Alert archive / Montana / Prairie County

Weather alerts in Prairie County, Montana, 2011

150 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Prairie County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts
150
Warnings
44
Watches
35
Advisories
35
Busiest month
July36 alerts
Busiest day
July 22, 20119 alerts

Over time

By month

Warning verification

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

Prairie County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings16944%757%34 min
Flash flood warnings3167%10%

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Glasgow, MT: tornado warnings12375%2100%22 min
NWS Glasgow, MT: severe thunderstorm warnings1738153%17078%27 min
NWS Glasgow, MT: flash flood warnings291066%2572%93 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, 9:20 PM MSTWind Chill AdvisoryGGW16 hr
Jan 2, 11:13 AM MSTWinter Weather AdvisoryGGW17 hr
Jan 6, 3:05 PM MSTWinter Storm WatchGGW24 hr
Jan 7, 3:20 PM MSTWinter Weather AdvisoryGGW43 hr
Jan 9, 3:00 PM MSTWind Chill AdvisoryGGW19 hr
Jan 10, 3:13 PM MSTWind Chill AdvisoryGGW18 hr
Jan 14, 3:49 AM MSTWinter Weather AdvisoryGGW24 hr
Jan 16, 3:17 AM MSTFreezing Rain AdvisoryGGW23 hr
Jan 17, 7:24 PM MSTWinter Weather AdvisoryGGW17 hr
Jan 19, 3:04 PM MSTWind Chill AdvisoryGGW12 hr
Jan 20, 3:07 PM MSTWinter Storm WatchGGW13 hr
Jan 21, 3:56 AM MSTWinter Weather AdvisoryGGW32 hr
Jan 22, 7:40 AM MSTBlizzard WarningGGW4 hr
Jan 22, 10:06 AM MSTWinter Weather AdvisoryGGW3 hr
Jan 29, 12:33 AM MSTWinter Weather AdvisoryGGW6 hr
Jan 29, 9:26 AM MSTWinter Weather AdvisoryGGW36 hr
Jan 30, 2:32 PM MSTWind Chill AdvisoryGGW44 hr
Jan 31, 2:53 PM MSTWind Chill WarningGGW20 hr
Feb 1, 11:11 AM MSTWind Chill AdvisoryGGW24 hr
Feb 4, 2:30 PM MSTWinter Weather AdvisoryGGW29 hr
Feb 6, 3:21 PM MSTWind Chill AdvisoryGGW43 hr
Feb 8, 2:28 PM MSTWind Chill AdvisoryGGW20 hr
Feb 10, 3:26 AM MSTWinter Weather AdvisoryGGW31 hr
Feb 11, 2:56 PM MSTHigh Wind WarningGGW47 hr
Feb 12, 3:00 PM MSTHigh Wind WatchGGW12 hr
Feb 13, 2:01 PM MSTHigh Wind WarningGGW4 hr
Feb 16, 3:16 PM MSTWinter Weather AdvisoryGGW23 hr
Feb 18, 2:29 PM MSTWinter Storm WatchGGW24 hr
Feb 19, 2:30 PM MSTWinter Storm WarningGGW27 hr
Feb 23, 3:23 AM MSTWind Chill AdvisoryGGW57 hr
Feb 25, 2:31 PM MSTWind Chill AdvisoryGGW22 hr
Feb 28, 2:53 PM MSTWinter Weather AdvisoryGGW20 hr
Mar 1, 11:00 AM MSTWind Chill AdvisoryGGW27 hr
Mar 14, 4:34 AM MDTFlood WatchGGW3 days
Mar 16, 11:54 AM MDTAreal Flood WarningGGW72 hr
Mar 19, 12:31 PM MDTAreal Flood WarningGGW49 hr
Mar 21, 3:50 PM MDTWinter Weather AdvisoryGGW46 hr
Apr 1, 3:50 AM MDTWinter Storm WatchGGW24 hr
Apr 17, 3:09 PM MDTWinter Storm WatchGGW24 hr
Apr 18, 3:03 PM MDTWinter Weather AdvisoryGGW29 hr
Apr 22, 4:07 AM MDTWinter Weather AdvisoryGGW11 hr
Apr 29, 3:16 PM MDTWinter Weather AdvisoryGGW12 hr
Apr 30, 10:34 AM MDTHigh Wind WarningGGW7 hr
May 9, 8:39 PM MDTFlood WatchGGW23 hr
May 10, 8:31 AM MDTAreal Flood AdvisoryGGW23 hr
May 17, 9:01 AM MDTFlood WatchGGW3 hr
May 17, 11:53 AM MDTAreal Flood WarningGGW48 hr
May 18, 2:47 PM MDTFlood WatchGGW44 hr
May 20, 10:06 AM MDTAreal Flood WarningGGW67 hr
May 20, 8:50 PM MDTSpecial Weather StatementGGW55 min
May 20, 9:51 PM MDTSpecial Weather StatementGGW54 min
May 23, 4:29 AM MDTAreal Flood WarningGGW3 days
May 27, 3:24 AM MDTFlood WatchGGW4 days
May 30, 12:55 AM MDTAreal Flood WarningGGW36 hr
May 30, 2:51 AM MDTHigh Wind WatchGGW18 hr
Jun 2, 1:54 PM MDTMesoscale DiscussionSPC66 min
Jun 2, 2:09 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 2, 3:49 PM MDTSevere Thunderstorm WarningGGW29 min
Jun 2, 4:46 PM MDTSevere Thunderstorm WarningGGW24 min
Jun 6, 10:25 PM MDTMesoscale DiscussionSPC95 min
Jun 12, 9:44 AM MDTFlash Flood WatchGGW11 hr
Jun 12, 12:52 PM MDTMesoscale DiscussionSPC53 min
Jun 13, 2:35 PM MDTFlash Flood WatchGGW21 hr
Jun 13, 10:55 PM MDTSpecial Weather StatementGGW65 min
Jun 13, 11:46 PM MDTFlash Flood WarningGGW4 hr
Jun 14, 3:53 AM MDTAreal Flood WarningGGW8 hr
Jun 15, 10:21 PM MDTSevere Thunderstorm WarningGGW39 min
Jun 15, 10:56 PM MDTSevere Thunderstorm WarningGGW64 min
Jun 16, 3:37 AM MDTFlash Flood WatchGGW40 hr
Jun 18, 3:01 PM MDTFlash Flood WatchGGW36 hr
Jun 23, 2:57 PM MDTFlash Flood WatchGGW13 hr
Jun 29, 6:17 PM MDTMesoscale DiscussionSPC118 min
Jul 2, 12:17 PM MDTMesoscale DiscussionSPC58 min
Jul 3, 12:31 PM MDTMesoscale DiscussionSPC2 hr
Jul 3, 4:08 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 3, 6:29 PM MDTMesoscale DiscussionSPC2 hr
Jul 3, 8:02 PM MDTMesoscale DiscussionSPC58 min
Jul 3, 9:53 PM MDTSpecial Weather StatementGGW67 min
Jul 3, 10:30 PM MDTMesoscale DiscussionSPC90 min
Jul 3, 11:00 PM MDTSpecial Weather StatementGGW60 min
Jul 5, 9:02 PM MDTSevere Thunderstorm WarningGGW48 min
Jul 13, 9:45 PM MDTSpecial Weather StatementBYZ60 min
Jul 14, 1:56 PM MDTSevere Thunderstorm WatchSPC9 hr
Jul 14, 6:33 PM MDTMesoscale DiscussionSPC57 min
Jul 14, 7:58 PM MDTSevere Thunderstorm WarningGGW62 min
Jul 14, 9:33 PM MDTSevere Thunderstorm WarningGGW57 min
Jul 15, 6:26 PM MDTMesoscale DiscussionSPC64 min
Jul 15, 9:40 PM MDTFlash Flood WarningGGW4 hr
Jul 18, 9:01 AM MDTHeat AdvisoryGGW35 hr
Jul 22, 10:05 AM MDTMesoscale DiscussionSPC55 min
Jul 22, 1:06 PM MDTMesoscale DiscussionSPC24 min
Jul 22, 1:25 PM MDTTornado WatchSPC8 hr
Jul 22, 3:30 PM MDTSevere Thunderstorm WarningGGW60 min
Jul 22, 4:17 PM MDTMesoscale DiscussionSPC88 min
Jul 22, 4:23 PM MDTSevere Thunderstorm WarningGGW67 min
Jul 22, 4:58 PM MDTSevere Thunderstorm WarningGGW32 min
Jul 22, 5:07 PM MDTFlash Flood WarningGGW2 hr
Jul 22, 5:12 PM MDTSevere Thunderstorm WarningGGW63 min
Jul 22, 6:15 PM MDTSevere Thunderstorm WarningGGW46 min
Jul 25, 5:15 PM MDTMesoscale DiscussionSPC2 hr
Jul 25, 5:47 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 25, 9:07 PM MDTMesoscale DiscussionSPC83 min
Jul 26, 1:07 PM MDTMesoscale DiscussionSPC53 min
Jul 26, 2:43 PM MDTSevere Thunderstorm WatchSPC5 hr
Jul 26, 6:05 PM MDTMesoscale DiscussionSPC85 min
Jul 26, 6:30 PM MDTSpecial Weather StatementGGW30 min
Jul 29, 4:46 PM MDTMesoscale DiscussionSPC59 min
Jul 29, 5:02 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 4, 2:24 PM MDTMesoscale DiscussionSPC96 min
Aug 4, 4:49 PM MDTSevere Thunderstorm WatchSPC5 hr
Aug 4, 7:36 PM MDTFlash Flood WatchGGW24 hr
Aug 5, 12:05 PM MDTMesoscale DiscussionSPC2 hr
Aug 5, 3:05 PM MDTSpecial Weather StatementGGW25 min
Aug 5, 3:29 PM MDTSevere Thunderstorm WarningGGW31 min
Aug 5, 4:25 PM MDTMesoscale DiscussionSPC2 hr
Aug 11, 3:40 PM MDTMesoscale DiscussionSPC95 min
Aug 11, 3:59 PM MDTSpecial Weather StatementGGW31 min
Aug 11, 4:06 PM MDTSevere Thunderstorm WarningGGW39 min
Aug 11, 5:04 PM MDTSevere Thunderstorm WarningGGW56 min
Aug 14, 5:56 PM MDTMesoscale DiscussionSPC94 min
Aug 15, 4:23 PM MDTSevere Thunderstorm WatchSPC9 hr
Aug 15, 8:37 PM MDTMesoscale DiscussionSPC83 min
Aug 21, 3:39 AM MDTFire Weather WatchGGW23 hr
Aug 21, 8:30 PM MDTSpecial Weather StatementBYZ60 min
Aug 22, 2:53 AM MDTRed Flag WarningGGW17 hr
Aug 23, 2:48 AM MDTRed Flag WarningGGW18 hr
Aug 24, 2:11 PM MDTFire Weather WatchGGW13 hr
Aug 25, 3:35 AM MDTRed Flag WarningGGW17 hr
Aug 31, 9:05 PM MDTSevere Thunderstorm WarningGGW55 min
Sep 19, 1:15 PM MDTMesoscale DiscussionSPC2 hr
Sep 27, 2:49 PM MDTRed Flag WarningGGW29 hr
Sep 30, 2:19 PM MDTFire Weather WatchGGW13 hr
Oct 1, 3:41 AM MDTRed Flag WarningGGW23 hr
Oct 3, 2:42 PM MDTRed Flag WarningGGW29 hr
Oct 6, 2:57 PM MDTHigh Wind WatchGGW13 hr
Oct 7, 4:23 AM MDTHigh Wind WarningGGW13 hr
Nov 2, 12:29 PM MDTFire Weather WatchGGW15 hr
Nov 3, 3:23 AM MDTRed Flag WarningGGW14 hr
Nov 3, 2:37 PM MDTWinter Storm WatchGGW37 hr
Nov 5, 3:41 AM MDTWinter Storm WarningGGW24 hr
Nov 18, 3:03 PM MSTWinter Weather AdvisoryGGW24 hr
Nov 29, 2:33 PM MSTWinter Weather AdvisoryGGW37 hr
Dec 3, 3:18 AM MSTWinter Weather AdvisoryGGW38 hr
Dec 12, 9:27 PM MSTDense Fog AdvisoryGGW35 hr
Dec 21, 1:49 AM MSTWinter Weather AdvisoryGGW13 hr
Dec 26, 2:41 AM MSTHigh Wind WarningGGW12 hr
Dec 28, 3:38 AM MSTHigh Wind WatchGGW24 hr
Dec 29, 4:05 AM MSTHigh Wind WarningGGW19 hr
Dec 30, 3:23 AM MSTHigh Wind WatchGGW23 hr
Dec 31, 2:45 AM MSTHigh Wind WarningGGW12 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 archive20102012

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.