days |
| Jul 6, 12:09 AM PDT | Extreme Heat Warning | SGX | 5 days |
| Jul 8, 10:56 PM PDT | Extreme Heat Warning | PSR | 45 hr |
| Jul 10, 3:27 AM PDT | Dust Storm Advisory | PSR | 63 min |
| Jul 12, 12:00 PM PDT | Extreme Heat Watch | SGX | 23 hr |
| Jul 13, 10:37 AM PDT | Extreme Heat Warning | SGX | 3 days |
| Jul 13, 11:48 PM PDT | Extreme Heat Warning | PSR | 61 hr |
| Jul 16, 3:18 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Jul 16, 3:22 PM PDT | Special Weather Statement | SGX | 53 min |
| Jul 20, 11:54 AM PDT | Extreme Heat Watch | PSR | 24 hr |
| Jul 20, 12:11 PM PDT | Heat Advisory | SGX | 7 days |
| Jul 20, 12:11 PM PDT | Extreme Heat Watch | SGX | 22 hr |
| Jul 21, 10:23 AM PDT | Extreme Heat Warning | SGX | 6 days |
| Jul 21, 11:56 AM PDT | Extreme Heat Warning | PSR | 20 days |
| Jul 28, 1:56 AM PDT | Extreme Heat Warning | SGX | 13 days |
| Aug 4, 12:24 AM PDT | Heat Advisory | SGX | 6 days |
| Aug 6, 3:11 PM PDT | Special Weather Statement | PSR | 34 min |
| Aug 9, 1:21 PM PDT | Areal Flood Advisory | SGX | 110 min |
| Aug 10, 2:21 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Aug 10, 2:43 PM PDT | Severe Thunderstorm Warning | SGX | 47 min |
| Aug 10, 3:03 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Aug 10, 3:21 PM PDT | Flash Flood Warning | SGX | 117 min |
| Aug 10, 3:41 PM PDT | Special Weather Statement | SGX | 49 min |
| Aug 10, 10:26 PM PDT | Dust Storm Advisory | PSR | 64 min |
| Aug 11, 11:54 AM PDT | Special Weather Statement | SGX | 36 min |
| Aug 11, 12:44 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Aug 11, 1:12 PM PDT | Special Weather Statement | SGX | 33 min |
| Aug 11, 1:19 PM PDT | Areal Flood Advisory | SGX | 101 min |
| Aug 11, 1:21 PM PDT | Areal Flood Advisory | SGX | 99 min |
| Aug 11, 1:42 PM PDT | Special Weather Statement | SGX | 33 min |
| Aug 11, 1:46 PM PDT | Special Weather Statement | SGX | 29 min |
| Aug 11, 1:54 PM PDT | Flash Flood Warning | SGX | 2 hr |
| Aug 11, 2:23 PM PDT | Areal Flood Advisory | SGX | 97 min |
| Aug 11, 3:25 PM PDT | Severe Thunderstorm Warning | PSR | 50 min |
| Aug 11, 5:19 PM PDT | Special Weather Statement | PSR | 26 min |
| Aug 12, 5:08 PM PDT | Dust Storm Warning | PSR | 52 min |
| Aug 12, 5:53 PM PDT | Dust Storm Warning | PSR | 67 min |
| Aug 12, 6:08 PM PDT | Dust Storm Warning | SGX | 52 min |
| Aug 12, 6:25 PM PDT | Flash Flood Warning | PSR | 5 hr |
| Aug 12, 11:33 PM PDT | Extreme Heat Watch | PSR | 59 hr |
| Aug 15, 10:05 AM PDT | Extreme Heat Warning | PSR | 14 days |
| Aug 15, 4:16 PM PDT | Flash Flood Warning | PSR | 3 hr |
| Aug 18, 11:56 AM PDT | Heat Advisory | SGX | 56 hr |
| Aug 19, 12:58 AM PDT | Extreme Heat Warning | SGX | 11 days |
| Aug 21, 12:23 PM PDT | Heat Advisory | SGX | 8 days |
| Aug 22, 1:10 PM PDT | Extreme Heat Watch | SGX | 36 hr |
| Sep 7, 12:33 AM PDT | Extreme Heat Warning | PSR | 5 days |
| Sep 7, 11:09 AM PDT | Heat Advisory | SGX | 3 days |
| Sep 7, 11:09 AM PDT | Extreme Heat Warning | SGX | 4 days |
| Sep 8, 3:10 AM PDT | Heat Advisory | SGX | 35 hr |
| Sep 8, 5:08 PM PDT | Severe Thunderstorm Warning | SGX | 35 min |
| Sep 8, 5:21 PM PDT | Areal Flood Advisory | SGX | 114 min |
| Sep 9, 4:58 PM PDT | Areal Flood Advisory | SGX | 62 min |
| Sep 11, 2:30 AM PDT | Heat Advisory | SGX | 18 hr |
| Sep 24, 12:30 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Sep 24, 2:13 PM PDT | Areal Flood Advisory | SGX | 2 hr |
| Sep 24, 2:33 PM PDT | Flash Flood Warning | SGX | 90 min |
| Sep 24, 2:39 PM PDT | Special Weather Statement | PSR | 36 min |
| Sep 24, 3:31 PM PDT | Areal Flood Advisory | PSR | 2 hr |
| Sep 24, 4:32 PM PDT | Flash Flood Warning | SGX | 118 min |
| Sep 24, 5:02 PM PDT | Areal Flood Advisory | SGX | 51 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 5 |
| Special Weather Statement | 9 |
| Flooding | |
| Flash Flood Warning | 6 |
| Areal Flood Advisory | 21 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Heat | |
| Extreme Heat Warning | 17 |
| Extreme Heat Watch | 12 |
| Heat Advisory | 11 |
| Cold | |
| Freeze Warning | 1 |
| Wind and dust | |
| Dust Storm Warning | 3 |
| High Wind Warning | 1 |
| High Wind Watch | 3 |
| Dust Storm Advisory | 2 |
| Wind Advisory | 29 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.