Alert archive / Nebraska / Sheridan County

Weather alerts in Sheridan County, Nebraska, 2009

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

Sheridan County and its neighbors

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

Alerts
172
Warnings
67
Watches
33
Advisories
27
Busiest month
June42 alerts
Busiest day
June 18, 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.

Sheridan County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings481863%21100%19 min
Flash flood warnings110%1100%10 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS North Platte, NE: tornado warnings711185%2065%15 min
NWS North Platte, NE: severe thunderstorm warnings41619753%45676%22 min
NWS North Platte, NE: flash flood warnings8450%4100%61 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 9, 2:34 AM MSTWind AdvisoryLBF14 hr
Jan 11, 2:16 PM MSTWind AdvisoryLBF27 hr
Jan 12, 1:46 AM MSTHigh Wind WarningLBF13 hr
Jan 18, 2:30 AM MSTWind AdvisoryLBF15 hr
Jan 19, 2:19 AM MSTWind AdvisoryLBF15 hr
Jan 19, 11:30 AM MSTRed Flag WarningLBF6 hr
Jan 24, 2:29 AM MSTWinter Weather AdvisoryLBF64 hr
Feb 6, 2:43 AM MSTRed Flag WarningLBF14 hr
Feb 12, 2:24 PM MSTWinter Weather AdvisoryLBF24 hr
Mar 5, 2:24 AM MSTRed Flag WarningLBF16 hr
Mar 15, 11:41 AM MDTRed Flag WarningLBF7 hr
Mar 15, 2:10 PM MDTFire Weather WatchLBF13 hr
Mar 16, 2:50 AM MDTRed Flag WarningLBF16 hr
Mar 21, 2:45 PM MDTWinter Storm WatchLBF24 hr
Mar 21, 5:23 PM MDTMesoscale DiscussionSPC97 min
Mar 22, 2:26 PM MDTBlizzard WarningLBF46 hr
Mar 22, 2:26 PM MDTWinter Weather AdvisoryLBF51 hr
Mar 24, 2:41 AM MDTWind AdvisoryLBF17 hr
Mar 29, 2:28 AM MDTWinter Storm WatchLBF25 hr
Mar 29, 8:57 PM MDTWinter Storm WarningLBF42 hr
Mar 30, 3:43 AM MDTWinter Weather AdvisoryLBF32 hr
Apr 2, 2:28 AM MDTWinter Storm WatchLBF24 hr
Apr 3, 2:36 AM MDTBlizzard WarningLBF51 hr
Apr 3, 2:36 AM MDTWinter Storm WarningLBF32 hr
Apr 4, 4:57 AM MDTMesoscale DiscussionSPC4 hr
Apr 13, 2:35 AM MDTDense Fog AdvisoryLBF2 hr
Apr 14, 4:28 PM MDTWind AdvisoryLBF28 hr
Apr 22, 2:03 PM MDTFire Weather WatchLBF13 hr
Apr 23, 3:18 AM MDTRed Flag WarningLBF16 hr
Apr 28, 2:12 AM MDTWind AdvisoryLBF12 hr
May 8, 1:13 PM MDTWind AdvisoryLBF5 hr
May 12, 2:09 PM MDTWind AdvisoryLBF29 hr
May 13, 2:29 PM MDTFrost AdvisoryLBF17 hr
May 19, 1:58 PM MDTRed Flag WarningLBF4 hr
May 20, 2:01 PM MDTMesoscale DiscussionSPC89 min
May 22, 6:29 PM MDTMesoscale DiscussionSPC2 hr
May 24, 6:31 PM MDTMesoscale DiscussionSPC119 min
May 28, 4:34 PM MDTSevere Thunderstorm WarningLBF56 min
May 31, 2:35 PM MDTSevere Thunderstorm WarningLBF25 min
May 31, 2:57 PM MDTSevere Thunderstorm WarningLBF63 min
May 31, 3:34 PM MDTSevere Thunderstorm WarningLBF56 min
Jun 5, 2:48 PM MDTTornado WatchSPC7 hr
Jun 5, 4:55 PM MDTSevere Thunderstorm WarningLBF50 min
Jun 5, 5:37 PM MDTMesoscale DiscussionSPC83 min
Jun 5, 6:29 PM MDTSevere Thunderstorm WarningLBF46 min
Jun 6, 12:02 AM MDTSevere Thunderstorm WarningLBF58 min
Jun 9, 6:04 PM MDTAreal Flood AdvisoryLBF100 min
Jun 13, 4:26 PM MDTMesoscale DiscussionSPC64 min
Jun 13, 5:21 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 13, 7:58 PM MDTMesoscale DiscussionSPC62 min
Jun 14, 1:50 PM MDTTornado WatchSPC7 hr
Jun 14, 6:46 PM MDTTornado WatchSPC5 hr
Jun 15, 6:02 PM MDTSevere Thunderstorm WarningLBF58 min
Jun 15, 6:58 PM MDTSevere Thunderstorm WarningLBF22 min
Jun 17, 4:02 PM MDTMesoscale DiscussionSPC88 min
Jun 17, 4:26 PM MDTMesoscale DiscussionSPC94 min
Jun 17, 4:50 PM MDTSevere Thunderstorm WarningLBF55 min
Jun 17, 5:32 PM MDTSevere Thunderstorm WarningLBF58 min
Jun 17, 5:35 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 17, 9:40 PM MDTSevere Thunderstorm WarningLBF50 min
Jun 17, 9:49 PM MDTSevere Thunderstorm WarningLBF41 min
Jun 17, 10:01 PM MDTSevere Thunderstorm WatchSPC6 hr
Jun 17, 10:27 PM MDTSevere Thunderstorm WarningLBF48 min
Jun 17, 10:30 PM MDTSevere Thunderstorm WarningLBF45 min
Jun 17, 11:15 PM MDTSevere Thunderstorm WarningLBF45 min
Jun 18, 12:46 AM MDTMesoscale DiscussionSPC89 min
Jun 18, 5:52 PM MDTMesoscale DiscussionSPC113 min
Jun 18, 6:49 PM MDTSevere Thunderstorm WarningLBF41 min
Jun 18, 7:27 PM MDTSevere Thunderstorm WarningLBF33 min
Jun 23, 12:07 AM MDTMesoscale DiscussionSPC53 min
Jun 23, 12:38 AM MDTSevere Thunderstorm WatchSPC6 hr
Jun 23, 1:09 AM MDTSevere Thunderstorm WarningLBF51 min
Jun 23, 1:49 AM MDTSevere Thunderstorm WarningLBF71 min
Jun 23, 2:00 AM MDTSevere Thunderstorm WarningLBF60 min
Jun 23, 2:17 AM MDTMesoscale DiscussionSPC88 min
Jun 23, 2:18 PM MDTMesoscale DiscussionSPC87 min
Jun 23, 5:37 PM MDTTornado WatchSPC6 hr
Jun 26, 2:23 PM MDTMesoscale DiscussionSPC67 min
Jun 26, 2:38 PM MDTSevere Thunderstorm WatchSPC5 hr
Jun 26, 3:50 PM MDTTornado WatchSPC7 hr
Jun 26, 5:55 PM MDTSevere Thunderstorm WarningLBF35 min
Jun 29, 3:36 PM MDTMesoscale DiscussionSPC84 min
Jun 30, 5:40 PM MDTMesoscale DiscussionSPC65 min
Jun 30, 6:39 PM MDTSevere Thunderstorm WarningLBF66 min
Jun 30, 7:27 PM MDTSevere Thunderstorm WarningLBF48 min
Jun 30, 8:17 PM MDTSevere Thunderstorm WarningLBF43 min
Jul 1, 12:33 PM MDTMesoscale DiscussionSPC117 min
Jul 1, 4:29 PM MDTMesoscale DiscussionSPC61 min
Jul 1, 6:38 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 1, 9:19 PM MDTMesoscale DiscussionSPC56 min
Jul 2, 2:17 PM MDTMesoscale DiscussionSPC88 min
Jul 2, 6:29 PM MDTMesoscale DiscussionSPC61 min
Jul 2, 9:08 PM MDTMesoscale DiscussionSPC97 min
Jul 3, 2:21 PM MDTSevere Thunderstorm WarningLBF39 min
Jul 3, 2:48 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 3, 2:57 PM MDTSevere Thunderstorm WarningLBF48 min
Jul 3, 3:11 PM MDTSevere Thunderstorm WarningLBF33 min
Jul 7, 10:05 PM MDTMesoscale DiscussionSPC55 min
Jul 10, 12:32 AM MDTSevere Thunderstorm WarningLBF43 min
Jul 10, 5:20 PM MDTMesoscale DiscussionSPC85 min
Jul 10, 7:22 PM MDTSevere Thunderstorm WarningLBF42 min
Jul 11, 12:28 AM MDTMesoscale DiscussionSPC62 min
Jul 11, 3:56 PM MDTSevere Thunderstorm WatchSPC9 hr
Jul 11, 10:30 PM MDTSevere Thunderstorm WarningLBF75 min
Jul 13, 4:52 PM MDTSevere Thunderstorm WatchSPC7 hr
Jul 19, 2:22 PM MDTMesoscale DiscussionSPC113 min
Jul 20, 1:52 PM MDTSevere Thunderstorm WarningLBF53 min
Jul 20, 2:25 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 20, 5:01 PM MDTMesoscale DiscussionSPC89 min
Jul 23, 1:56 PM MDTMesoscale DiscussionSPC94 min
Jul 23, 2:30 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 3, 6:46 PM MDTMesoscale DiscussionSPC119 min
Aug 3, 7:44 PM MDTSevere Thunderstorm WarningLBF46 min
Aug 3, 8:35 PM MDTSevere Thunderstorm WarningLBF40 min
Aug 4, 3:37 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 4, 5:19 PM MDTMesoscale DiscussionSPC56 min
Aug 4, 6:40 PM MDTMesoscale DiscussionSPC65 min
Aug 4, 9:47 PM MDTSevere Thunderstorm WarningLBF58 min
Aug 4, 10:37 PM MDTMesoscale DiscussionSPC83 min
Aug 4, 10:40 PM MDTSevere Thunderstorm WarningLBF65 min
Aug 6, 4:07 PM MDTTornado WatchSPC4 hr
Aug 6, 7:14 PM MDTSevere Thunderstorm WarningLBF46 min
Aug 6, 7:30 PM MDTSevere Thunderstorm WarningLBF45 min
Aug 6, 7:34 PM MDTMesoscale DiscussionSPC86 min
Aug 7, 5:37 PM MDTMesoscale DiscussionSPC113 min
Aug 7, 7:57 PM MDTSevere Thunderstorm WatchSPC5 hr
Aug 7, 8:52 PM MDTAreal Flood AdvisoryLBF3 hr
Aug 7, 10:16 PM MDTSevere Thunderstorm WarningLBF59 min
Aug 7, 10:53 PM MDTSevere Thunderstorm WarningLBF37 min
Aug 8, 2:18 AM MDTMesoscale DiscussionSPC117 min
Aug 8, 8:57 AM MDTSevere Thunderstorm WarningLBF48 min
Aug 8, 9:52 AM MDTMesoscale DiscussionSPC23 min
Aug 8, 7:29 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 12, 1:22 PM MDTMesoscale DiscussionSPC83 min
Aug 14, 3:28 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 14, 3:50 PM MDTSevere Thunderstorm WarningLBF55 min
Aug 14, 4:05 PM MDTFlash Flood WarningLBF3 hr
Aug 15, 2:08 PM MDTSevere Thunderstorm WatchSPC8 hr
Aug 15, 4:53 PM MDTSevere Thunderstorm WarningLBF67 min
Aug 15, 5:33 PM MDTSevere Thunderstorm WarningLBF57 min
Aug 15, 5:45 PM MDTSevere Thunderstorm WarningLBF60 min
Aug 15, 5:52 PM MDTMesoscale DiscussionSPC53 min
Aug 18, 2:35 PM MDTMesoscale DiscussionSPC115 min
Aug 18, 5:10 PM MDTSevere Thunderstorm WatchSPC5 hr
Aug 18, 6:22 PM MDTSevere Thunderstorm WarningLBF38 min
Sep 7, 5:34 PM MDTSevere Thunderstorm WarningLBF42 min
Sep 8, 1:53 PM MDTSevere Thunderstorm WatchSPC8 hr
Sep 8, 4:52 PM MDTSevere Thunderstorm WarningLBF53 min
Sep 26, 1:34 PM MDTWind AdvisoryLBF25 hr
Sep 27, 2:54 PM MDTFreeze WarningLBF18 hr
Sep 30, 2:35 AM MDTHigh Wind WatchLBF24 hr
Sep 30, 2:57 PM MDTWind AdvisoryLBF49 hr
Sep 30, 5:01 PM MDTMesoscale DiscussionSPC89 min
Oct 1, 2:51 AM MDTHigh Wind WarningLBF17 hr
Oct 2, 12:58 PM MDTFreeze WarningLBF19 hr
Oct 9, 12:53 PM MDTWinter Weather AdvisoryLBF20 hr
Oct 10, 2:53 PM MDTWinter Storm WatchLBF12 hr
Oct 11, 2:41 AM MDTWinter Weather AdvisoryLBF30 hr
Oct 27, 2:14 AM MDTWinter Storm WatchLBF25 hr
Oct 27, 3:04 PM MDTWinter Storm WarningLBF66 hr
Oct 28, 12:13 PM MDTMesoscale DiscussionSPC6 hr
Oct 28, 9:56 PM MDTMesoscale DiscussionSPC4 hr
Oct 29, 5:57 PM MDTMesoscale DiscussionSPC4 hr
Nov 6, 8:23 AM MSTRed Flag WarningLBF9 hr
Dec 6, 2:13 AM MSTWinter Weather AdvisoryLBF15 hr
Dec 7, 2:18 PM MSTWinter Weather AdvisoryLBF36 hr
Dec 8, 2:41 AM MSTWind Chill AdvisoryLBF30 hr
Dec 9, 2:43 PM MSTWind Chill AdvisoryLBF18 hr
Dec 21, 3:13 AM MSTWinter Storm WatchLBF11 hr
Dec 21, 2:40 PM MSTWinter Storm WarningLBF5 days
Dec 21, 4:15 PM MSTWinter Weather AdvisoryLBF6 hr
Dec 24, 3:44 AM MSTWinter Weather AdvisoryLBF3 days

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.