Alert archive / Montana / Carter County

Weather alerts in Carter County, Montana, 2009

111 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Carter County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
111
Warnings
32
Watches
22
Advisories
20
Busiest month
July26 alerts
Busiest day
July 8, 20098 alerts

Over time

By month

Warning verification

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

Carter County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings18667%863%17 min
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Billings, MT: severe thunderstorm warnings852867%6360%23 min
NWS Billings, MT: flash flood warnings8363%850%11 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 2, 8:56 PM MSTWind Chill AdvisoryBYZ21 hr
Jan 6, 3:37 PM MSTWinter Weather AdvisoryBYZ43 hr
Jan 8, 10:18 AM MSTFreezing Rain AdvisoryBYZ6 hr
Jan 9, 8:43 AM MSTWinter Weather AdvisoryBYZ5 hr
Jan 10, 3:37 PM MSTHigh Wind WatchBYZ24 hr
Jan 11, 3:58 PM MSTHigh Wind WarningBYZ18 hr
Feb 9, 2:39 AM MSTWinter Weather AdvisoryBYZ18 hr
Feb 19, 3:06 PM MSTWinter Weather AdvisoryBYZ23 hr
Feb 25, 3:43 AM MSTWinter Weather AdvisoryBYZ24 hr
Feb 26, 3:44 AM MSTWinter Storm WarningBYZ32 hr
Mar 8, 4:42 AM MDTWinter Storm WatchBYZ23 hr
Mar 8, 4:42 AM MDTWinter Storm WarningBYZ49 hr
Mar 21, 4:29 AM MDTBlizzard WatchBYZ35 hr
Mar 22, 3:58 PM MDTBlizzard WarningBYZ44 hr
Mar 23, 3:59 AM MDTMesoscale DiscussionSPC6 hr
Mar 23, 11:06 AM MDTMesoscale DiscussionSPC5 hr
Mar 23, 5:56 PM MDTMesoscale DiscussionSPC3 hr
Mar 27, 3:11 PM MDTWinter Storm WatchBYZ22 hr
Mar 28, 3:11 AM MDTBlizzard WatchBYZ25 hr
Mar 29, 3:48 AM MDTBlizzard WarningBYZ38 hr
Apr 2, 4:23 AM MDTWinter Storm WatchBYZ12 hr
Apr 2, 3:53 PM MDTWinter Storm WarningBYZ50 hr
Apr 2, 3:53 PM MDTWinter Weather AdvisoryBYZ42 hr
Apr 9, 3:50 PM MDTFlood WatchBYZ5 days
Apr 14, 11:06 AM MDTAreal Flood WarningBYZ5 days
Apr 25, 2:28 PM MDTWinter Weather AdvisoryBYZ37 hr
May 12, 2:11 PM MDTSevere Thunderstorm WarningBYZ64 min
May 12, 2:56 PM MDTSevere Thunderstorm WarningBYZ34 min
May 12, 4:01 PM MDTHigh Wind WatchBYZ12 hr
May 13, 3:56 AM MDTHigh Wind WarningBYZ13 hr
Jun 14, 2:22 PM MDTMesoscale DiscussionSPC83 min
Jun 14, 4:09 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 14, 4:21 PM MDTSpecial Weather StatementBYZ39 min
Jun 14, 4:47 PM MDTSevere Thunderstorm WarningBYZ58 min
Jun 14, 6:17 PM MDTMesoscale DiscussionSPC118 min
Jun 15, 2:54 PM MDTSpecial Weather StatementBYZ2 hr
Jun 15, 4:00 PM MDTSevere Thunderstorm WarningBYZ30 min
Jun 21, 7:09 PM MDTSpecial Weather StatementBYZ66 min
Jun 25, 3:49 PM MDTMesoscale DiscussionSPC56 min
Jun 27, 2:29 PM MDTSpecial Weather StatementBYZ31 min
Jun 30, 2:52 PM MDTMesoscale DiscussionSPC83 min
Jun 30, 3:19 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 3:28 PM MDTSpecial Weather StatementBYZ32 min
Jun 30, 3:34 PM MDTSevere Thunderstorm WarningBYZ49 min
Jun 30, 7:04 PM MDTSevere Thunderstorm WarningBYZ86 min
Jun 30, 8:40 PM MDTSevere Thunderstorm WarningBYZ33 min
Jul 1, 5:23 PM MDTSevere Thunderstorm WarningBYZ52 min
Jul 2, 11:25 AM MDTMesoscale DiscussionSPC65 min
Jul 2, 11:41 AM MDTSevere Thunderstorm WatchSPC7 hr
Jul 2, 2:17 PM MDTMesoscale DiscussionSPC88 min
Jul 2, 6:29 PM MDTMesoscale DiscussionSPC61 min
Jul 6, 4:40 PM MDTMesoscale DiscussionSPC35 min
Jul 6, 5:00 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 7:35 PM MDTMesoscale DiscussionSPC55 min
Jul 6, 8:29 PM MDTSpecial Weather StatementBYZ61 min
Jul 8, 1:51 AM MDTSpecial Weather StatementBYZ54 min
Jul 8, 1:02 PM MDTMesoscale DiscussionSPC88 min
Jul 8, 2:20 PM MDTTornado WatchSPC8 hr
Jul 8, 3:40 PM MDTSevere Thunderstorm WarningBYZ65 min
Jul 8, 4:29 PM MDTSevere Thunderstorm WarningBYZ26 min
Jul 8, 5:22 PM MDTSevere Thunderstorm WarningBYZ19 min
Jul 8, 5:46 PM MDTMesoscale DiscussionSPC89 min
Jul 8, 5:56 PM MDTSevere Thunderstorm WarningBYZ29 min
Jul 8, 6:18 PM MDTSevere Thunderstorm WarningBYZ17 min
Jul 8, 8:52 PM MDTSpecial Weather StatementBYZ23 min
Jul 13, 10:47 AM MDTSpecial Weather StatementBYZ58 min
Jul 13, 1:02 PM MDTSevere Thunderstorm WatchSPC9 hr
Jul 13, 5:05 PM MDTMesoscale DiscussionSPC55 min
Jul 13, 5:08 PM MDTSpecial Weather StatementBYZ82 min
Jul 19, 2:22 PM MDTMesoscale DiscussionSPC113 min
Aug 6, 7:46 AM MDTSpecial Weather StatementBYZ59 min
Aug 7, 11:50 AM MDTMesoscale DiscussionSPC115 min
Aug 7, 2:38 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 7, 4:15 PM MDTFlash Flood WatchBYZ6 hr
Aug 7, 5:55 PM MDTMesoscale DiscussionSPC95 min
Aug 7, 7:41 PM MDTSevere Thunderstorm WarningBYZ34 min
Aug 7, 8:05 PM MDTSevere Thunderstorm WarningBYZ55 min
Aug 7, 8:45 PM MDTSevere Thunderstorm WarningBYZ45 min
Aug 7, 8:50 PM MDTSevere Thunderstorm WarningBYZ55 min
Aug 7, 8:53 PM MDTMesoscale DiscussionSPC97 min
Aug 8, 1:50 AM MDTSpecial Weather StatementBYZ55 min
Aug 8, 4:53 PM MDTSpecial Weather StatementBYZ52 min
Aug 8, 5:01 PM MDTSevere Thunderstorm WarningBYZ48 min
Aug 14, 10:20 PM MDTSpecial Weather StatementBYZ55 min
Aug 23, 7:55 PM MDTTornado WatchSPC5 hr
Aug 23, 11:01 PM MDTSpecial Weather StatementBYZ59 min
Sep 4, 3:37 PM MDTFire Weather WatchBYZ37 hr
Sep 6, 4:46 AM MDTRed Flag WarningBYZ16 hr
Sep 6, 4:44 PM MDTSpecial Weather StatementBYZ61 min
Sep 7, 11:43 PM MDTSpecial Weather StatementBYZ62 min
Sep 10, 4:12 AM MDTRed Flag WarningBYZ17 hr
Sep 13, 1:44 PM MDTMesoscale DiscussionSPC61 min
Sep 18, 3:19 AM MDTFire Weather WatchBYZ36 hr
Sep 19, 3:47 AM MDTRed Flag WarningBYZ18 hr
Sep 24, 2:57 PM MDTFire Weather WatchBYZ24 hr
Sep 25, 2:56 PM MDTRed Flag WarningBYZ31 hr
Sep 28, 2:18 PM MDTRed Flag WarningBYZ31 hr
Sep 30, 2:50 PM MDTWinter Weather AdvisoryBYZ18 hr
Oct 2, 2:48 PM MDTWinter Storm WatchBYZ49 hr
Oct 4, 3:31 PM MDTWinter Weather AdvisoryBYZ35 hr
Oct 11, 6:45 PM MDTWinter Weather AdvisoryBYZ5 hr
Oct 28, 3:35 AM MDTWinter Weather AdvisoryBYZ30 hr
Dec 8, 2:24 PM MSTWind Chill AdvisoryBYZ21 hr
Dec 9, 2:53 PM MSTWind Chill AdvisoryBYZ12 hr
Dec 11, 2:58 PM MSTWinter Storm WatchBYZ24 hr
Dec 12, 2:57 PM MSTWinter Weather AdvisoryBYZ50 hr
Dec 22, 4:17 AM MSTWinter Weather AdvisoryBYZ41 hr
Dec 23, 9:06 PM MSTWind Chill AdvisoryBYZ13 hr
Dec 24, 3:01 PM MSTWind Chill AdvisoryBYZ13 hr
Dec 24, 3:01 PM MSTWinter Weather AdvisoryBYZ13 hr
Dec 24, 9:37 PM MSTWinter Storm WarningBYZ43 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 archive20082010

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.