Alert archive / Montana / Valley County

Weather alerts in Valley County, Montana, 2013

260 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Valley County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts
260
Warnings
80
Watches
19
Advisories
100
Busiest month
July50 alerts
Busiest day
July 24, 201316 alerts

Over time

By month

Warning verification

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

Valley County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings493235%3786%25 min
Flash flood warnings80100%10%

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Glasgow, MT: tornado warnings8450%5100%12 min
NWS Glasgow, MT: severe thunderstorm warnings1478443%19676%27 min
NWS Glasgow, MT: flash flood warnings21386%560%36 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
Dec 31, 9:22 PM MSTDense Fog AdvisoryGGW9 hr
Jan 9, 2:41 AM MSTWinter Storm WatchGGW25 hr
Jan 9, 2:45 PM MSTWinter Storm WarningGGW60 hr
Jan 11, 11:44 AM MSTBlizzard WarningGGW15 hr
Jan 11, 11:20 PM MSTWind Chill AdvisoryGGW12 hr
Jan 14, 2:33 PM MSTWinter Weather AdvisoryGGW23 hr
Jan 19, 3:17 AM MSTWind Chill AdvisoryGGW51 hr
Jan 23, 8:57 PM MSTWind Chill AdvisoryGGW6 hr
Jan 25, 2:30 PM MSTFreezing Rain AdvisoryGGW13 hr
Jan 26, 3:17 AM MSTFreezing Rain AdvisoryGGW31 hr
Jan 27, 8:42 AM MSTDense Fog AdvisoryGGW3 hr
Jan 28, 2:37 PM MSTWind Chill AdvisoryGGW37 hr
Jan 30, 4:08 AM MSTWind Chill WarningGGW30 hr
Feb 2, 8:59 AM MSTWinter Weather AdvisoryGGW8 hr
Feb 7, 1:20 AM MSTDense Fog AdvisoryGGW13 hr
Feb 18, 2:26 PM MSTWind Chill AdvisoryGGW37 hr
Mar 3, 4:02 AM MSTWinter Storm WarningGGW40 hr
Mar 3, 4:02 AM MSTWinter Weather AdvisoryGGW34 hr
Mar 14, 3:22 AM MDTWinter Weather AdvisoryGGW34 hr
Mar 14, 3:22 AM MDTFreezing Rain AdvisoryGGW30 hr
Mar 15, 9:46 AM MDTDense Fog AdvisoryGGW3 hr
Mar 15, 2:22 PM MDTWinter Storm WatchGGW24 hr
Mar 16, 2:47 PM MDTWinter Storm WarningGGW36 hr
Mar 18, 2:34 AM MDTWind Chill AdvisoryGGW8 hr
Mar 20, 2:33 PM MDTWinter Weather AdvisoryGGW51 hr
Mar 29, 5:38 AM MDTFreezing Rain AdvisoryGGW6 hr
Mar 30, 7:56 AM MDTAreal Flood AdvisoryGGW3 days
Apr 4, 2:33 PM MDTFreezing Rain AdvisoryGGW18 hr
Apr 6, 2:49 AM MDTFreezing Rain AdvisoryGGW31 hr
Apr 7, 7:26 AM MDTDense Fog AdvisoryGGW3 hr
Apr 7, 2:44 PM MDTWinter Weather AdvisoryGGW23 hr
Apr 12, 3:34 AM MDTWinter Storm WatchGGW24 hr
Apr 13, 3:37 AM MDTWinter Storm WarningGGW48 hr
Apr 16, 7:39 AM MDTWinter Weather AdvisoryGGW4 hr
Apr 19, 2:52 PM MDTWinter Weather AdvisoryGGW13 hr
Apr 20, 6:18 PM MDTSpecial Weather StatementGGW42 min
Apr 20, 7:21 PM MDTSpecial Weather StatementGGW39 min
Apr 20, 7:25 PM MDTSpecial Weather StatementGGW50 min
Apr 20, 7:45 PM MDTSpecial Weather StatementGGW60 min
Apr 27, 2:50 AM MDTLake Wind AdvisoryGGW19 hr
Apr 28, 2:42 PM MDTLake Wind AdvisoryGGW54 hr
Apr 29, 8:03 AM MDTRed Flag WarningGGW13 hr
Apr 29, 3:17 PM MDTSpecial Weather StatementGGW58 min
Apr 29, 3:30 PM MDTSevere Thunderstorm WarningGGW60 min
Apr 29, 5:51 PM MDTSpecial Weather StatementGGW54 min
May 7, 8:34 PM MDTLake Wind AdvisoryGGW6 hr
May 9, 2:56 PM MDTLake Wind AdvisoryGGW30 hr
May 9, 3:40 PM MDTFire Weather WatchGGW12 hr
May 10, 3:29 AM MDTRed Flag WarningGGW15 hr
May 11, 2:18 PM MDTFire Weather WatchGGW37 hr
May 12, 2:08 PM MDTFire Weather WatchGGW25 hr
May 13, 1:35 PM MDTLake Wind AdvisoryGGW29 hr
May 13, 2:46 PM MDTRed Flag WarningGGW28 hr
May 13, 6:18 PM MDTMesoscale DiscussionSPC87 min
May 13, 7:25 PM MDTSpecial Weather StatementGGW65 min
May 13, 7:40 PM MDTSevere Thunderstorm WarningGGW65 min
May 13, 10:37 PM MDTSpecial Weather StatementGGW53 min
May 20, 2:52 AM MDTLake Wind AdvisoryGGW16 hr
May 21, 2:06 PM MDTLake Wind AdvisoryGGW67 hr
May 25, 5:16 PM MDTSpecial Weather StatementGGW29 min
May 25, 5:33 PM MDTSevere Thunderstorm WarningGGW42 min
May 25, 6:09 PM MDTSevere Thunderstorm WarningGGW66 min
May 25, 6:14 PM MDTSevere Thunderstorm WarningGGW61 min
May 25, 6:40 PM MDTSpecial Weather StatementGGW65 min
May 25, 7:12 PM MDTSevere Thunderstorm WarningGGW63 min
May 25, 7:22 PM MDTSpecial Weather StatementGGW23 min
May 25, 7:33 PM MDTFlash Flood WarningGGW3 hr
May 25, 7:39 PM MDTFlash Flood WarningGGW3 hr
May 25, 8:13 PM MDTFlash Flood WarningGGW3 hr
May 26, 6:18 PM MDTSevere Thunderstorm WarningGGW57 min
May 26, 8:09 PM MDTAreal Flood AdvisoryGGW3 hr
May 26, 8:18 PM MDTSpecial Weather StatementGGW57 min
May 26, 8:35 PM MDTSevere Thunderstorm WarningGGW40 min
May 27, 7:01 PM MDTAreal Flood AdvisoryGGW3 hr
May 29, 3:24 AM MDTFlood WatchGGW58 hr
May 31, 3:32 AM MDTLake Wind AdvisoryGGW17 hr
May 31, 4:59 AM MDTAreal Flood AdvisoryGGW24 hr
Jun 2, 8:16 AM MDTAreal Flood WarningGGW48 hr
Jun 2, 2:37 PM MDTFlood WatchGGW37 hr
Jun 3, 7:28 AM MDTAreal Flood AdvisoryGGW24 hr
Jun 3, 7:46 AM MDTLake Wind AdvisoryGGW19 hr
Jun 3, 2:08 PM MDTAreal Flood WarningGGW12 hr
Jun 3, 8:26 PM MDTAreal Flood WarningGGW17 hr
Jun 4, 3:33 AM MDTRiver Flood WarningGGW14 days
Jun 4, 3:36 PM MDTRiver Flood WarningGGW63 hr
Jun 5, 3:01 PM MDTRiver Flood WarningGGW8 days
Jun 6, 1:23 PM MDTRiver Flood WarningGGW49 hr
Jun 7, 2:52 PM MDTLake Wind AdvisoryGGW30 hr
Jun 7, 7:13 PM MDTSevere Thunderstorm WarningGGW47 min
Jun 7, 7:59 PM MDTSpecial Weather StatementGGW46 min
Jun 7, 10:24 PM MDTAreal Flood WarningGGW12 hr
Jun 8, 9:55 AM MDTAreal Flood WarningGGW24 hr
Jun 9, 9:30 AM MDTAreal Flood WarningGGW27 hr
Jun 10, 12:24 PM MDTAreal Flood AdvisoryGGW45 hr
Jun 11, 9:35 AM MDTLake Wind AdvisoryGGW13 hr
Jun 11, 12:05 PM MDTMesoscale DiscussionSPC85 min
Jun 13, 3:04 AM MDTLake Wind AdvisoryGGW13 hr
Jun 13, 1:06 PM MDTSevere Thunderstorm WatchSPC12 hr
Jun 13, 1:42 PM MDTFlash Flood WatchGGW13 hr
Jun 13, 8:06 PM MDTMesoscale DiscussionSPC54 min
Jun 14, 2:45 AM MDTLake Wind AdvisoryGGW18 hr
Jun 14, 12:42 PM MDTSpecial Weather StatementGGW48 min
Jun 15, 3:08 AM MDTLake Wind AdvisoryGGW17 hr
Jun 16, 10:40 AM MDTLake Wind AdvisoryGGW9 hr
Jun 18, 9:46 AM MDTLake Wind AdvisoryGGW41 hr
Jun 19, 8:25 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 19, 10:10 PM MDTSevere Thunderstorm WarningGGW65 min
Jun 19, 10:44 PM MDTSevere Thunderstorm WarningGGW61 min
Jun 19, 10:49 PM MDTMesoscale DiscussionSPC86 min
Jun 19, 10:52 PM MDTSevere Thunderstorm WarningGGW53 min
Jun 19, 11:42 PM MDTSevere Thunderstorm WarningGGW63 min
Jun 19, 11:44 PM MDTSevere Thunderstorm WarningGGW61 min
Jun 24, 6:39 PM MDTMesoscale DiscussionSPC96 min
Jun 24, 7:01 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 24, 9:47 PM MDTMesoscale DiscussionSPC58 min
Jun 24, 9:54 PM MDTSevere Thunderstorm WarningGGW66 min
Jun 24, 10:56 PM MDTSevere Thunderstorm WarningGGW64 min
Jun 24, 11:53 PM MDTSpecial Weather StatementGGW67 min
Jun 25, 12:00 AM MDTSpecial Weather StatementGGW45 min
Jun 25, 12:25 AM MDTFlash Flood WarningGGW3 hr
Jun 25, 1:01 AM MDTSpecial Weather StatementGGW59 min
Jun 25, 1:06 AM MDTMesoscale DiscussionSPC54 min
Jun 25, 1:42 AM MDTFlash Flood WarningGGW3 hr
Jun 25, 3:27 AM MDTAreal Flood AdvisoryGGW6 hr
Jun 26, 3:01 AM MDTLake Wind AdvisoryGGW18 hr
Jul 3, 3:54 PM MDTMesoscale DiscussionSPC96 min
Jul 3, 4:22 PM MDTLake Wind AdvisoryGGW4 hr
Jul 5, 7:01 AM MDTSpecial Weather StatementGGW59 min
Jul 5, 8:03 AM MDTSpecial Weather StatementGGW57 min
Jul 5, 9:19 AM MDTSpecial Weather StatementGGW56 min
Jul 6, 3:09 AM MDTSpecial Weather StatementGGW66 min
Jul 6, 4:20 AM MDTSpecial Weather StatementGGW55 min
Jul 6, 12:01 PM MDTLake Wind AdvisoryGGW8 hr
Jul 7, 8:10 PM MDTSevere Thunderstorm WarningGGW50 min
Jul 7, 8:54 PM MDTSpecial Weather StatementGGW66 min
Jul 7, 9:13 PM MDTSevere Thunderstorm WarningGGW62 min
Jul 7, 10:12 PM MDTSevere Thunderstorm WarningGGW48 min
Jul 7, 10:55 PM MDTSpecial Weather StatementGGW65 min
Jul 8, 12:54 PM MDTMesoscale DiscussionSPC66 min
Jul 8, 1:17 PM MDTSevere Thunderstorm WarningGGW58 min
Jul 8, 1:23 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 8, 2:10 PM MDTSevere Thunderstorm WarningGGW65 min
Jul 8, 4:58 PM MDTMesoscale DiscussionSPC2 hr
Jul 13, 3:05 AM MDTLake Wind AdvisoryGGW18 hr
Jul 15, 1:51 PM MDTMesoscale DiscussionSPC84 min
Jul 15, 3:14 PM MDTSevere Thunderstorm WarningGGW61 min
Jul 17, 2:47 PM MDTLake Wind AdvisoryGGW30 hr
Jul 20, 2:34 PM MDTLake Wind AdvisoryGGW30 hr
Jul 20, 3:54 PM MDTSpecial Weather StatementGGW66 min
Jul 20, 4:02 PM MDTSevere Thunderstorm WarningGGW58 min
Jul 20, 4:44 PM MDTMesoscale DiscussionSPC91 min
Jul 20, 4:57 PM MDTSevere Thunderstorm WarningGGW63 min
Jul 22, 6:27 PM MDTSevere Thunderstorm WarningGGW63 min
Jul 22, 8:00 PM MDTSevere Thunderstorm WarningGGW45 min
Jul 24, 1:21 PM MDTMesoscale DiscussionSPC84 min
Jul 24, 1:53 PM MDTSpecial Weather StatementGGW67 min
Jul 24, 2:04 PM MDTSpecial Weather StatementGGW56 min
Jul 24, 2:39 PM MDTSevere Thunderstorm WarningGGW51 min
Jul 24, 2:58 PM MDTSevere Thunderstorm WarningGGW32 min
Jul 24, 3:28 PM MDTSevere Thunderstorm WarningGGW62 min
Jul 24, 4:08 PM MDTSpecial Weather StatementGGW67 min
Jul 24, 4:15 PM MDTSevere Thunderstorm WarningGGW60 min
Jul 24, 4:22 PM MDTSevere Thunderstorm WarningGGW53 min
Jul 24, 4:44 PM MDTSevere Thunderstorm WarningGGW61 min
Jul 24, 4:51 PM MDTSevere Thunderstorm WarningGGW54 min
Jul 24, 5:08 PM MDTMesoscale DiscussionSPC97 min
Jul 24, 5:18 PM MDTSpecial Weather StatementGGW57 min
Jul 24, 5:26 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 24, 5:29 PM MDTSevere Thunderstorm WarningGGW61 min
Jul 24, 5:39 PM MDTSevere Thunderstorm WarningGGW66 min
Jul 24, 6:26 PM MDTSevere Thunderstorm WarningGGW64 min
Jul 24, 7:48 PM MDTMesoscale DiscussionSPC87 min
Jul 26, 2:28 PM MDTLake Wind AdvisoryGGW31 hr
Jul 28, 3:56 PM MDTMesoscale DiscussionSPC3 hr
Jul 30, 2:27 AM MDTSpecial Weather StatementGGW63 min
Aug 3, 1:17 PM MDTMesoscale DiscussionSPC118 min
Aug 3, 1:50 PM MDTSevere Thunderstorm WatchSPC9 hr
Aug 3, 4:01 PM MDTSevere Thunderstorm WarningGGW59 min
Aug 3, 4:58 PM MDTSevere Thunderstorm WarningGGW62 min
Aug 3, 5:13 PM MDTSpecial Weather StatementGGW62 min
Aug 3, 5:33 PM MDTSpecial Weather StatementGGW57 min
Aug 3, 5:34 PM MDTSevere Thunderstorm WarningGGW41 min
Aug 3, 5:44 PM MDTMesoscale DiscussionSPC61 min
Aug 4, 3:17 PM MDTSpecial Weather StatementGGW58 min
Aug 5, 3:15 PM MDTSpecial Weather StatementGGW60 min
Aug 5, 3:25 PM MDTSevere Thunderstorm WarningGGW65 min
Aug 5, 3:50 PM MDTSevere Thunderstorm WarningGGW55 min
Aug 5, 3:58 PM MDTSevere Thunderstorm WarningGGW62 min
Aug 5, 4:17 PM MDTSevere Thunderstorm WarningGGW58 min
Aug 5, 4:22 PM MDTSevere Thunderstorm WarningGGW53 min
Aug 5, 5:07 PM MDTMesoscale DiscussionSPC53 min
Aug 5, 5:09 PM MDTSevere Thunderstorm WarningGGW66 min
Aug 5, 5:38 PM MDTSevere Thunderstorm WarningGGW67 min
Aug 10, 2:04 PM MDTSpecial Weather StatementGGW56 min
Aug 10, 2:32 PM MDTSevere Thunderstorm WarningGGW58 min
Aug 10, 2:48 PM MDTMesoscale DiscussionSPC87 min
Aug 10, 3:41 PM MDTSpecial Weather StatementGGW64 min
Aug 10, 3:52 PM MDTSevere Thunderstorm WarningGGW53 min
Aug 21, 9:39 AM MDTLake Wind AdvisoryGGW5 hr
Aug 22, 8:43 AM MDTLake Wind AdvisoryGGW6 hr
Aug 28, 2:54 PM MDTMesoscale DiscussionSPC96 min
Aug 28, 4:23 PM MDTSevere Thunderstorm WatchSPC8 hr
Aug 28, 6:43 PM MDTSpecial Weather StatementGGW62 min
Aug 28, 7:43 PM MDTSpecial Weather StatementGGW62 min
Aug 28, 9:28 PM MDTSevere Thunderstorm WarningGGW62 min
Aug 30, 2:16 PM MDTLake Wind AdvisoryGGW29 hr
Sep 1, 6:27 AM MDTDense Fog AdvisoryGGW3 hr
Sep 5, 9:29 PM MDTSpecial Weather StatementGGW61 min
Sep 5, 10:26 PM MDTSpecial Weather StatementGGW64 min
Sep 7, 3:46 AM MDTLake Wind AdvisoryGGW16 hr
Sep 7, 7:02 AM MDTFlash Flood WarningGGW118 min
Sep 7, 7:35 AM MDTFlash Flood WarningGGW85 min
Sep 7, 8:07 AM MDTFlash Flood WarningGGW3 hr
Sep 7, 9:07 AM MDTFlash Flood WatchGGW37 hr
Sep 7, 10:54 AM MDTAreal Flood WarningGGW10 hr
Sep 8, 1:40 PM MDTSevere Thunderstorm WatchSPC7 hr
Sep 13, 2:11 PM MDTLake Wind AdvisoryGGW30 hr
Sep 16, 2:59 AM MDTLake Wind AdvisoryGGW15 hr
Sep 18, 2:21 PM MDTLake Wind AdvisoryGGW28 hr
Sep 22, 12:53 PM MDTLake Wind AdvisoryGGW4 hr
Sep 22, 9:16 PM MDTLake Wind AdvisoryGGW23 hr
Sep 25, 2:45 PM MDTLake Wind AdvisoryGGW30 hr
Sep 28, 3:30 AM MDTLake Wind AdvisoryGGW16 hr
Sep 28, 2:50 PM MDTLake Wind AdvisoryGGW29 hr
Sep 29, 2:51 PM MDTLake Wind AdvisoryGGW51 hr
Oct 3, 3:09 AM MDTLake Wind AdvisoryGGW11 hr
Oct 7, 2:33 PM MDTLake Wind AdvisoryGGW24 hr
Oct 11, 3:30 AM MDTLake Wind AdvisoryGGW17 hr
Oct 14, 11:39 AM MDTLake Wind AdvisoryGGW7 hr
Oct 18, 3:13 AM MDTLake Wind AdvisoryGGW13 hr
Oct 19, 12:30 AM MDTLake Wind AdvisoryGGW30 hr
Oct 21, 3:07 AM MDTLake Wind AdvisoryGGW17 hr
Oct 25, 3:28 AM MDTLake Wind AdvisoryGGW17 hr
Oct 26, 2:30 PM MDTLake Wind AdvisoryGGW52 hr
Oct 31, 2:55 AM MDTLake Wind AdvisoryGGW39 hr
Nov 2, 2:27 PM MDTLake Wind AdvisoryGGW52 hr
Nov 7, 2:35 PM MSTLake Wind AdvisoryGGW29 hr
Nov 9, 2:47 PM MSTWinter Weather AdvisoryGGW42 hr
Nov 16, 2:56 PM MSTLake Wind AdvisoryGGW18 hr
Nov 30, 2:01 AM MSTFreezing Rain AdvisoryGGW9 hr
Nov 30, 6:57 PM MSTFreezing Rain AdvisoryGGW13 hr
Dec 1, 2:54 AM MSTWinter Storm WatchGGW24 hr
Dec 1, 2:59 PM MSTFreezing Rain AdvisoryGGW20 hr
Dec 2, 3:06 AM MSTWinter Storm WarningGGW49 hr
Dec 3, 9:52 AM MSTWinter Weather AdvisoryGGW11 hr
Dec 3, 9:18 PM MSTWind Chill AdvisoryGGW46 hr
Dec 4, 10:57 AM MSTWind Chill AdvisoryGGW33 hr
Dec 6, 3:07 AM MSTWind Chill AdvisoryGGW40 hr
Dec 6, 2:09 PM MSTWind Chill WarningGGW21 hr
Dec 7, 11:01 AM MSTWind Chill WarningGGW23 hr
Dec 7, 11:01 AM MSTWind Chill AdvisoryGGW48 hr
Dec 8, 2:15 PM MSTWinter Weather AdvisoryGGW30 hr
Dec 10, 7:48 PM MSTWind Chill AdvisoryGGW16 hr
Dec 18, 3:37 AM MSTWind Chill AdvisoryGGW31 hr
Dec 18, 3:37 AM MSTWinter Weather AdvisoryGGW34 hr
Dec 20, 2:25 PM MSTWinter Weather AdvisoryGGW30 hr
Dec 22, 2:30 PM MSTWinter Weather AdvisoryGGW36 hr
Dec 27, 3:01 PM MSTWind Chill AdvisoryGGW36 hr
Dec 28, 9:42 AM MSTWinter Weather AdvisoryGGW5 hr
Dec 30, 3:20 AM MSTWinter Weather AdvisoryGGW55 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 archive20122014

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.