Alert archive / California / San Benito County
Weather alerts in San Benito County, California, 2021
44 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
San Benito County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 44
- Warnings
- 8
- Watches
- 8
- Advisories
- 27
- Busiest month
- December13 alerts
- Busiest day
- January 28, 20214 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
San Benito County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Francisco Bay Area, CA: flash flood warnings | 16 | 2 | 88% | 30 | 7% | 354 min |
| NWS Sacramento, CA: tornado warnings | 2 | 1 | 50% | 4 | 25% | 2 min |
| NWS Sacramento, CA: severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| NWS Sacramento, CA: flash flood warnings | 3 | 1 | 67% | 8 | 13% | 96 min |
| NWS Los Angeles, CA: tornado warnings | 0 | 2 | 0% | |||
| NWS Los Angeles, CA: severe thunderstorm warnings | 0 | 4 | 0% | |||
| NWS Los Angeles, CA: flash flood warnings | 5 | 0 | 100% | 9 | 0% | |
| NWS Medford, OR: severe thunderstorm warnings | 2 | 0 | 100% | 0 | ||
| NWS Medford, OR: flash flood warnings | 3 | 1 | 67% | 3 | 33% | 3 min |
| NWS Hanford, CA: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Hanford, CA: severe thunderstorm warnings | 5 | 0 | 100% | 6 | 0% | |
| NWS Hanford, CA: flash flood warnings | 17 | 1 | 94% | 20 | 10% | 298 min |
| NWS San Diego, CA: severe thunderstorm warnings | 15 | 4 | 73% | 19 | 32% | 17 min |
| NWS San Diego, CA: flash flood warnings | 24 | 7 | 71% | 76 | 28% | 67 min |
| NWS Phoenix, AZ: severe thunderstorm warnings | 128 | 54 | 58% | 151 | 83% | 21 min |
| NWS Phoenix, AZ: flash flood warnings | 255 | 102 | 60% | 196 | 85% | 87 min |
| NWS Las Vegas, NV: tornado warnings | 0 | 2 | 0% | |||
| NWS Las Vegas, NV: severe thunderstorm warnings | 77 | 27 | 65% | 113 | 57% | 22 min |
| NWS Las Vegas, NV: flash flood warnings | 130 | 42 | 68% | 118 | 73% | 82 min |
| NWS Eureka, CA: severe thunderstorm warnings | 0 | 2 | 0% | |||
| NWS Eureka, CA: flash flood warnings | 2 | 0 | 100% | 1 | 0% | |
| NWS Reno, NV: tornado warnings | 0 | 1 | 0% | |||
| NWS Reno, NV: severe thunderstorm warnings | 9 | 0 | 100% | 6 | 0% | |
| NWS Reno, NV: flash flood warnings | 13 | 4 | 69% | 20 | 35% | 110 min |
An office's figures cover every county it serves, including across state lines.
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 5, 4:02 AM PST | Dense Fog Advisory | MTR | 7 hr |
| Jan 16, 2:29 AM PST | Wind Advisory | MTR | 4 days |
| Jan 17, 12:25 PM PST | Fire Weather Watch | MTR | 21 hr |
| Jan 18, 9:52 AM PST | Red Flag Warning | MTR | 29 hr |
| Jan 25, 2:55 AM PST | High Wind Watch | MTR | 12 hr |
| Jan 25, 2:42 PM PST | Wind Advisory | MTR | 61 hr |
| Jan 27, 2:11 PM PST | Areal Flood Advisory | MTR | 5 hr |
| Jan 27, 4:02 PM PST | Areal Flood Advisory | MTR | 3 hr |
| Jan 27, 7:32 PM PST | Areal Flood Advisory | MTR | 3 hr |
| Jan 27, 10:39 PM PST | Areal Flood Advisory | MTR | 4 hr |
| Jan 28, 4:33 AM PST | Areal Flood Advisory | MTR | 11 hr |
| Mar 10, 9:55 AM PST | Flash Flood Watch | MTR | 12 hr |
| Mar 15, 2:30 AM PDT | Frost Advisory | MTR | 31 hr |
| May 18, 4:47 AM PDT | Wind Advisory | MTR | 48 hr |
| Jun 6, 1:48 PM PDT | Wind Advisory | MTR | 30 hr |
| Jun 14, 1:17 PM PDT | Excessive Heat Warning | MTR | 4 days |
| Jun 14, 1:17 PM PDT | Heat Advisory | MTR | 4 days |
| Jun 18, 9:06 PM PDT | Heat Advisory | MTR | 23 hr |
| Jul 7, 12:20 PM PDT | Excessive Heat Watch | MTR | 15 hr |
| Jul 8, 3:33 AM PDT | Excessive Heat Warning | MTR | 4 days |
| Jul 16, 11:20 AM PDT | Fire Weather Watch | MTR | 26 hr |
| Jul 17, 1:47 PM PDT | Red Flag Warning | MTR | 37 hr |
| Oct 7, 2:21 PM PDT | Fire Weather Watch | MTR | 61 hr |
| Oct 9, 1:50 PM PDT | Wind Advisory | MTR | 54 hr |
| Oct 10, 3:03 AM PDT | Red Flag Warning | MTR | 62 hr |
| Oct 22, 1:38 PM PDT | Wind Advisory | MTR | 57 hr |
| Oct 24, 8:19 PM PDT | Areal Flood Advisory | MTR | 9 hr |
| Nov 3, 5:42 AM PDT | Dense Fog Advisory | MTR | 3 hr |
| Nov 15, 11:53 PM PST | Dense Fog Advisory | MTR | 11 hr |
| Nov 23, 1:46 PM PST | Frost Advisory | MTR | 19 hr |
| Nov 24, 2:49 PM PST | Frost Advisory | MTR | 18 hr |
| Dec 5, 7:06 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Dec 6, 12:18 AM PST | Dense Fog Advisory | MTR | 10 hr |
| Dec 10, 1:42 PM PST | Freeze Warning | MTR | 18 hr |
| Dec 11, 12:58 PM PST | Wind Advisory | MTR | 51 hr |
| Dec 11, 5:35 PM PST | Freeze Warning | MTR | 14 hr |
| Dec 12, 8:41 AM PST | Flash Flood Watch | MTR | 40 hr |
| Dec 12, 11:55 AM PST | High Wind Warning | MTR | 34 hr |
| Dec 13, 12:00 PM PST | Flood Watch | MTR | 13 hr |
| Dec 23, 9:56 AM PST | Areal Flood Advisory | MTR | 2 hr |
| Dec 25, 2:34 PM PST | Areal Flood Advisory | MTR | 5 hr |
| Dec 27, 6:35 AM PST | Areal Flood Advisory | MTR | 4 hr |
| Dec 27, 8:54 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Dec 29, 3:43 PM PST | Special Weather Statement | MTR | 32 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 | |
| Special Weather Statement | 1 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 10 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.