Alert archive / California / Monterey County
Weather alerts in Monterey County, California, 2020
73 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Monterey County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 73
- Warnings
- 14
- Watches
- 9
- Advisories
- 32
- Busiest month
- August12 alerts
- Busiest day
- August 16, 20204 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Monterey County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Francisco Bay Area, CA: severe thunderstorm warnings | 4 | 0 | 100% | 0 | ||
| NWS San Francisco Bay Area, CA: flash flood warnings | 0 | 1 | 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 9, 10:17 PM PST | High Surf Advisory | MTR | 65 hr |
| Jan 16, 10:36 AM PST | Areal Flood Advisory | MTR | 54 min |
| Jan 20, 8:52 AM PST | Beach Hazards Statement | MTR | 41 hr |
| Jan 23, 1:31 AM PST | Beach Hazards Statement | MTR | 57 hr |
| Jan 29, 1:10 PM PST | Beach Hazards Statement | MTR | 43 hr |
| Jan 31, 12:31 PM PST | High Wind Watch | MTR | 25 hr |
| Feb 1, 1:07 PM PST | Wind Advisory | MTR | 33 hr |
| Feb 2, 1:50 PM PST | Freeze Watch | MTR | 14 hr |
| Feb 3, 3:42 AM PST | Freeze Watch | MTR | 29 hr |
| Feb 3, 3:42 AM PST | Freeze Warning | MTR | 29 hr |
| Feb 4, 8:52 AM PST | Freeze Warning | MTR | 24 hr |
| Mar 11, 3:58 PM PDT | Special Weather Statement | MTR | 32 min |
| Mar 11, 4:21 PM PDT | Areal Flood Advisory | MTR | 54 min |
| Mar 14, 12:56 PM PDT | Wind Advisory | MTR | 16 hr |
| Mar 20, 12:56 PM PDT | Beach Hazards Statement | MTR | 62 hr |
| Mar 26, 3:15 PM PDT | Areal Flood Advisory | MTR | 81 min |
| Mar 26, 4:29 PM PDT | Special Weather Statement | MTR | 46 min |
| Apr 3, 2:08 PM PDT | Wind Advisory | MTR | 47 hr |
| Apr 6, 4:10 AM PDT | Beach Hazards Statement | MTR | 49 hr |
| Apr 16, 1:43 AM PDT | Beach Hazards Statement | MTR | 45 hr |
| Apr 18, 9:07 PM PDT | Beach Hazards Statement | MTR | 50 hr |
| May 22, 1:08 PM PDT | Excessive Heat Watch | MTR | 47 hr |
| May 24, 12:06 PM PDT | Heat Advisory | MTR | 4 days |
| Jun 1, 12:47 PM PDT | Heat Advisory | MTR | 56 hr |
| Jul 2, 2:00 AM PDT | Beach Hazards Statement | MTR | 4 days |
| Aug 12, 2:32 AM PDT | Excessive Heat Watch | MTR | 35 hr |
| Aug 13, 1:03 PM PDT | Excessive Heat Warning | MTR | 6 days |
| Aug 13, 1:03 PM PDT | Heat Advisory | MTR | 32 hr |
| Aug 15, 12:00 AM PDT | Heat Advisory | MTR | 69 hr |
| Aug 15, 2:19 AM PDT | Fire Weather Watch | MTR | 8 hr |
| Aug 15, 10:27 AM PDT | Red Flag Warning | MTR | 49 hr |
| Aug 16, 1:42 AM PDT | Special Weather Statement | MTR | 93 min |
| Aug 16, 2:41 AM PDT | Severe Thunderstorm Warning | MTR | 94 min |
| Aug 16, 3:55 AM PDT | Severe Thunderstorm Warning | MTR | 80 min |
| Aug 16, 6:37 AM PDT | Severe Thunderstorm Warning | MTR | 83 min |
| Aug 21, 11:04 AM PDT | Fire Weather Watch | MTR | 24 hr |
| Aug 22, 11:48 AM PDT | Red Flag Warning | MTR | 46 hr |
| Sep 1, 1:01 PM PDT | Excessive Heat Watch | MTR | 48 hr |
| Sep 3, 1:13 PM PDT | Excessive Heat Warning | MTR | 4 days |
| Sep 3, 1:13 PM PDT | Heat Advisory | MTR | 4 days |
| Sep 10, 11:09 PM PDT | Dense Fog Advisory | MTR | 13 hr |
| Sep 11, 7:21 PM PDT | Dense Fog Advisory | MTR | 14 hr |
| Sep 12, 6:34 PM PDT | Dense Fog Advisory | MTR | 14 hr |
| Sep 24, 7:40 AM PDT | Beach Hazards Statement | MTR | 36 hr |
| Sep 25, 4:52 AM PDT | High Surf Advisory | MTR | 15 hr |
| Sep 29, 1:42 PM PDT | Heat Advisory | MTR | 30 hr |
| Sep 29, 1:42 PM PDT | Heat Advisory | MTR | 3 days |
| Sep 29, 8:31 PM PDT | Fire Weather Watch | MTR | 13 hr |
| Sep 30, 9:07 AM PDT | Red Flag Warning | MTR | 69 hr |
| Oct 14, 12:34 PM PDT | Heat Advisory | MTR | 56 hr |
| Oct 30, 11:07 AM PDT | Beach Hazards Statement | MTR | 3 days |
| Nov 5, 12:04 PM PST | High Surf Advisory | MTR | 46 hr |
| Nov 6, 3:22 AM PST | Wind Advisory | MTR | 7 hr |
| Nov 7, 9:43 PM PST | Wind Advisory | MTR | 18 hr |
| Nov 8, 4:49 AM PST | Frost Advisory | MTR | 28 hr |
| Nov 9, 8:48 AM PST | Frost Advisory | MTR | 24 hr |
| Nov 9, 8:48 AM PST | Freeze Warning | MTR | 24 hr |
| Nov 10, 12:43 PM PST | Frost Advisory | MTR | 20 hr |
| Nov 14, 2:05 PM PST | Coastal Flood Warning | MTR | 93 min |
| Nov 14, 3:38 PM PST | Coastal Flood Advisory | MTR | 46 hr |
| Nov 23, 11:47 PM PST | High Surf Advisory | MTR | 60 hr |
| Nov 29, 5:59 AM PST | Beach Hazards Statement | MTR | 52 hr |
| Dec 1, 11:28 AM PST | Beach Hazards Statement | MTR | 3 days |
| Dec 6, 3:38 AM PST | Beach Hazards Statement | MTR | 52 hr |
| Dec 6, 3:38 AM PST | High Surf Warning | MTR | 65 hr |
| Dec 8, 7:23 AM PST | High Surf Advisory | MTR | 32 hr |
| Dec 12, 6:02 AM PST | Coastal Flood Advisory | MTR | 3 days |
| Dec 12, 6:02 AM PST | High Surf Advisory | MTR | 61 hr |
| Dec 14, 7:21 PM PST | Beach Hazards Statement | MTR | 32 hr |
| Dec 14, 7:21 PM PST | High Surf Advisory | MTR | 44 hr |
| Dec 29, 4:09 AM PST | Beach Hazards Statement | MTR | 42 hr |
| Dec 30, 3:13 AM PST | Coastal Flood Warning | MTR | 2 hr |
| Dec 30, 5:22 AM PST | High Surf Advisory | MTR | 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 | |
| Severe Thunderstorm Warning | 3 |
| Special Weather Statement | 3 |
| Flooding | |
| Areal Flood Advisory | 3 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 3 |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 3 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
| Coast and beach | |
| Coastal Flood Warning | 2 |
| High Surf Warning | 1 |
| Coastal Flood Advisory | 2 |
| High Surf Advisory | 8 |
| Beach Hazards Statement | 15 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.