Alert archive / North Dakota / Nelson County

Weather alerts in Nelson County, North Dakota, 2013

127 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Nelson County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts
127
Warnings
20
Watches
23
Advisories
56
Busiest month
December21 alerts
Busiest day
June 20, 20134 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 Nelson County in 2013 had a tornado report inside them.

Nelson County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings4250%450%18 min
Flash flood warnings00

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Grand Forks, ND: tornado warnings17759%1669%20 min
NWS Grand Forks, ND: severe thunderstorm warnings1259921%26474%25 min
NWS Grand Forks, ND: flash flood warnings550%12100%67 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 5, 2:16 AM CSTDense Fog AdvisoryFGF4 hr
Jan 9, 1:11 AM CSTWind AdvisoryFGF5 hr
Jan 9, 3:42 PM CSTWinter Storm WatchFGF36 hr
Jan 11, 4:01 AM CSTBlizzard WarningFGF31 hr
Jan 11, 5:54 PM CSTMesoscale DiscussionSPC6 hr
Jan 12, 10:33 AM CSTWinter Weather AdvisoryFGF5 hr
Jan 12, 3:15 PM CSTWind Chill AdvisoryFGF19 hr
Jan 18, 4:11 AM CSTBlizzard WatchFGF25 hr
Jan 18, 2:43 PM CSTBlizzard WarningFGF30 hr
Jan 19, 3:16 PM CSTWind Chill AdvisoryFGF27 hr
Jan 20, 4:22 AM CSTWind Chill WarningFGF51 hr
Jan 21, 10:51 AM CSTWind Chill AdvisoryFGF24 hr
Jan 22, 3:20 PM CSTWind Chill AdvisoryFGF48 hr
Jan 24, 3:14 PM CSTWinter Weather AdvisoryFGF19 hr
Jan 24, 8:00 PM CSTWind Chill AdvisoryFGF16 hr
Jan 29, 2:40 PM CSTWind Chill AdvisoryFGF38 hr
Jan 30, 3:40 PM CSTWind Chill WarningFGF37 hr
Jan 30, 3:40 PM CSTWind Chill AdvisoryFGF44 hr
Feb 2, 3:14 PM CSTWinter Weather AdvisoryFGF8 hr
Feb 8, 4:17 AM CSTWinter Storm WatchFGF48 hr
Feb 10, 3:58 AM CSTWinter Weather AdvisoryFGF24 hr
Feb 13, 4:49 AM CSTWinter Weather AdvisoryFGF28 hr
Feb 17, 4:48 AM CSTBlizzard WatchFGF17 hr
Feb 17, 3:39 PM CSTBlizzard WarningFGF26 hr
Feb 17, 3:39 PM CSTWinter Weather AdvisoryFGF29 hr
Feb 18, 8:43 PM CSTWind Chill AdvisoryFGF38 hr
Mar 2, 4:02 AM CSTWinter Storm WatchFGF41 hr
Mar 3, 5:05 AM CSTWinter Storm WarningFGF49 hr
Mar 13, 7:21 PM CDTFreezing Rain AdvisoryFGF4 hr
Mar 14, 4:33 AM CDTWinter Storm WatchFGF11 hr
Mar 14, 3:36 PM CDTWinter Weather AdvisoryFGF31 hr
Mar 16, 4:37 AM CDTWinter Storm WatchFGF26 hr
Mar 16, 7:49 PM CDTWinter Storm WarningFGF47 hr
Mar 17, 8:45 PM CDTBlizzard WarningFGF22 hr
Mar 19, 3:31 PM CDTWind Chill AdvisoryFGF18 hr
Mar 28, 5:43 PM CDTDense Fog AdvisoryFGF22 hr
Apr 12, 4:07 AM CDTWinter Storm WatchFGF26 hr
Apr 13, 6:25 AM CDTWinter Storm WarningFGF55 hr
Apr 26, 9:30 AM CDTFlood WatchFGF4 days
Apr 30, 4:21 AM CDTWind AdvisoryFGF15 hr
May 10, 12:57 PM CDTWind AdvisoryFGF8 hr
May 12, 3:37 PM CDTHigh Wind WatchFGF37 hr
May 13, 4:46 AM CDTRed Flag WarningFGF15 hr
May 13, 3:33 PM CDTFire Weather WatchFGF13 hr
May 14, 4:15 AM CDTWind AdvisoryFGF17 hr
May 14, 4:59 AM CDTRed Flag WarningFGF16 hr
May 19, 8:24 PM CDTWind AdvisoryFGF35 hr
May 20, 7:15 AM CDTFlood WatchFGF29 hr
May 31, 9:10 PM CDTWind AdvisoryFGF3 hr
Jun 4, 10:32 AM CDTFlood WatchFGF20 hr
Jun 19, 11:32 PM CDTMesoscale DiscussionSPC88 min
Jun 20, 11:16 AM CDTSpecial Weather StatementFGF44 min
Jun 20, 12:28 PM CDTSpecial Weather StatementFGF62 min
Jun 20, 1:18 PM CDTFlash Flood WatchFGF39 hr
Jun 22, 4:27 AM CDTFlash Flood WatchFGF26 hr
Jun 22, 9:27 PM CDTMesoscale DiscussionSPC63 min
Jun 22, 9:52 PM CDTSevere Thunderstorm WatchSPC4 hr
Jun 25, 2:45 PM CDTMesoscale DiscussionSPC3 hr
Jun 25, 3:49 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 25, 6:21 PM CDTMesoscale DiscussionSPC54 min
Jun 25, 9:00 PM CDTMesoscale DiscussionSPC45 min
Jun 25, 11:21 PM CDTMesoscale DiscussionSPC84 min
Jul 6, 1:42 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 6, 3:23 PM CDTMesoscale DiscussionSPC67 min
Jul 6, 6:19 PM CDTSpecial Weather StatementFGF41 min
Jul 6, 7:00 PM CDTSpecial Weather StatementFGF45 min
Jul 6, 7:33 PM CDTMesoscale DiscussionSPC117 min
Jul 8, 9:31 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 8, 11:43 PM CDTMesoscale DiscussionSPC2 hr
Jul 9, 1:38 AM CDTSpecial Weather StatementFGF52 min
Jul 12, 11:46 PM CDTDense Fog AdvisoryFGF8 hr
Jul 13, 7:57 PM CDTMesoscale DiscussionSPC63 min
Jul 13, 10:49 PM CDTSpecial Weather StatementFGF56 min
Jul 16, 5:59 PM CDTMesoscale DiscussionSPC61 min
Jul 18, 6:49 PM CDTMesoscale DiscussionSPC116 min
Jul 19, 3:43 PM CDTSpecial Weather StatementFGF62 min
Jul 21, 9:59 PM CDTSevere Thunderstorm WarningFGF61 min
Jul 29, 2:46 PM CDTMesoscale DiscussionSPC119 min
Aug 24, 12:38 PM CDTMesoscale DiscussionSPC97 min
Aug 24, 1:13 PM CDTSevere Thunderstorm WatchSPC9 hr
Aug 24, 5:42 PM CDTMesoscale DiscussionSPC93 min
Aug 29, 5:51 AM CDTSevere Thunderstorm WarningFGF54 min
Aug 29, 6:12 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 30, 6:02 AM CDTDense Fog AdvisoryFGF4 hr
Aug 30, 7:02 PM CDTMesoscale DiscussionSPC88 min
Sep 7, 2:44 AM CDTSpecial Weather StatementFGF61 min
Sep 7, 3:10 AM CDTSevere Thunderstorm WarningFGF50 min
Sep 7, 3:58 AM CDTSevere Thunderstorm WarningFGF32 min
Sep 8, 3:30 PM CDTFlood WatchFGF15 hr
Sep 9, 10:44 PM CDTSpecial Weather StatementFGF61 min
Sep 18, 8:27 PM CDTMesoscale DiscussionSPC2 hr
Sep 18, 11:25 PM CDTDense Fog AdvisoryFGF10 hr
Sep 20, 3:42 PM CDTFrost AdvisoryFGF17 hr
Sep 23, 6:16 AM CDTWind AdvisoryFGF9 hr
Sep 30, 3:25 PM CDTWind AdvisoryFGF27 hr
Oct 1, 9:09 PM CDTFrost AdvisoryFGF9 hr
Oct 5, 3:45 PM CDTFrost AdvisoryFGF17 hr
Oct 11, 2:49 PM CDTMesoscale DiscussionSPC86 min
Oct 11, 5:35 PM CDTTornado WarningFGF25 min
Oct 12, 3:15 AM CDTWind AdvisoryFGF8 hr
Oct 12, 3:40 PM CDTFrost AdvisoryFGF18 hr
Oct 19, 4:07 AM CDTWinter Weather AdvisoryFGF33 hr
Oct 25, 10:02 AM CDTWind AdvisoryFGF12 hr
Nov 9, 10:05 AM CSTWind AdvisoryFGF8 hr
Nov 20, 8:42 PM CSTWinter Weather AdvisoryFGF7 hr
Nov 22, 3:33 PM CSTWind Chill AdvisoryFGF18 hr
Dec 1, 10:11 AM CSTDense Fog AdvisoryFGF3 hr
Dec 1, 3:46 PM CSTWinter Storm WatchFGF37 hr
Dec 1, 3:46 PM CSTWinter Weather AdvisoryFGF37 hr
Dec 3, 4:54 AM CSTWinter Storm WarningFGF49 hr
Dec 5, 3:58 AM CSTWind Chill AdvisoryFGF3 days
Dec 6, 3:29 PM CSTWind Chill WarningFGF21 hr
Dec 8, 3:06 PM CSTWind Chill AdvisoryFGF22 hr
Dec 9, 3:24 PM CSTWind Chill AdvisoryFGF20 hr
Dec 10, 2:24 PM CSTWind Chill AdvisoryFGF25 hr
Dec 12, 3:27 PM CSTWind Chill AdvisoryFGF30 hr
Dec 17, 3:20 AM CSTWind AdvisoryFGF4 hr
Dec 18, 3:39 PM CSTWind Chill AdvisoryFGF20 hr
Dec 18, 3:39 PM CSTWinter Weather AdvisoryFGF8 hr
Dec 18, 11:53 PM CSTWind Chill AdvisoryFGF12 hr
Dec 19, 3:40 PM CSTWind Chill AdvisoryFGF15 hr
Dec 21, 3:20 AM CSTWind Chill AdvisoryFGF3 days
Dec 28, 4:10 AM CSTWinter Weather AdvisoryFGF17 hr
Dec 28, 10:21 AM CSTBlizzard WarningFGF11 hr
Dec 28, 6:46 PM CSTWind Chill WarningFGF17 hr
Dec 29, 11:51 AM CSTWind Chill AdvisoryFGF10 hr
Dec 30, 9:58 AM CSTWind Chill AdvisoryFGF32 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 archive20122014

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.