Alert archive / Utah / Summit County

Weather alerts in Summit County, Utah, 2022

81 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Summit County and its neighbors

Each county as a circle sized by its count in 2022. Tap one for its archive.

Alerts
81
Warnings
22
Watches
13
Advisories
27
Busiest month
July13 alerts
Busiest day
June 29, 20226 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Summit County, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings5420%20%
Flash flood warnings010%

Each office's whole area, 2022

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Salt Lake City, UT: tornado warnings040%
NWS Salt Lake City, UT: severe thunderstorm warnings1082874%17627%22 min
NWS Salt Lake City, UT: flash flood warnings1264465%7968%71 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 3, 3:04 PM MSTWinter Weather AdvisorySLC62 hr
Jan 4, 3:05 PM MSTWinter Storm WarningSLC43 hr
Feb 20, 3:12 PM MSTWinter Weather AdvisorySLC31 hr
Feb 21, 3:55 PM MSTWinter Weather AdvisorySLC52 hr
Mar 4, 2:51 PM MSTWinter Weather AdvisorySLC49 hr
Mar 7, 2:48 AM MSTWinter Storm WatchSLC13 hr
Mar 7, 3:19 PM MSTWinter Storm WarningSLC50 hr
Mar 7, 3:19 PM MSTWinter Weather AdvisorySLC56 hr
Mar 19, 2:58 PM MDTWinter Weather AdvisorySLC27 hr
Mar 28, 3:18 AM MDTWinter Weather AdvisorySLC48 hr
Apr 3, 12:37 PM MDTWind AdvisorySLC53 hr
Apr 4, 3:12 AM MDTWinter Weather AdvisorySLC34 hr
Apr 10, 4:22 AM MDTWinter Storm WatchSLC11 hr
Apr 10, 3:15 PM MDTWinter Storm WarningSLC60 hr
Apr 21, 3:25 AM MDTWinter Weather AdvisorySLC57 hr
Apr 21, 11:56 PM MDTWind AdvisorySLC45 min
Apr 22, 12:41 AM MDTHigh Wind WarningSLC3 hr
May 2, 9:11 PM MDTSevere Thunderstorm Warning Considerable damage threatSLC41 min
May 18, 10:52 AM MDTHard Freeze WatchSLC15 hr
May 18, 10:52 AM MDTHard Freeze WatchSLC28 hr
May 19, 2:00 AM MDTHard Freeze WarningSLC31 hr
May 19, 2:33 PM MDTHard Freeze WarningSLC42 hr
May 27, 4:42 PM MDTSpecial Weather StatementSLC48 min
May 28, 8:57 PM MDTWinter Weather AdvisorySLC42 hr
Jun 16, 12:41 PM MDTWind AdvisorySLC57 hr
Jun 28, 6:32 PM MDTSpecial Weather StatementSLC28 min
Jun 28, 6:58 PM MDTSpecial Weather StatementSLC32 min
Jun 29, 12:10 PM MDTSpecial Weather StatementSLC35 min
Jun 29, 3:00 PM MDTSpecial Weather StatementSLC45 min
Jun 29, 3:06 PM MDTSpecial Weather StatementSLC39 min
Jun 29, 3:32 PM MDTSpecial Weather StatementSLC43 min
Jun 30, 5:19 PM MDTSpecial Weather StatementSLC26 min
Jun 30, 8:38 PM MDTSpecial Weather StatementSLC52 min
Jul 1, 1:59 AM MDTRed Flag WarningSLC4 days
Jul 7, 12:47 PM MDTRed Flag WarningSLC56 hr
Jul 17, 6:11 PM MDTSevere Thunderstorm WarningSLC34 min
Jul 17, 6:45 PM MDTSevere Thunderstorm WarningSLC45 min
Jul 17, 7:22 PM MDTSpecial Weather StatementSLC53 min
Jul 17, 8:17 PM MDTSpecial Weather StatementSLC28 min
Jul 18, 2:01 PM MDTSpecial Weather StatementSLC29 min
Jul 18, 2:29 PM MDTSpecial Weather StatementSLC31 min
Jul 22, 1:05 PM MDTMesoscale DiscussionSPC115 min
Jul 22, 3:58 PM MDTSpecial Weather StatementSLC32 min
Jul 22, 5:26 PM MDTSevere Thunderstorm WarningSLC49 min
Jul 22, 6:14 PM MDTSpecial Weather StatementSLC46 min
Aug 1, 11:06 AM MDTFlood WatchSLC13 hr
Aug 11, 1:44 PM MDTFlood WatchSLC3 days
Aug 11, 2:57 PM MDTSevere Thunderstorm WarningSLC37 min
Aug 11, 3:03 PM MDTSpecial Weather StatementSLC42 min
Aug 11, 3:16 PM MDTAreal Flood AdvisorySLC119 min
Aug 12, 3:22 PM MDTSpecial Weather StatementSLC38 min
Aug 21, 7:22 PM MDTAreal Flood AdvisorySLC3 hr
Sep 12, 2:28 PM MDTFlood WatchSLC55 hr
Sep 21, 12:19 PM MDTSevere Thunderstorm WatchSPC8 hr
Sep 21, 1:56 PM MDTMesoscale DiscussionSPC94 min
Oct 20, 12:07 PM MDTWinter Storm WatchSLC15 hr
Oct 21, 3:07 AM MDTWinter Storm WarningSLC69 hr
Oct 21, 3:07 AM MDTWinter Weather AdvisorySLC48 hr
Oct 26, 2:12 AM MDTWinter Weather AdvisorySLC28 hr
Oct 31, 2:12 PM MDTWinter Weather AdvisorySLC3 days
Nov 4, 3:21 AM MDTWinter Weather AdvisorySLC55 hr
Nov 4, 2:38 PM MDTWinter Storm WarningSLC43 hr
Nov 6, 1:52 PM MSTWinter Storm WatchSLC25 hr
Nov 7, 2:26 PM MSTWinter Storm WarningSLC66 hr
Nov 8, 7:09 AM MSTWinter Weather AdvisorySLC45 hr
Nov 27, 3:18 AM MSTWinter Weather AdvisorySLC59 hr
Nov 28, 1:04 PM MSTWinter Storm WarningSLC25 hr
Nov 30, 2:33 PM MSTWinter Storm WatchSLC24 hr
Dec 1, 2:13 PM MSTWinter Storm WarningSLC24 hr
Dec 4, 2:53 AM MSTWinter Weather AdvisorySLC48 hr
Dec 8, 2:48 PM MSTWinter Weather AdvisorySLC25 hr
Dec 10, 2:49 PM MSTWinter Storm WatchSLC13 hr
Dec 10, 2:49 PM MSTWinter Storm WarningSLC3 days
Dec 10, 2:49 PM MSTWinter Weather AdvisorySLC4 days
Dec 20, 3:25 AM MSTWinter Weather AdvisorySLC10 hr
Dec 20, 1:33 PM MSTWind Chill WarningSLC45 hr
Dec 20, 1:33 PM MSTWinter Storm WarningSLC39 hr
Dec 20, 1:33 PM MSTWinter Weather AdvisorySLC35 hr
Dec 26, 2:35 PM MSTWinter Weather AdvisorySLC54 hr
Dec 28, 2:55 PM MSTWinter Storm WatchSLC25 hr
Dec 29, 3:30 PM MSTWinter Storm WarningSLC4 days

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 archive20212023

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.