Alert archive / Idaho / Jefferson County
Weather alerts in Jefferson County, Idaho, 2018
104 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 104
- Warnings
- 37
- Watches
- 9
- Advisories
- 23
- Busiest month
- May28 alerts
- Busiest day
- May 31, 201815 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 4 tornado warnings covering Jefferson County in 2018 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 0 minutes after it went out.
Jefferson County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 1 | 100% | 0 min |
| Severe thunderstorm warnings | 16 | 7 | 56% | 6 | 17% | 5 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pocatello, ID: tornado warnings | 10 | 3 | 70% | 14 | 14% | 12 min |
| NWS Pocatello, ID: severe thunderstorm warnings | 65 | 20 | 69% | 106 | 70% | 17 min |
| NWS Pocatello, ID: flash flood warnings | 1 | 1 | 0% | 21 | 24% | 40 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 9, 8:07 AM MST | Special Weather Statement | PIH | 3 hr |
| Jan 10, 8:42 AM MST | Special Weather Statement | PIH | 63 min |
| Mar 11, 5:06 PM MDT | Special Weather Statement | PIH | 84 min |
| Mar 23, 3:47 PM MDT | Areal Flood Warning | PIH | 45 hr |
| Apr 6, 10:40 AM MDT | River Flood Warning | PIH | 24 hr |
| Apr 6, 3:25 PM MDT | Special Weather Statement | PIH | 65 min |
| Apr 7, 6:50 PM MDT | Severe Thunderstorm Warning | PIH | 40 min |
| Apr 7, 7:26 PM MDT | Severe Thunderstorm Warning | PIH | 20 min |
| Apr 18, 7:54 AM MDT | River Flood Warning | PIH | 71 hr |
| Apr 26, 11:15 AM MDT | River Flood Watch | PIH | 4 days |
| Apr 28, 3:29 PM MDT | River Flood Warning | PIH | 5 days |
| Apr 30, 1:14 PM MDT | River Flood Warning | PIH | 22 hr |
| May 4, 7:09 PM MDT | Special Weather Statement | PIH | 51 min |
| May 4, 7:52 PM MDT | Special Weather Statement | PIH | 53 min |
| May 6, 7:32 PM MDT | Special Weather Statement | PIH | 43 min |
| May 10, 8:10 AM MDT | River Flood Watch | PIH | 3 days |
| May 12, 2:45 PM MDT | Special Weather Statement | PIH | 30 min |
| May 12, 3:46 PM MDT | Special Weather Statement | PIH | 44 min |
| May 12, 3:54 PM MDT | Severe Thunderstorm Warning | PIH | 21 min |
| May 17, 6:13 PM MDT | Special Weather Statement | PIH | 32 min |
| May 23, 11:14 AM MDT | River Flood Watch | PIH | 26 hr |
| May 24, 1:31 PM MDT | River Flood Warning | PIH | 11 days |
| May 25, 12:24 PM MDT | River Flood Warning | PIH | 17 days |
| May 29, 5:22 PM MDT | Special Weather Statement | PIH | 53 min |
| May 30, 1:48 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 31, 12:33 PM MDT | Mesoscale Discussion | SPC | 117 min |
| May 31, 12:40 PM MDT | Severe Thunderstorm Warning | PIH | 35 min |
| May 31, 1:03 PM MDT | Tornado Warning | PIH | 27 min |
| May 31, 1:10 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 31, 1:16 PM MDT | Severe Thunderstorm Warning | PIH | 24 min |
| May 31, 1:27 PM MDT | Tornado Warning | PIH | 33 min |
| May 31, 1:44 PM MDT | Severe Thunderstorm Warning | PIH | 46 min |
| May 31, 3:57 PM MDT | Severe Thunderstorm Warning | PIH | 44 min |
| May 31, 4:25 PM MDT | Special Weather Statement | PIH | 35 min |
| May 31, 4:31 PM MDT | Tornado Warning | PIH | 29 min |
| May 31, 4:35 PM MDT | Mesoscale Discussion | SPC | 85 min |
| May 31, 4:46 PM MDT | Tornado Warning | PIH | 29 min |
| May 31, 4:50 PM MDT | Severe Thunderstorm Warning | PIH | 40 min |
| May 31, 5:15 PM MDT | Severe Thunderstorm Warning | PIH | 45 min |
| May 31, 5:24 PM MDT | Severe Thunderstorm Warning | PIH | 51 min |
| May 31, 6:38 PM MDT | Special Weather Statement | PIH | 82 min |
| Jun 4, 10:57 AM MDT | River Flood Advisory | PIH | 49 hr |
| Jun 11, 12:17 PM MDT | River Flood Advisory | PIH | 25 hr |
| Jun 17, 12:17 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 1:19 PM MDT | Severe Thunderstorm Warning | PIH | 23 min |
| Jun 17, 1:38 PM MDT | Severe Thunderstorm Warning | PIH | 37 min |
| Jun 18, 2:52 PM MDT | Special Weather Statement | PIH | 23 min |
| Jun 18, 3:48 PM MDT | Areal Flood Advisory | PIH | 101 min |
| Jun 18, 11:44 PM MDT | River Flood Warning | PIH | 3 days |
| Jun 19, 10:05 AM MDT | River Flood Advisory | PIH | 44 hr |
| Jun 21, 2:28 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Jun 23, 5:26 PM MDT | Special Weather Statement | PIH | 79 min |
| Jun 23, 6:59 PM MDT | Special Weather Statement | PIH | 61 min |
| Jul 16, 3:44 PM MDT | Special Weather Statement | PIH | 46 min |
| Jul 25, 2:14 PM MDT | Special Weather Statement | PIH | 61 min |
| Jul 25, 3:14 PM MDT | Special Weather Statement | PIH | 46 min |
| Jul 25, 3:27 PM MDT | Severe Thunderstorm Warning | PIH | 48 min |
| Jul 26, 3:48 PM MDT | Special Weather Statement | PIH | 42 min |
| Jul 31, 2:51 PM MDT | Red Flag Warning | PIH | 30 hr |
| Aug 1, 4:25 PM MDT | Special Weather Statement | PIH | 35 min |
| Aug 1, 4:51 PM MDT | Special Weather Statement | PIH | 39 min |
| Aug 1, 6:06 PM MDT | Severe Thunderstorm Warning | PIH | 39 min |
| Aug 2, 9:41 PM MDT | Red Flag Warning | PIH | 24 hr |
| Aug 5, 8:26 AM MDT | Special Weather Statement | PIH | 64 min |
| Aug 9, 1:31 PM MDT | Heat Advisory | PIH | 55 hr |
| Aug 9, 2:14 PM MDT | Red Flag Warning | PIH | 3 days |
| Aug 15, 2:03 PM MDT | Fire Weather Watch | PIH | 24 hr |
| Aug 16, 3:39 AM MDT | Red Flag Warning | PIH | 48 hr |
| Aug 17, 5:04 PM MDT | Special Weather Statement | PIH | 26 min |
| Aug 17, 5:34 PM MDT | Special Weather Statement | PIH | 86 min |
| Aug 17, 7:00 PM MDT | Special Weather Statement | PIH | 45 min |
| Aug 22, 3:02 PM MDT | Special Weather Statement | PIH | 43 min |
| Aug 22, 3:46 PM MDT | Severe Thunderstorm Warning | PIH | 44 min |
| Aug 22, 4:28 PM MDT | Severe Thunderstorm Warning | PIH | 47 min |
| Aug 23, 1:48 AM MDT | Fire Weather Watch | PIH | 11 hr |
| Aug 23, 1:04 PM MDT | Red Flag Warning | PIH | 56 hr |
| Aug 26, 9:32 AM MDT | Wind Advisory | PIH | 10 hr |
| Sep 6, 1:52 PM MDT | Fire Weather Watch | PIH | 25 hr |
| Sep 7, 2:30 PM MDT | Red Flag Warning | PIH | 31 hr |
| Sep 13, 2:07 PM MDT | Fire Weather Watch | PIH | 24 hr |
| Sep 14, 2:14 PM MDT | Red Flag Warning | PIH | 31 hr |
| Sep 15, 8:33 AM MDT | Wind Advisory | PIH | 12 hr |
| Sep 15, 9:03 PM MDT | Wind Advisory | PIH | 117 min |
| Sep 23, 4:32 AM MDT | Frost Advisory | PIH | 28 hr |
| Sep 23, 4:32 AM MDT | Freeze Watch | PIH | 33 hr |
| Sep 24, 1:29 PM MDT | Hard Freeze Warning | PIH | 20 hr |
| Sep 25, 1:35 PM MDT | Frost Advisory | PIH | 19 hr |
| Oct 3, 2:52 PM MDT | Blowing Dust Advisory | PIH | 4 hr |
| Oct 4, 2:26 AM MDT | Wind Advisory | PIH | 19 hr |
| Oct 24, 5:06 AM MDT | Dense Fog Advisory | PIH | 7 hr |
| Nov 1, 2:50 AM MDT | Wind Advisory | PIH | 41 hr |
| Nov 3, 2:05 AM MDT | Wind Advisory | PIH | 40 hr |
| Nov 22, 8:02 AM MST | Special Weather Statement | PIH | 3 hr |
| Nov 22, 1:01 PM MST | Winter Weather Advisory | PIH | 41 hr |
| Nov 27, 3:12 AM MST | Winter Weather Advisory | PIH | 30 hr |
| Nov 29, 2:09 PM MST | Winter Weather Advisory | PIH | 37 hr |
| Dec 10, 2:01 PM MST | Winter Weather Advisory | PIH | 48 hr |
| Dec 21, 11:34 AM MST | Wind Advisory | PIH | 3 hr |
| Dec 24, 4:50 AM MST | Winter Weather Advisory | PIH | 47 hr |
| Dec 24, 7:07 PM MST | Special Weather Statement | PIH | 3 hr |
| Dec 29, 1:01 PM MST | Winter Weather Advisory | PIH | 31 hr |
| Dec 29, 1:09 PM MST | Wind Advisory | PIH | 28 hr |
| Dec 30, 10:26 AM MST | Snow Squall Warning | PIH | 49 min |
| Dec 30, 11:31 AM MST | Mesoscale Discussion | SPC | 6 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 | 16 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 29 |
| Flooding | |
| Areal Flood Warning | 1 |
| River Flood Warning | 7 |
| River Flood Watch | 3 |
| Areal Flood Advisory | 1 |
| River Flood Advisory | 3 |
| Winter | |
| Snow Squall Warning | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Hard Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| Blowing Dust Advisory | 1 |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 7 |
| Fire Weather Watch | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.