Alert archive / California / Tuolumne County
Weather alerts in Tuolumne County, California, 2017
64 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 64
- Warnings
- 25
- Watches
- 0
- Advisories
- 11
- Busiest month
- August23 alerts
- Busiest day
- March 21, 20177 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Tuolumne County in 2017 had a tornado report inside them.
Tuolumne County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 10 | 2 | 80% | 1 | 100% | 1 min |
| Flash flood warnings | 5 | 2 | 60% | 1 | 0% |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Hanford, CA: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Hanford, CA: severe thunderstorm warnings | 31 | 5 | 84% | 26 | 42% | 22 min |
| NWS Hanford, CA: flash flood warnings | 42 | 10 | 76% | 98 | 15% | 70 min |
| NWS Sacramento, CA: tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| NWS Sacramento, CA: severe thunderstorm warnings | 17 | 5 | 71% | 6 | 100% | 11 min |
| NWS Sacramento, CA: flash flood warnings | 2 | 0 | 100% | 29 | 0% |
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 8, 2:00 AM PST | Areal Flood Advisory | STO | 313 days |
| Jan 8, 6:22 AM PST | Areal Flood Warning | STO | 48 hr |
| Jan 8, 4:12 PM PST | Areal Flood Advisory | HNX | 2 hr |
| Jan 8, 6:09 PM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 10, 3:10 AM PST | Areal Flood Warning | STO | 60 hr |
| Jan 10, 9:44 PM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 12, 2:45 AM PST | Areal Flood Advisory | HNX | 3 hr |
| Jan 12, 2:31 PM PST | Areal Flood Warning | STO | 24 hr |
| Jan 18, 4:16 PM PST | Mesoscale Discussion | SPC | 5 hr |
| Jan 20, 8:19 AM PST | Areal Flood Advisory | HNX | 8 hr |
| Jan 20, 8:43 AM PST | Areal Flood Advisory | HNX | 4 hr |
| Jan 22, 5:47 PM PST | Areal Flood Advisory | HNX | 3 hr |
| Feb 7, 4:20 AM PST | Areal Flood Warning | STO | 36 hr |
| Feb 7, 9:26 AM PST | Areal Flood Warning | STO | 6 days |
| Feb 7, 11:56 AM PST | Flash Flood Warning | HNX | 109 min |
| Feb 7, 1:49 PM PST | Flash Flood Warning | HNX | 3 hr |
| Feb 7, 5:45 PM PST | Areal Flood Warning | HNX | 12 hr |
| Feb 9, 10:47 PM PST | Areal Flood Warning | HNX | 12 hr |
| Feb 10, 10:56 AM PST | Areal Flood Warning | HNX | 9 hr |
| Feb 18, 3:58 PM PST | Areal Flood Warning | STO | 5 days |
| Mar 21, 1:39 PM PDT | Tornado Warning | HNX | 36 min |
| Mar 21, 1:50 PM PDT | Severe Thunderstorm Warning | STO | 40 min |
| Mar 21, 2:16 PM PDT | Severe Thunderstorm Warning | HNX | 29 min |
| Mar 21, 2:29 PM PDT | Areal Flood Advisory | HNX | 3 hr |
| Mar 21, 2:29 PM PDT | Severe Thunderstorm Warning | STO | 61 min |
| Mar 21, 2:44 PM PDT | Severe Thunderstorm Warning | HNX | 31 min |
| Mar 21, 3:14 PM PDT | Severe Thunderstorm Warning | HNX | 31 min |
| Mar 21, 5:42 PM PDT | Areal Flood Advisory | HNX | 3 hr |
| Jun 22, 4:35 PM PDT | Special Weather Statement | HNX | 40 min |
| Jul 30, 5:48 PM PDT | Special Weather Statement | STO | 57 min |
| Aug 1, 3:49 PM PDT | Special Weather Statement | HNX | 41 min |
| Aug 2, 2:34 PM PDT | Special Weather Statement | STO | 41 min |
| Aug 2, 2:42 PM PDT | Special Weather Statement | HNX | 48 min |
| Aug 2, 3:28 PM PDT | Special Weather Statement | STO | 47 min |
| Aug 2, 3:43 PM PDT | Areal Flood Advisory | HNX | 3 hr |
| Aug 2, 4:01 PM PDT | Special Weather Statement | HNX | 29 min |
| Aug 2, 4:33 PM PDT | Special Weather Statement | HNX | 27 min |
| Aug 2, 5:00 PM PDT | Special Weather Statement | HNX | 30 min |
| Aug 3, 3:36 PM PDT | Special Weather Statement | HNX | 39 min |
| Aug 5, 3:30 PM PDT | Severe Thunderstorm Warning | HNX | 45 min |
| Aug 5, 4:00 PM PDT | Flash Flood Warning | HNX | 90 min |
| Aug 16, 2:40 PM PDT | Special Weather Statement | HNX | 35 min |
| Aug 18, 4:36 PM PDT | Special Weather Statement | HNX | 39 min |
| Aug 19, 2:11 PM PDT | Special Weather Statement | HNX | 49 min |
| Aug 19, 2:56 PM PDT | Special Weather Statement | STO | 49 min |
| Aug 19, 3:21 PM PDT | Special Weather Statement | HNX | 39 min |
| Aug 19, 3:39 PM PDT | Severe Thunderstorm Warning | STO | 51 min |
| Aug 20, 3:06 PM PDT | Special Weather Statement | STO | 39 min |
| Aug 20, 3:42 PM PDT | Special Weather Statement | HNX | 48 min |
| Aug 20, 3:47 PM PDT | Special Weather Statement | STO | 58 min |
| Aug 21, 2:25 PM PDT | Special Weather Statement | STO | 80 min |
| Aug 22, 5:58 PM PDT | Special Weather Statement | HNX | 47 min |
| Aug 22, 6:15 PM PDT | Severe Thunderstorm Warning | HNX | 30 min |
| Sep 3, 3:32 PM PDT | Flash Flood Warning | HNX | 58 min |
| Sep 3, 3:41 PM PDT | Special Weather Statement | STO | 34 min |
| Sep 8, 3:40 PM PDT | Special Weather Statement | HNX | 50 min |
| Sep 8, 4:30 PM PDT | Special Weather Statement | HNX | 45 min |
| Sep 9, 4:08 PM PDT | Special Weather Statement | STO | 82 min |
| Sep 13, 12:35 AM PDT | Special Weather Statement | STO | 25 min |
| Sep 13, 4:24 PM PDT | Special Weather Statement | HNX | 51 min |
| Sep 13, 4:41 PM PDT | Flash Flood Warning | HNX | 2 hr |
| Sep 13, 5:09 PM PDT | Severe Thunderstorm Warning | HNX | 36 min |
| Sep 13, 5:25 PM PDT | Special Weather Statement | HNX | 50 min |
| Sep 13, 5:48 PM PDT | Severe Thunderstorm Warning | HNX | 42 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 | 10 |
| Tornado Warning | 1 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 27 |
| Flooding | |
| Areal Flood Warning | 9 |
| Flash Flood Warning | 5 |
| Areal Flood Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.