Alert archive / Utah / San Juan County

Weather alerts in San Juan County, Utah, 2014

92 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

San Juan County and its neighbors

Each county as a circle sized by its count in 2014. Tap one for its archive.

Alerts
92
Warnings
31
Watches
22
Advisories
35
Busiest month
August15 alerts
Busiest day
August 5, 20145 alerts

Over time

By month

Warning verification

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

San Juan County, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings5180%0
Flash flood warnings5180%617%23 min

Each office's whole area, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Junction, CO: tornado warnings010%
NWS Grand Junction, CO: severe thunderstorm warnings2150%284%1 min
NWS Grand Junction, CO: flash flood warnings21576%4414%82 min
NWS Salt Lake City, UT: severe thunderstorm warnings431370%8924%24 min
NWS Salt Lake City, UT: flash flood warnings532160%5942%70 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 27, 3:42 PM MSTWinter Storm WatchGJT35 hr
Jan 28, 3:04 PM MSTWinter Storm WarningGJT4 days
Feb 2, 1:15 PM MSTWinter Storm WatchGJT5 hr
Feb 2, 5:49 PM MSTWinter Storm WarningGJT53 hr
Feb 3, 3:40 AM MSTWinter Weather AdvisoryGJT43 hr
Feb 4, 8:51 PM MSTWinter Storm WatchGJT19 hr
Feb 10, 3:25 PM MSTDense Fog AdvisoryGJT13 hr
Feb 26, 2:13 PM MSTWinter Weather AdvisoryGJT43 hr
Feb 27, 3:37 AM MSTWinter Storm WatchGJT34 hr
Feb 28, 5:00 AM MSTWinter Storm WarningGJT59 hr
Mar 14, 3:15 PM MDTWind AdvisoryGJT29 hr
Mar 16, 3:05 PM MDTWind AdvisoryGJT30 hr
Mar 17, 3:31 AM MDTHigh Wind WarningGJT17 hr
Mar 26, 4:01 AM MDTWind AdvisoryGJT16 hr
Mar 29, 10:41 AM MDTWind AdvisoryGJT34 hr
Mar 30, 4:08 AM MDTBlowing Dust AdvisoryGJT17 hr
Mar 31, 2:45 PM MDTWind AdvisoryGJT30 hr
Apr 13, 12:33 PM MDTSpecial Weather StatementGJT42 min
Apr 13, 12:56 PM MDTAreal Flood AdvisoryGJT6 hr
Apr 21, 3:46 PM MDTWind AdvisoryGJT34 hr
Apr 24, 3:31 PM MDTWinter Storm WatchGJT23 hr
Apr 25, 3:00 PM MDTWinter Weather AdvisoryGJT54 hr
May 6, 10:21 AM MDTWind AdvisoryGJT11 hr
May 9, 3:04 AM MDTWinter Storm WatchGJT19 hr
May 9, 9:59 PM MDTWinter Weather AdvisoryGJT59 hr
May 11, 1:14 PM MDTAreal Flood WarningGJT9 hr
May 23, 1:26 PM MDTSevere Thunderstorm WarningSLC19 min
May 23, 1:47 PM MDTSevere Thunderstorm WarningSLC28 min
May 23, 2:14 PM MDTSevere Thunderstorm WarningSLC46 min
May 23, 2:58 PM MDTSevere Thunderstorm WarningSLC47 min
Jun 11, 1:46 PM MDTRed Flag WarningSLC56 hr
Jun 13, 2:19 PM MDTFire Weather WatchSLC24 hr
Jun 14, 3:10 AM MDTRed Flag WarningSLC4 days
Jun 16, 3:42 AM MDTWind AdvisoryGJT19 hr
Jun 16, 3:18 PM MDTWind AdvisoryGJT30 hr
Jun 21, 2:39 AM MDTRed Flag WarningSLC18 hr
Jun 23, 2:40 PM MDTFire Weather WatchSLC23 hr
Jun 24, 1:36 PM MDTRed Flag WarningSLC57 hr
Jun 26, 10:59 AM MDTWind AdvisoryGJT10 hr
Jun 28, 2:51 AM MDTFire Weather WatchSLC11 hr
Jun 28, 2:51 AM MDTRed Flag WarningSLC67 hr
Jul 2, 3:10 AM MDTRed Flag WarningSLC21 hr
Jul 2, 2:55 PM MDTRed Flag WarningSLC31 hr
Jul 8, 2:27 PM MDTFlash Flood WatchGJT69 hr
Jul 15, 3:56 AM MDTFlash Flood WatchGJT20 hr
Jul 16, 2:48 PM MDTAreal Flood AdvisoryGJT117 min
Jul 27, 2:14 PM MDTAreal Flood AdvisoryGJT3 hr
Jul 27, 9:09 PM MDTFlash Flood WatchGJT27 hr
Jul 28, 3:55 PM MDTFlash Flood WatchGJT31 hr
Jul 29, 1:39 PM MDTFlash Flood WarningGJT3 hr
Jul 29, 3:15 PM MDTAreal Flood AdvisoryGJT4 hr
Jul 29, 3:44 PM MDTAreal Flood AdvisoryGJT3 hr
Jul 31, 3:34 PM MDTSevere Thunderstorm WarningSLC56 min
Aug 3, 3:45 AM MDTFlash Flood WatchGJT20 hr
Aug 4, 8:37 PM MDTFlash Flood WarningGJT3 hr
Aug 4, 9:16 PM MDTFlash Flood WarningGJT3 hr
Aug 5, 1:37 AM MDTAreal Flood AdvisoryGJT7 hr
Aug 5, 2:41 AM MDTFlash Flood WatchGJT10 hr
Aug 5, 4:48 AM MDTFlash Flood WarningGJT4 hr
Aug 12, 2:13 PM MDTAreal Flood AdvisoryGJT3 hr
Aug 12, 2:46 PM MDTFlash Flood WatchGJT47 hr
Aug 13, 6:23 PM MDTAreal Flood AdvisoryGJT3 hr
Aug 13, 9:15 PM MDTAreal Flood AdvisoryGJT3 hr
Aug 14, 1:22 AM MDTAreal Flood AdvisoryGJT3 hr
Aug 14, 3:19 PM MDTSpecial Weather StatementGJT26 min
Aug 25, 9:12 PM MDTFlash Flood WatchGJT23 hr
Aug 27, 2:52 PM MDTAreal Flood AdvisoryGJT3 hr
Aug 27, 3:42 PM MDTAreal Flood AdvisoryGJT3 hr
Sep 7, 3:30 PM MDTFlash Flood WatchGJT53 hr
Sep 9, 8:11 AM MDTFlash Flood WarningSLC6 hr
Sep 9, 10:27 AM MDTAreal Flood WarningSLC10 hr
Sep 27, 2:32 PM MDTAreal Flood WarningSLC8 hr
Sep 27, 2:40 PM MDTMesoscale DiscussionSPC2 hr
Sep 27, 3:00 PM MDTFlash Flood WatchGJT27 hr
Sep 27, 6:06 PM MDTSpecial Weather StatementGJT39 min
Sep 27, 11:48 PM MDTAreal Flood WarningSLC6 hr
Sep 29, 2:21 PM MDTAreal Flood AdvisoryGJT3 hr
Oct 11, 9:55 PM MDTWind AdvisoryGJT21 hr
Oct 27, 12:43 PM MDTFreeze WarningGJT20 hr
Nov 1, 3:30 AM MDTWinter Storm WatchGJT12 hr
Nov 1, 3:36 PM MDTWinter Storm WarningGJT46 hr
Nov 2, 2:06 AM MSTFreeze WatchGJT13 hr
Nov 2, 2:55 PM MSTFreeze WarningGJT42 hr
Nov 12, 3:09 PM MSTWinter Storm WarningGJT4 days
Nov 15, 2:49 PM MSTFreeze WarningGJT18 hr
Dec 5, 2:30 AM MSTDense Fog AdvisoryGJT6 hr
Dec 10, 7:19 PM MSTDense Fog AdvisoryGJT13 hr
Dec 12, 3:36 PM MSTWinter Weather AdvisoryGJT62 hr
Dec 14, 1:23 AM MSTDense Fog AdvisoryGJT6 hr
Dec 24, 3:13 PM MSTWinter Weather AdvisoryGJT57 hr
Dec 30, 3:21 AM MSTWinter Storm WatchGJT10 hr
Dec 30, 1:37 PM MSTWinter Storm WarningGJT58 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 archive20132015

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.