Alert archive / South Dakota / Jerauld County

Weather alerts in Jerauld County, South Dakota, 2009

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

Jerauld County and its neighbors

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

Alerts
116
Warnings
25
Watches
23
Advisories
30
Busiest month
June22 alerts
Busiest day
June 16, 20097 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 4 tornado warnings covering Jerauld County in 2009 had a tornado report inside them.

Jerauld County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings40100%0
Severe thunderstorm warnings12925%1050%23 min
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings491667%2378%21 min
NWS Sioux Falls, SD: severe thunderstorm warnings23217226%37481%19 min
NWS Sioux Falls, SD: flash flood warnings251828%3488%49 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 2, 3:55 PM CSTWinter Weather AdvisoryFSD29 hr
Jan 3, 8:56 PM CSTWind Chill AdvisoryFSD13 hr
Jan 11, 2:50 PM CSTWinter Weather AdvisoryFSD30 hr
Jan 11, 2:58 PM CSTWind AdvisoryFSD21 hr
Jan 12, 5:34 AM CSTMesoscale DiscussionSPC4 hr
Jan 12, 10:07 AM CSTHigh Wind WarningFSD8 hr
Jan 12, 10:56 AM CSTMesoscale DiscussionSPC6 hr
Jan 13, 3:17 PM CSTWind Chill AdvisoryFSD33 hr
Jan 23, 3:33 AM CSTWind Chill AdvisoryFSD32 hr
Feb 17, 6:04 AM CSTDense Fog AdvisoryFSD4 hr
Feb 24, 4:11 PM CSTWinter Storm WatchFSD23 hr
Feb 25, 4:15 AM CSTWinter Storm WarningFSD41 hr
Feb 25, 11:07 AM CSTWinter Weather AdvisoryFSD29 hr
Feb 25, 10:20 PM CSTMesoscale DiscussionSPC6 hr
Feb 26, 4:04 PM CSTWind Chill AdvisoryFSD18 hr
Feb 27, 11:25 AM CSTMesoscale DiscussionSPC4 hr
Mar 8, 12:56 PM CDTWinter Storm WatchFSD27 hr
Mar 9, 4:05 PM CDTWinter Storm WarningFSD12 hr
Mar 10, 3:40 AM CDTWinter Weather AdvisoryFSD23 hr
Mar 10, 2:51 PM CDTWind Chill AdvisoryFSD21 hr
Mar 22, 3:44 AM CDTWind AdvisoryFSD44 hr
Mar 22, 9:57 AM CDTSevere Thunderstorm WarningFSD33 min
Mar 22, 10:58 AM CDTSevere Thunderstorm WarningFSD16 min
Mar 23, 12:16 PM CDTTornado WatchSPC4 hr
Mar 23, 3:50 PM CDTTornado WatchSPC6 hr
Mar 23, 6:04 PM CDTMesoscale DiscussionSPC116 min
Mar 24, 3:25 AM CDTWind AdvisoryFSD21 hr
Mar 28, 3:59 PM CDTWinter Storm WatchFSD36 hr
Mar 29, 4:02 PM CDTWinter Storm WarningFSD12 hr
Mar 30, 4:08 AM CDTBlizzard WarningFSD39 hr
Mar 30, 3:20 PM CDTMesoscale DiscussionSPC6 hr
Mar 30, 7:59 PM CDTMesoscale DiscussionSPC4 hr
Mar 31, 1:22 AM CDTMesoscale DiscussionSPC4 hr
Apr 2, 3:24 PM CDTWinter Storm WatchFSD30 hr
Apr 3, 4:05 PM CDTWinter Storm WarningFSD13 hr
Apr 3, 9:45 PM CDTWinter Weather AdvisoryFSD39 hr
Apr 15, 11:05 AM CDTWind AdvisoryFSD8 hr
Apr 29, 9:27 PM CDTMesoscale DiscussionSPC93 min
May 4, 6:21 PM CDTMesoscale DiscussionSPC84 min
May 12, 3:49 PM CDTHigh Wind WatchFSD12 hr
May 12, 3:49 PM CDTWind AdvisoryFSD30 hr
May 12, 7:08 PM CDTSevere Thunderstorm WatchSPC7 hr
May 12, 8:42 PM CDTMesoscale DiscussionSPC93 min
May 15, 2:39 PM CDTFrost AdvisoryFSD17 hr
Jun 15, 4:08 PM CDTMesoscale DiscussionSPC67 min
Jun 16, 3:43 PM CDTTornado WarningFSD47 min
Jun 16, 4:16 PM CDTTornado WatchSPC7 hr
Jun 16, 4:29 PM CDTTornado WarningFSD46 min
Jun 16, 5:04 PM CDTTornado WarningFSD41 min
Jun 16, 5:28 PM CDTSevere Thunderstorm WarningFSD47 min
Jun 16, 5:39 PM CDTMesoscale DiscussionSPC96 min
Jun 16, 6:18 PM CDTSevere Thunderstorm WarningFSD29 min
Jun 18, 6:49 PM CDTMesoscale DiscussionSPC86 min
Jun 18, 6:52 PM CDTMesoscale DiscussionSPC113 min
Jun 23, 4:43 AM CDTMesoscale DiscussionSPC92 min
Jun 23, 7:24 AM CDTMesoscale DiscussionSPC96 min
Jun 23, 8:01 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 24, 2:12 PM CDTMesoscale DiscussionSPC93 min
Jun 24, 5:34 PM CDTMesoscale DiscussionSPC86 min
Jun 24, 6:16 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 24, 8:13 PM CDTTornado WarningFSD40 min
Jun 24, 8:49 PM CDTMesoscale DiscussionSPC86 min
Jun 26, 6:24 PM CDTTornado WatchSPC4 hr
Jun 26, 8:55 PM CDTMesoscale DiscussionSPC95 min
Jun 26, 9:55 PM CDTSevere Thunderstorm WarningFSD35 min
Jun 26, 10:29 PM CDTSevere Thunderstorm WarningFSD46 min
Jul 7, 10:14 AM CDTMesoscale DiscussionSPC91 min
Jul 7, 1:47 PM CDTMesoscale DiscussionSPC58 min
Jul 7, 2:13 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 7, 6:33 PM CDTMesoscale DiscussionSPC27 min
Jul 8, 9:58 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 8, 11:27 PM CDTMesoscale DiscussionSPC93 min
Jul 9, 3:07 AM CDTMesoscale DiscussionSPC83 min
Jul 9, 3:41 AM CDTSevere Thunderstorm WatchSPC6 hr
Jul 9, 3:52 AM CDTSevere Thunderstorm WarningFSD38 min
Jul 9, 4:13 AM CDTSevere Thunderstorm WarningFSD32 min
Jul 9, 4:29 AM CDTSevere Thunderstorm WarningFSD31 min
Jul 12, 2:30 AM CDTMesoscale DiscussionSPC60 min
Jul 13, 5:35 PM CDTSevere Thunderstorm WarningFSD40 min
Jul 13, 5:52 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 13, 6:10 PM CDTSevere Thunderstorm WarningFSD50 min
Jul 13, 6:48 PM CDTSevere Thunderstorm WarningFSD27 min
Jul 13, 11:24 PM CDTMesoscale DiscussionSPC66 min
Jul 31, 1:35 PM CDTMesoscale DiscussionSPC115 min
Aug 3, 6:58 PM CDTMesoscale DiscussionSPC2 hr
Aug 3, 8:02 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 8, 10:52 AM CDTMesoscale DiscussionSPC23 min
Aug 8, 11:15 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 8, 2:17 PM CDTMesoscale DiscussionSPC58 min
Aug 15, 6:52 PM CDTMesoscale DiscussionSPC53 min
Aug 15, 8:05 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 15, 11:37 PM CDTMesoscale DiscussionSPC53 min
Aug 18, 6:10 PM CDTSevere Thunderstorm WatchSPC5 hr
Sep 2, 4:32 PM CDTMesoscale DiscussionSPC88 min
Sep 4, 4:49 AM CDTDense Fog AdvisoryFSD3 hr
Sep 8, 2:32 PM CDTMesoscale DiscussionSPC88 min
Sep 8, 2:53 PM CDTSevere Thunderstorm WatchSPC8 hr
Sep 8, 7:10 PM CDTMesoscale DiscussionSPC2 hr
Sep 26, 2:26 PM CDTWind AdvisoryFSD30 hr
Sep 28, 3:20 PM CDTFrost AdvisoryFSD18 hr
Oct 8, 3:43 AM CDTFreeze WarningFSD28 hr
Oct 10, 3:16 PM CDTWinter Storm WatchFSD24 hr
Oct 11, 4:01 AM CDTWinter Weather AdvisoryFSD30 hr
Oct 29, 11:51 AM CDTWinter Weather AdvisoryFSD19 hr
Dec 1, 3:00 AM CSTWind AdvisoryFSD15 hr
Dec 7, 3:39 AM CSTWinter Weather AdvisoryFSD49 hr
Dec 9, 4:10 AM CSTWind Chill AdvisoryFSD30 hr
Dec 13, 6:13 AM CSTWind Chill AdvisoryFSD4 hr
Dec 14, 2:56 PM CSTWind Chill AdvisoryFSD18 hr
Dec 21, 2:02 PM CSTWinter Storm WatchFSD24 hr
Dec 21, 9:48 PM CSTDense Fog AdvisoryFSD4 hr
Dec 22, 4:30 AM CSTWinter Storm WarningFSD4 days
Dec 23, 4:48 AM CSTWinter Weather AdvisoryFSD13 hr
Dec 24, 3:31 PM CSTBlizzard WarningFSD44 hr
Dec 25, 7:21 AM CSTMesoscale DiscussionSPC5 hr
Dec 26, 3:56 AM CSTWinter Weather AdvisoryFSD20 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.