Alert archive / Montana / Madison County

Weather alerts in Madison County, Montana, 2008

63 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Madison County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts
63
Warnings
36
Watches
12
Advisories
3
Busiest month
August32 alerts
Busiest day
August 9, 20089 alerts

Over time

By month

Warning verification

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

Madison County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings161131%1369%15 min
Flash flood warnings3167%0

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Great Falls, MT: tornado warnings70100%30%
NWS Great Falls, MT: severe thunderstorm warnings1417448%14172%19 min
NWS Great Falls, MT: flash flood warnings3167%333%3 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
May 20, 6:43 PM MDTSevere Thunderstorm WarningTFX47 min
May 21, 2:31 PM MDTRiver Flood WarningTFX18 hr
May 22, 11:43 AM MDTRiver Flood WarningTFX4 days
May 23, 10:46 AM MDTRiver Flood WarningTFX3 days
Jun 2, 1:19 PM MDTMesoscale DiscussionSPC86 min
Jun 10, 9:54 AM MDTMesoscale DiscussionSPC66 min
Jun 12, 8:18 PM MDTAreal Flood AdvisoryTFX16 hr
Jun 13, 12:09 PM MDTAreal Flood AdvisoryTFX24 hr
Jun 16, 2:14 PM MDTAreal Flood AdvisoryTFX14 days
Jun 17, 2:09 PM MDTMesoscale DiscussionSPC66 min
Jun 17, 5:48 PM MDTSevere Thunderstorm WatchSPC9 hr
Jun 21, 6:09 PM MDTSevere Thunderstorm WarningTFX51 min
Jun 22, 4:31 PM MDTSevere Thunderstorm WarningTFX89 min
Jul 1, 1:26 PM MDTMesoscale DiscussionSPC2 hr
Jul 1, 1:34 PM MDTSevere Thunderstorm WarningTFX41 min
Jul 1, 2:19 PM MDTSevere Thunderstorm WarningTFX41 min
Jul 4, 1:45 PM MDTMesoscale DiscussionSPC60 min
Jul 4, 2:04 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 4, 5:45 PM MDTMesoscale DiscussionSPC60 min
Jul 4, 8:36 PM MDTMesoscale DiscussionSPC54 min
Jul 9, 1:56 PM MDTFire Weather WatchMSO14 hr
Jul 10, 4:01 AM MDTRed Flag WarningMSO18 hr
Jul 22, 1:00 PM MDTSevere Thunderstorm WatchSPC8 hr
Jul 22, 3:38 PM MDTSevere Thunderstorm WarningTFX67 min
Jul 22, 4:32 PM MDTFlash Flood WarningTFX118 min
Jul 22, 4:53 PM MDTSevere Thunderstorm WarningTFX67 min
Jul 22, 5:04 PM MDTFlash Flood WarningTFX3 hr
Jul 22, 6:20 PM MDTMesoscale DiscussionSPC55 min
Jul 22, 6:29 PM MDTFlash Flood WarningTFX2 hr
Jul 30, 8:24 AM MDTRed Flag WarningMSO13 hr
Jul 31, 3:11 PM MDTFire Weather WatchBYZ14 hr
Aug 1, 3:43 AM MDTRed Flag WarningMSO17 hr
Aug 1, 5:07 AM MDTRed Flag WarningBYZ19 hr
Aug 2, 4:47 PM MDTMesoscale DiscussionSPC58 min
Aug 5, 2:32 PM MDTFire Weather WatchMSO41 hr
Aug 7, 3:45 AM MDTRed Flag WarningMSO29 hr
Aug 8, 2:52 PM MDTSevere Thunderstorm WarningTFX53 min
Aug 8, 3:43 PM MDTSevere Thunderstorm WarningTFX47 min
Aug 9, 11:46 AM MDTMesoscale DiscussionSPC59 min
Aug 9, 12:16 PM MDTSevere Thunderstorm WatchSPC8 hr
Aug 9, 12:40 PM MDTSevere Thunderstorm WarningTFX65 min
Aug 9, 1:15 PM MDTSevere Thunderstorm WarningTFX46 min
Aug 9, 2:34 PM MDTSevere Thunderstorm WarningTFX56 min
Aug 9, 3:59 PM MDTSevere Thunderstorm WarningTFX46 min
Aug 9, 4:44 PM MDTSevere Thunderstorm WarningTFX61 min
Aug 9, 5:50 PM MDTMesoscale DiscussionSPC55 min
Aug 9, 5:51 PM MDTSevere Thunderstorm WarningTFX39 min
Aug 9, 6:30 PM MDTSevere Thunderstorm WarningTFX60 min
Aug 17, 1:54 PM MDTRed Flag WarningMSO54 hr
Aug 18, 2:46 PM MDTFire Weather WatchMSO13 hr
Aug 19, 4:44 AM MDTRed Flag WarningBYZ16 hr
Aug 19, 12:43 PM MDTMesoscale DiscussionSPC92 min
Aug 21, 2:18 PM MDTRed Flag WarningMSO6 hr
Aug 24, 2:21 AM MDTFire Weather WatchBYZ25 hr
Aug 24, 4:33 AM MDTFire Weather WatchMSO16 hr
Aug 24, 4:42 PM MDTRed Flag WarningMSO4 hr
Aug 24, 8:47 PM MDTRed Flag WarningMSO26 hr
Aug 25, 3:31 AM MDTRed Flag WarningBYZ38 hr
Aug 27, 3:41 AM MDTRed Flag WarningBYZ17 hr
Aug 28, 2:58 PM MDTFire Weather WatchMSO24 hr
Aug 29, 4:26 AM MDTFire Weather WatchBYZ11 hr
Aug 29, 2:49 PM MDTRed Flag WarningMSO30 hr
Aug 29, 3:45 PM MDTRed Flag WarningBYZ29 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 archive20072009

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.