Alert archive / Iowa / Dickinson County

Weather alerts in Dickinson County, Iowa, 2008

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

Dickinson County and its neighbors

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

Alerts
142
Warnings
30
Watches
24
Advisories
50
Busiest month
June30 alerts
Busiest day
June 11, 20088 alerts

Over time

By month

Warning verification

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

3 of 4 tornado warnings covering Dickinson County in 2008 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 3 minutes after it went out.

Dickinson County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4325%1100%3 min
Severe thunderstorm warnings6433%1050%25 min
Flash flood warnings10100%0

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings551965%4990%14 min
NWS Sioux Falls, SD: severe thunderstorm warnings29613056%25382%19 min
NWS Sioux Falls, SD: flash flood warnings282029%4489%88 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 9, 9:53 PM CSTSnow AdvisoryFSD5 hr
Jan 11, 5:17 AM CSTDense Fog AdvisoryFSD6 hr
Jan 14, 3:56 AM CSTWind Chill AdvisoryFSD8 hr
Jan 17, 10:39 AM CSTWind Chill AdvisoryFSD52 hr
Jan 18, 2:59 PM CSTWind Chill WarningFSD13 hr
Jan 19, 3:16 PM CSTSnow AdvisoryFSD51 hr
Jan 21, 9:10 PM CSTWind Chill AdvisoryFSD14 hr
Jan 23, 2:30 PM CSTWind Chill AdvisoryFSD13 hr
Jan 28, 3:16 PM CSTWinter Weather AdvisoryFSD21 hr
Jan 28, 7:22 PM CSTWind AdvisoryFSD11 hr
Jan 29, 4:19 AM CSTWind Chill AdvisoryFSD29 hr
Jan 29, 7:39 AM CSTMesoscale DiscussionSPC5 hr
Feb 3, 9:23 AM CSTDense Fog AdvisoryFSD3 hr
Feb 3, 3:51 PM CSTSnow AdvisoryFSD20 hr
Feb 4, 6:14 AM CSTMesoscale DiscussionSPC5 hr
Feb 4, 10:09 AM CSTWinter Weather AdvisoryFSD4 hr
Feb 8, 3:09 PM CSTWind Chill AdvisoryFSD49 hr
Feb 8, 3:09 PM CSTWinter Weather AdvisoryFSD24 hr
Feb 9, 3:36 PM CSTWind Chill WarningFSD20 hr
Feb 10, 9:43 PM CSTSnow AdvisoryFSD29 hr
Feb 17, 12:25 PM CSTWind AdvisoryFSD7 hr
Feb 18, 6:37 PM CSTWind Chill AdvisoryFSD5 hr
Feb 19, 4:00 AM CSTWind Chill AdvisoryFSD31 hr
Feb 19, 3:34 PM CSTWind Chill WarningFSD20 hr
Feb 24, 6:18 AM CSTDense Fog AdvisoryFSD5 hr
Feb 24, 9:38 AM CSTAir Stagnation AdvisoryFSD4 hr
Feb 24, 3:58 PM CSTWinter Weather AdvisoryFSD26 hr
Mar 2, 3:34 AM CSTWind AdvisoryFSD14 hr
Mar 17, 4:32 AM CDTSnow AdvisoryFSD8 hr
Mar 17, 7:25 PM CDTDense Fog AdvisoryFSD15 hr
Mar 20, 9:58 AM CDTRiver Flood WarningFSD72 hr
Mar 22, 4:35 AM CDTRiver Flood WarningFSD29 hr
Mar 26, 11:15 AM CDTSnow AdvisoryFSD26 hr
Mar 30, 2:32 PM CDTSnow AdvisoryFSD28 hr
Apr 11, 8:41 AM CDTRiver Flood WarningFSD49 hr
Apr 14, 3:53 PM CDTWind AdvisoryFSD29 hr
Apr 21, 11:54 AM CDTMesoscale DiscussionSPC2 hr
Apr 26, 1:00 PM CDTRiver Flood WarningFSD69 hr
May 1, 4:34 PM CDTTornado WatchSPC5 hr
May 1, 6:33 PM CDTMesoscale DiscussionSPC57 min
May 1, 7:47 PM CDTMesoscale DiscussionSPC88 min
May 2, 2:48 PM CDTRiver Flood WarningFSD7 days
May 2, 3:49 PM CDTWind AdvisoryFSD12 hr
May 6, 10:56 AM CDTMesoscale DiscussionSPC94 min
May 6, 12:03 PM CDTSevere Thunderstorm WatchSPC7 hr
May 6, 2:22 PM CDTMesoscale DiscussionSPC113 min
May 10, 3:22 AM CDTWind AdvisoryFSD25 hr
May 12, 12:46 PM CDTWind AdvisoryFSD6 hr
May 17, 12:16 PM CDTWind AdvisoryFSD8 hr
May 19, 6:21 PM CDTMesoscale DiscussionSPC54 min
May 24, 9:01 PM CDTMesoscale DiscussionSPC59 min
May 29, 3:28 AM CDTFlash Flood WatchFSD24 hr
May 29, 9:44 AM CDTRiver Flood WarningFSD4 days
Jun 4, 8:09 AM CDTRiver Flood WarningFSD4 days
Jun 4, 3:00 PM CDTFlash Flood WatchFSD12 hr
Jun 5, 10:35 AM CDTFlash Flood WatchFSD11 hr
Jun 5, 10:55 AM CDTTornado Watch PDSSPC8 hr
Jun 5, 12:39 PM CDTFlash Flood WarningFSD3 hr
Jun 5, 2:01 PM CDTMesoscale DiscussionSPC59 min
Jun 5, 5:10 PM CDTMesoscale DiscussionSPC95 min
Jun 5, 5:50 PM CDTTornado Watch PDSSPC7 hr
Jun 5, 8:29 PM CDTHigh Wind WarningFSD4 hr
Jun 6, 4:12 AM CDTWind AdvisoryFSD13 hr
Jun 7, 3:14 AM CDTFlash Flood WatchFSD27 hr
Jun 7, 10:15 PM CDTMesoscale DiscussionSPC90 min
Jun 8, 10:26 AM CDTRiver Flood WarningFSD11 days
Jun 10, 3:46 PM CDTFlash Flood WatchFSD34 hr
Jun 11, 4:40 AM CDTMesoscale DiscussionSPC65 min
Jun 11, 5:16 AM CDTSevere Thunderstorm WatchSPC5 hr
Jun 11, 6:23 AM CDTMesoscale DiscussionSPC2 hr
Jun 11, 10:22 AM CDTWind AdvisoryFSD5 hr
Jun 11, 2:52 PM CDTTornado WatchSPC7 hr
Jun 11, 5:59 PM CDTMesoscale DiscussionSPC91 min
Jun 11, 6:28 PM CDTTornado WarningFSD32 min
Jun 11, 6:48 PM CDTTornado WarningFSD42 min
Jun 11, 7:02 PM CDTTornado WarningFSD28 min
Jun 12, 9:39 AM CDTRiver Flood WarningFSD4 days
Jun 21, 3:05 PM CDTMesoscale DiscussionSPC85 min
Jun 26, 6:38 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 26, 3:06 PM CDTFlash Flood WatchFSD12 hr
Jun 26, 9:46 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 3:41 PM CDTMesoscale DiscussionSPC94 min
Jun 28, 3:06 AM CDTWind AdvisoryFSD18 hr
Jul 6, 2:36 PM CDTMesoscale DiscussionSPC114 min
Jul 6, 3:05 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 6:54 PM CDTMesoscale DiscussionSPC66 min
Jul 10, 9:36 AM CDTMesoscale DiscussionSPC84 min
Jul 11, 3:13 PM CDTMesoscale DiscussionSPC92 min
Jul 11, 5:08 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 11, 8:29 PM CDTMesoscale DiscussionSPC91 min
Jul 17, 8:55 AM CDTMesoscale DiscussionSPC65 min
Jul 17, 10:57 AM CDTSevere Thunderstorm WatchSPC7 hr
Jul 17, 12:31 PM CDTSevere Thunderstorm WarningFSD29 min
Jul 17, 5:50 PM CDTMesoscale DiscussionSPC85 min
Jul 19, 1:09 PM CDTMesoscale DiscussionSPC2 hr
Jul 19, 2:28 PM CDTTornado WatchSPC8 hr
Jul 19, 4:42 PM CDTSevere Thunderstorm WarningFSD33 min
Jul 27, 6:22 PM CDTMesoscale DiscussionSPC83 min
Jul 31, 7:18 AM CDTSevere Thunderstorm WatchSPC6 hr
Jul 31, 8:03 AM CDTMesoscale DiscussionSPC87 min
Jul 31, 10:28 AM CDTMesoscale DiscussionSPC92 min
Aug 2, 11:13 PM CDTSevere Thunderstorm WatchSPC4 hr
Aug 3, 2:29 PM CDTMesoscale DiscussionSPC2 hr
Aug 3, 8:38 PM CDTMesoscale DiscussionSPC2 hr
Aug 13, 4:37 PM CDTMesoscale DiscussionSPC53 min
Aug 13, 4:45 PM CDTSevere Thunderstorm WatchSPC4 hr
Aug 13, 5:46 PM CDTSevere Thunderstorm WarningFSD44 min
Aug 13, 6:05 PM CDTTornado WarningFSD25 min
Aug 13, 6:28 PM CDTSevere Thunderstorm WarningFSD32 min
Aug 13, 6:52 PM CDTSevere Thunderstorm WarningFSD38 min
Aug 27, 4:48 PM CDTMesoscale DiscussionSPC117 min
Aug 27, 10:16 PM CDTMesoscale DiscussionSPC119 min
Sep 25, 3:48 AM CDTMesoscale DiscussionSPC87 min
Oct 1, 9:40 AM CDTFrost AdvisoryFSD23 hr
Oct 12, 3:56 AM CDTWind AdvisoryFSD15 hr
Oct 13, 3:33 PM CDTFreeze WarningFSD17 hr
Oct 15, 3:05 PM CDTFreeze WarningFSD18 hr
Oct 25, 1:41 PM CDTHigh Wind WatchFSD14 hr
Oct 26, 3:49 AM CDTHigh Wind WarningFSD16 hr
Nov 3, 9:57 AM CSTWind AdvisoryFSD8 hr
Nov 5, 2:51 PM CSTMesoscale DiscussionSPC114 min
Nov 5, 7:12 PM CSTSevere Thunderstorm WarningFSD33 min
Nov 6, 3:45 AM CSTWinter Weather AdvisoryFSD38 hr
Nov 10, 11:06 AM CSTWinter Weather AdvisoryFSD27 hr
Nov 10, 7:19 PM CSTMesoscale DiscussionSPC4 hr
Nov 12, 2:50 AM CSTDense Fog AdvisoryFSD7 hr
Dec 2, 3:10 PM CSTWinter Weather AdvisoryFSD12 hr
Dec 8, 4:34 AM CSTWinter Weather AdvisoryFSD23 hr
Dec 13, 4:01 PM CSTWinter Weather AdvisoryFSD32 hr
Dec 14, 3:50 PM CSTWind Chill AdvisoryFSD24 hr
Dec 15, 3:47 PM CSTWinter Weather AdvisoryFSD24 hr
Dec 17, 3:50 AM CSTWinter Storm WatchFSD17 hr
Dec 17, 8:44 PM CSTWinter Weather AdvisoryFSD33 hr
Dec 18, 11:21 AM CSTWinter Storm WarningFSD19 hr
Dec 18, 3:39 PM CSTBlizzard WatchFSD24 hr
Dec 18, 6:37 PM CSTMesoscale DiscussionSPC5 hr
Dec 18, 11:38 PM CSTMesoscale DiscussionSPC4 hr
Dec 19, 4:25 AM CSTWinter Weather AdvisoryFSD32 hr
Dec 19, 4:08 PM CSTBlizzard WarningFSD47 hr
Dec 21, 3:45 AM CSTWind Chill WarningFSD17 hr
Dec 26, 9:06 AM CSTDense Fog AdvisoryFSD4 hr
Dec 26, 12:35 PM CSTDense Fog AdvisoryFSD7 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.