Alert archive / California / Tuolumne County
Weather alerts in Tuolumne County, California, 2021
54 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Tuolumne County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 54
- Warnings
- 12
- Watches
- 7
- Advisories
- 23
- Busiest month
- December13 alerts
- Busiest day
- July 29, 20215 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Tuolumne 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 | 5 | 0 | 100% | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| 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 |
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 27, 12:48 AM PST | Areal Flood Advisory | STO | 5 hr |
| Jan 27, 11:50 AM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 27, 2:47 PM PST | Areal Flood Advisory | HNX | 6 hr |
| Jan 27, 3:31 PM PST | Mesoscale Discussion | SPC | 6 hr |
| Jan 27, 10:00 PM PST | Mesoscale Discussion | SPC | 6 hr |
| Jan 28, 8:29 AM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 28, 11:41 AM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 28, 2:34 PM PST | Areal Flood Advisory | HNX | 2 hr |
| Jan 28, 4:53 PM PST | Areal Flood Advisory | HNX | 9 hr |
| Jan 29, 1:43 AM PST | Areal Flood Advisory | HNX | 3 hr |
| May 29, 2:58 PM PDT | Special Weather Statement | STO | 62 min |
| May 29, 3:50 PM PDT | Special Weather Statement | HNX | 25 min |
| May 29, 4:32 PM PDT | Special Weather Statement | HNX | 28 min |
| Jun 2, 4:29 PM PDT | Areal Flood Advisory | HNX | 2 hr |
| Jun 24, 3:40 PM PDT | Special Weather Statement | STO | 110 min |
| Jun 26, 12:57 PM PDT | Fire Weather Watch | HNX | 23 hr |
| Jun 27, 11:57 AM PDT | Red Flag Warning | HNX | 56 hr |
| Jun 28, 5:44 PM PDT | Special Weather Statement | HNX | 46 min |
| Jun 29, 2:51 PM PDT | Mesoscale Discussion | SPC | 84 min |
| Jun 30, 3:42 PM PDT | Areal Flood Advisory | HNX | 2 hr |
| Jul 16, 12:39 PM PDT | Fire Weather Watch | HNX | 22 hr |
| Jul 17, 11:01 AM PDT | Red Flag Warning | HNX | 40 hr |
| Jul 28, 4:20 PM PDT | Flash Flood Warning | HNX | 55 min |
| Jul 28, 5:07 PM PDT | Flash Flood Warning | HNX | 3 min |
| Jul 28, 5:23 PM PDT | Flash Flood Warning | HNX | 82 min |
| Jul 29, 2:24 PM PDT | Special Weather Statement | HNX | 36 min |
| Jul 29, 3:21 PM PDT | Flash Flood Warning | HNX | 84 min |
| Jul 29, 4:41 PM PDT | Areal Flood Advisory | HNX | 64 min |
| Jul 30, 4:02 PM PDT | Flash Flood Warning | HNX | 116 min |
| Jul 30, 4:20 PM PDT | Special Weather Statement | HNX | 40 min |
| Oct 7, 1:28 PM PDT | Winter Weather Advisory | HNX | 25 hr |
| Oct 17, 9:19 AM PDT | Winter Weather Advisory | HNX | 20 hr |
| Oct 21, 12:23 PM PDT | Winter Storm Watch | HNX | 47 hr |
| Oct 21, 12:45 PM PDT | Flash Flood Watch | HNX | 4 days |
| Oct 23, 11:13 AM PDT | Winter Storm Warning | HNX | 58 hr |
| Oct 24, 9:52 AM PDT | Areal Flood Advisory | STO | 40 hr |
| Oct 24, 11:40 PM PDT | Areal Flood Warning | HNX | 14 hr |
| Oct 24, 11:46 PM PDT | Areal Flood Advisory | HNX | 6 hr |
| Oct 25, 12:06 AM PDT | Areal Flood Advisory | STO | 26 hr |
| Oct 25, 5:52 AM PDT | Areal Flood Advisory | HNX | 6 hr |
| Nov 7, 1:02 PM PST | Winter Weather Advisory | HNX | 47 hr |
| Dec 7, 12:33 PM PST | Winter Weather Advisory | HNX | 50 hr |
| Dec 10, 3:35 AM PST | Winter Storm Watch | HNX | 34 hr |
| Dec 11, 1:19 PM PST | Winter Storm Warning | HNX | 3 days |
| Dec 13, 3:01 PM PST | Mesoscale Discussion | SPC | 4 hr |
| Dec 13, 6:45 PM PST | Areal Flood Advisory | STO | 11 hr |
| Dec 14, 12:34 PM PST | Winter Storm Watch | HNX | 20 hr |
| Dec 15, 8:04 AM PST | Winter Storm Warning | HNX | 29 hr |
| Dec 19, 1:08 PM PST | Winter Storm Watch | HNX | 26 hr |
| Dec 20, 2:59 PM PST | Winter Storm Warning | HNX | 7 days |
| Dec 20, 2:59 PM PST | Winter Weather Advisory | HNX | 49 hr |
| Dec 23, 8:53 PM PST | Special Weather Statement | STO | 52 min |
| Dec 26, 3:15 AM PST | Winter Weather Advisory | HNX | 49 hr |
| Dec 28, 3:40 AM PST | Winter Weather Advisory | HNX | 46 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 8 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 16 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
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.