Alert archive / South Dakota / Bennett County

Weather alerts in Bennett County, South Dakota, 2009

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

Bennett County and its neighbors

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

Alerts
121
Warnings
32
Watches
30
Advisories
23
Busiest month
June28 alerts
Busiest day
June 23, 20095 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering Bennett County in 2009 had a tornado report inside them.

Bennett County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings221436%1173%19 min
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Rapid City, SD: tornado warnings27678%1090%19 min
NWS Rapid City, SD: severe thunderstorm warnings26217234%34579%27 min
NWS Rapid City, SD: flash flood warnings10460%475%59 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 8, 2:25 PM MSTWind AdvisoryUNR26 hr
Jan 11, 4:23 AM MSTHigh Wind WarningUNR32 hr
Jan 11, 2:23 PM MSTWind AdvisoryUNR12 hr
Jan 12, 12:16 PM MSTWind AdvisoryUNR2 hr
Jan 18, 3:34 AM MSTWind AdvisoryUNR13 hr
Jan 19, 3:35 AM MSTWind AdvisoryUNR11 hr
Jan 24, 10:28 AM MSTWinter Weather AdvisoryUNR53 hr
Jan 27, 4:08 PM MSTWinter Weather AdvisoryUNR25 hr
Feb 26, 1:07 PM MSTWinter Weather AdvisoryUNR26 hr
Feb 27, 10:25 AM MSTMesoscale DiscussionSPC4 hr
Mar 9, 3:23 AM MDTWinter Weather AdvisoryUNR33 hr
Mar 22, 3:30 AM MDTBlizzard WarningUNR65 hr
Mar 22, 3:30 AM MDTWinter Storm WatchUNR11 hr
Mar 29, 3:04 AM MDTWinter Storm WatchUNR12 hr
Mar 29, 3:04 AM MDTWinter Storm WarningUNR51 hr
Mar 30, 2:20 PM MDTMesoscale DiscussionSPC6 hr
Apr 2, 4:06 AM MDTWinter Storm WatchUNR25 hr
Apr 3, 4:55 AM MDTBlizzard WarningUNR46 hr
Apr 4, 4:57 AM MDTMesoscale DiscussionSPC4 hr
Apr 8, 2:36 PM MDTWinter Weather AdvisoryUNR25 hr
Apr 9, 3:07 PM MDTFlood WatchUNR72 hr
Apr 28, 3:41 AM MDTWind AdvisoryUNR11 hr
May 12, 2:22 PM MDTWind AdvisoryUNR29 hr
May 12, 5:57 PM MDTSevere Thunderstorm WarningUNR63 min
Jun 13, 4:26 PM MDTMesoscale DiscussionSPC64 min
Jun 13, 4:43 PM MDTSevere Thunderstorm WarningUNR62 min
Jun 13, 5:21 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 13, 7:58 PM MDTMesoscale DiscussionSPC62 min
Jun 13, 11:48 PM MDTAreal Flood AdvisoryUNR11 hr
Jun 14, 3:53 AM MDTFlood WatchUNR19 hr
Jun 14, 4:09 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 14, 6:17 PM MDTMesoscale DiscussionSPC118 min
Jun 14, 6:46 PM MDTTornado WatchSPC5 hr
Jun 15, 6:48 PM MDTSevere Thunderstorm WarningUNR57 min
Jun 15, 7:49 PM MDTSevere Thunderstorm WarningUNR56 min
Jun 17, 4:02 PM MDTMesoscale DiscussionSPC88 min
Jun 17, 4:26 PM MDTMesoscale DiscussionSPC94 min
Jun 17, 5:35 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 17, 11:01 PM MDTMesoscale DiscussionSPC89 min
Jun 18, 5:52 PM MDTMesoscale DiscussionSPC113 min
Jun 23, 12:07 AM MDTMesoscale DiscussionSPC53 min
Jun 23, 12:38 AM MDTSevere Thunderstorm WatchSPC6 hr
Jun 23, 2:17 AM MDTMesoscale DiscussionSPC88 min
Jun 23, 3:16 AM MDTSevere Thunderstorm WarningUNR57 min
Jun 23, 3:43 AM MDTMesoscale DiscussionSPC92 min
Jun 25, 3:50 PM MDTTornado WatchSPC5 hr
Jun 25, 6:33 PM MDTMesoscale DiscussionSPC57 min
Jun 26, 3:04 AM MDTFlash Flood WatchUNR18 hr
Jun 26, 1:53 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 26, 5:05 PM MDTMesoscale DiscussionSPC85 min
Jun 26, 5:24 PM MDTTornado WatchSPC4 hr
Jun 29, 3:36 PM MDTMesoscale DiscussionSPC84 min
Jul 1, 12:33 PM MDTMesoscale DiscussionSPC117 min
Jul 1, 4:29 PM MDTMesoscale DiscussionSPC61 min
Jul 2, 11:41 AM MDTSevere Thunderstorm WatchSPC7 hr
Jul 2, 12:49 PM MDTFlash Flood WatchUNR15 hr
Jul 2, 6:29 PM MDTMesoscale DiscussionSPC61 min
Jul 7, 10:05 PM MDTMesoscale DiscussionSPC55 min
Jul 8, 2:20 PM MDTTornado WatchSPC8 hr
Jul 8, 6:41 PM MDTSevere Thunderstorm WarningUNR64 min
Jul 8, 8:36 PM MDTTornado WarningUNR39 min
Jul 8, 8:42 PM MDTMesoscale DiscussionSPC93 min
Jul 8, 9:06 PM MDTSevere Thunderstorm WarningUNR54 min
Jul 10, 12:39 AM MDTSevere Thunderstorm WarningUNR81 min
Jul 11, 4:54 AM MDTSevere Thunderstorm WarningUNR66 min
Jul 11, 6:14 AM MDTMesoscale DiscussionSPC61 min
Jul 11, 6:38 AM MDTSevere Thunderstorm WarningUNR67 min
Jul 11, 8:10 AM MDTSevere Thunderstorm WarningUNR45 min
Jul 13, 12:34 PM MDTTornado WatchSPC8 hr
Jul 13, 7:47 PM MDTMesoscale DiscussionSPC58 min
Jul 13, 8:18 PM MDTSevere Thunderstorm WarningUNR57 min
Jul 13, 8:42 PM MDTTornado WatchSPC4 hr
Jul 13, 9:04 PM MDTSevere Thunderstorm WarningUNR56 min
Jul 13, 9:15 PM MDTAreal Flood AdvisoryUNR9 hr
Jul 19, 2:22 PM MDTMesoscale DiscussionSPC113 min
Aug 3, 5:58 PM MDTMesoscale DiscussionSPC2 hr
Aug 3, 6:46 PM MDTMesoscale DiscussionSPC119 min
Aug 3, 7:44 PM MDTSevere Thunderstorm WarningUNR20 min
Aug 4, 3:37 PM MDTSevere Thunderstorm WatchSPC7 hr
Aug 4, 9:01 PM MDTSevere Thunderstorm WarningUNR74 min
Aug 6, 4:07 PM MDTTornado WatchSPC4 hr
Aug 6, 7:34 PM MDTMesoscale DiscussionSPC86 min
Aug 6, 7:37 PM MDTSevere Thunderstorm WarningUNR39 min
Aug 6, 8:15 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 7, 4:56 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 8, 2:18 AM MDTMesoscale DiscussionSPC117 min
Aug 8, 9:52 AM MDTMesoscale DiscussionSPC23 min
Aug 12, 1:22 PM MDTMesoscale DiscussionSPC83 min
Aug 13, 8:07 PM MDTSevere Thunderstorm WarningUNR68 min
Aug 14, 3:28 PM MDTSevere Thunderstorm WatchSPC6 hr
Aug 15, 2:08 PM MDTSevere Thunderstorm WatchSPC8 hr
Aug 15, 5:17 PM MDTSevere Thunderstorm WarningUNR58 min
Aug 15, 5:52 PM MDTMesoscale DiscussionSPC53 min
Aug 15, 5:54 PM MDTSevere Thunderstorm WarningUNR66 min
Aug 18, 2:35 PM MDTMesoscale DiscussionSPC115 min
Aug 18, 4:49 PM MDTSevere Thunderstorm WarningUNR56 min
Aug 18, 5:10 PM MDTSevere Thunderstorm WatchSPC5 hr
Sep 8, 1:32 PM MDTMesoscale DiscussionSPC88 min
Sep 8, 2:13 PM MDTSevere Thunderstorm WarningUNR62 min
Sep 8, 2:50 PM MDTSevere Thunderstorm WarningUNR70 min
Sep 26, 2:39 AM MDTWind AdvisoryUNR39 hr
Sep 29, 3:29 AM MDTHigh Wind WatchUNR36 hr
Sep 30, 3:00 PM MDTWind AdvisoryUNR48 hr
Sep 30, 5:01 PM MDTMesoscale DiscussionSPC89 min
Oct 2, 3:46 AM MDTFreeze WarningUNR29 hr
Oct 2, 5:54 AM MDTHigh Wind WarningUNR9 hr
Oct 10, 2:23 PM MDTWinter Storm WatchUNR13 hr
Oct 11, 3:35 AM MDTWinter Weather AdvisoryUNR24 hr
Oct 27, 3:16 PM MDTWinter Storm WatchUNR13 hr
Oct 28, 4:32 AM MDTWinter Storm WarningUNR46 hr
Oct 28, 9:56 PM MDTMesoscale DiscussionSPC4 hr
Nov 30, 1:08 PM MSTWind AdvisoryUNR28 hr
Dec 7, 3:23 PM MSTWinter Weather AdvisoryUNR36 hr
Dec 8, 2:33 PM MSTWind Chill AdvisoryUNR21 hr
Dec 9, 2:55 PM MSTWind Chill AdvisoryUNR13 hr
Dec 21, 1:28 PM MSTWinter Storm WatchUNR39 hr
Dec 21, 8:45 PM MSTDense Fog AdvisoryUNR10 hr
Dec 22, 4:23 AM MSTWinter Storm WarningUNR5 days
Dec 24, 2:33 PM MSTBlizzard WarningUNR56 hr
Dec 25, 6:21 AM MSTMesoscale DiscussionSPC5 hr
Dec 26, 10:25 PM MSTWinter Weather AdvisoryUNR4 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.