Alert archive / Wyoming / Teton County

Weather alerts in Teton County, Wyoming, 2020

86 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Teton County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts
86
Warnings
22
Watches
14
Advisories
21
Busiest month
August15 alerts
Busiest day
June 7, 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.

Teton County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings010%
Flash flood warnings00

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Cheyenne, WY: tornado warnings6183%650%14 min
NWS Cheyenne, WY: severe thunderstorm warnings1547651%25575%23 min
NWS Cheyenne, WY: flash flood warnings5260%367%30 min
NWS Riverton, WY: severe thunderstorm warnings451273%4139%22 min
NWS Riverton, WY: flash flood warnings20100%0
NWS Rapid City, SD: tornado warnings11282%1127%18 min
NWS Rapid City, SD: severe thunderstorm warnings41533619%82889%27 min
NWS Rapid City, SD: flash flood warnings10730%1191%88 min
NWS Billings, MT: severe thunderstorm warnings714142%14355%29 min
NWS Salt Lake City, UT: severe thunderstorm warnings341944%9340%17 min
NWS Salt Lake City, UT: flash flood warnings211052%1883%77 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.

IssuedProductOfficeLasted
Jan 7, 1:46 AM MSTWinter Weather AdvisoryRIW64 hr
Jan 10, 12:40 PM MSTWinter Weather AdvisoryRIW41 hr
Jan 12, 9:58 AM MSTWinter Storm WarningRIW19 hr
Jan 12, 9:58 AM MSTWinter Weather AdvisoryRIW19 hr
Jan 13, 5:45 AM MSTWinter Weather AdvisoryRIW35 hr
Jan 14, 9:34 PM MSTSpecial Weather StatementRIW101 min
Jan 16, 4:12 AM MSTWinter Weather AdvisoryRIW37 hr
Feb 1, 1:50 PM MSTWinter Weather AdvisoryRIW55 hr
Feb 4, 6:26 AM MSTWinter Storm WatchRIW33 hr
Feb 5, 3:41 AM MSTWinter Storm WarningRIW55 hr
Feb 7, 1:30 PM MSTWinter Weather AdvisoryRIW28 hr
Feb 14, 11:41 AM MSTWinter Storm WatchRIW16 hr
Feb 15, 3:43 AM MSTWinter Storm WarningRIW43 hr
Feb 15, 3:43 AM MSTWinter Weather AdvisoryRIW43 hr
Mar 6, 9:42 AM MSTFlood WatchRIW32 hr
Mar 13, 2:57 AM MDTWinter Storm WatchRIW11 hr
Mar 13, 1:52 PM MDTWinter Storm WarningRIW52 hr
Mar 13, 1:52 PM MDTWinter Weather AdvisoryRIW52 hr
Mar 30, 1:45 AM MDTWinter Storm WarningRIW45 hr
Mar 30, 1:45 AM MDTWinter Weather AdvisoryRIW45 hr
Apr 11, 2:31 AM MDTWinter Weather AdvisoryRIW35 hr
Apr 14, 12:47 PM MDTWinter Weather AdvisoryRIW47 hr
May 22, 3:08 PM MDTSpecial Weather StatementRIW37 min
May 29, 12:37 PM MDTSpecial Weather StatementRIW23 min
May 29, 2:12 PM MDTMesoscale DiscussionSPC2 hr
May 29, 2:37 PM MDTSpecial Weather StatementRIW23 min
May 30, 1:11 PM MDTSpecial Weather StatementRIW64 min
May 30, 1:45 PM MDTMesoscale DiscussionSPC90 min
Jun 3, 3:59 PM MDTSpecial Weather StatementRIW91 min
Jun 3, 5:35 PM MDTSpecial Weather StatementRIW55 min
Jun 6, 6:22 PM MDTSpecial Weather StatementRIW23 min
Jun 7, 2:22 AM MDTWinter Weather AdvisoryRIW30 hr
Jun 7, 2:30 AM MDTFreeze WatchRIW9 hr
Jun 7, 11:15 AM MDTFreeze WarningRIW22 hr
Jun 8, 11:38 AM MDTFreeze WarningRIW21 hr
Jun 21, 3:53 PM MDTSpecial Weather StatementRIW52 min
Jun 24, 4:58 PM MDTSpecial Weather StatementRIW32 min
Jul 1, 4:05 PM MDTSpecial Weather StatementRIW40 min
Jul 1, 5:20 PM MDTSpecial Weather StatementRIW40 min
Jul 1, 6:20 PM MDTSpecial Weather StatementRIW40 min
Jul 23, 6:18 PM MDTSpecial Weather StatementRIW57 min
Jul 25, 4:16 PM MDTSpecial Weather StatementRIW74 min
Jul 25, 5:01 PM MDTSpecial Weather StatementRIW44 min
Jul 29, 4:32 PM MDTSpecial Weather StatementRIW58 min
Jul 29, 5:41 PM MDTSpecial Weather StatementRIW49 min
Aug 3, 6:51 PM MDTSpecial Weather StatementRIW24 min
Aug 10, 12:12 PM MDTRed Flag WarningRIW32 hr
Aug 11, 12:12 PM MDTRed Flag WarningRIW3 days
Aug 18, 3:43 AM MDTRed Flag WarningRIW17 hr
Aug 20, 3:31 AM MDTFire Weather WatchRIW22 hr
Aug 24, 5:20 PM MDTSpecial Weather StatementRIW40 min
Aug 25, 7:00 PM MDTSpecial Weather StatementRIW60 min
Aug 25, 7:42 PM MDTSpecial Weather StatementRIW63 min
Aug 26, 2:44 PM MDTMesoscale DiscussionSPC91 min
Aug 26, 11:02 PM MDTSpecial Weather StatementRIW43 min
Aug 26, 11:48 PM MDTSpecial Weather StatementRIW42 min
Aug 28, 1:59 AM MDTFire Weather WatchRIW13 hr
Aug 28, 3:11 PM MDTRed Flag WarningRIW54 hr
Aug 31, 4:10 AM MDTFreeze WatchRIW99 min
Aug 31, 5:49 AM MDTFreeze WarningRIW27 hr
Sep 3, 2:37 PM MDTFire Weather WatchRIW44 hr
Sep 4, 12:31 PM MDTRed Flag WarningRIW3 days
Sep 7, 11:25 AM MDTHigh Wind WarningRIW17 hr
Sep 12, 1:44 PM MDTFire Weather WatchRIW24 hr
Sep 13, 1:18 PM MDTRed Flag WarningRIW32 hr
Sep 16, 1:46 PM MDTFire Weather WatchRIW22 hr
Sep 19, 6:19 PM MDTSpecial Weather StatementRIW26 min
Sep 19, 6:43 PM MDTSpecial Weather StatementRIW32 min
Sep 23, 2:43 AM MDTFire Weather WatchRIW12 hr
Sep 23, 2:21 PM MDTRed Flag WarningRIW53 hr
Oct 7, 2:05 PM MDTRed Flag WarningRIW30 hr
Oct 9, 1:40 PM MDTRed Flag WarningRIW30 hr
Oct 10, 2:12 PM MDTWinter Weather AdvisoryRIW22 hr
Oct 22, 7:17 PM MDTWinter Storm WatchRIW9 hr
Oct 23, 4:23 AM MDTWinter Storm WarningRIW50 hr
Oct 23, 4:23 AM MDTWinter Weather AdvisoryRIW58 hr
Nov 7, 3:32 AM MSTWinter Weather AdvisoryRIW37 hr
Nov 9, 2:15 PM MSTWinter Weather AdvisoryRIW56 hr
Nov 11, 1:06 AM MSTWinter Storm WarningRIW21 hr
Nov 12, 4:38 AM MSTWinter Storm WatchRIW10 hr
Nov 12, 2:41 PM MSTWinter Storm WarningRIW48 hr
Nov 14, 2:42 PM MSTWinter Weather AdvisoryRIW39 hr
Dec 16, 2:21 PM MSTWinter Weather AdvisoryRIW36 hr
Dec 19, 1:10 PM MSTWinter Weather AdvisoryRIW47 hr
Dec 25, 12:42 PM MSTWinter Storm WarningRIW41 hr
Dec 25, 12:42 PM MSTWinter Weather AdvisoryRIW41 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

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.