Alert archive / Colorado / Grand County

Weather alerts in Grand County, Colorado, 2014

71 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grand County and its neighbors

Each county as a circle sized by its count in 2014. Tap one for its archive.

Alerts
71
Warnings
15
Watches
13
Advisories
40
Busiest month
February16 alerts
Busiest day
January 28, 20143 alerts

Over time

By month

Warning verification

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

Grand County, 2014

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

Each office's whole area, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Denver/Boulder, CO: tornado warnings832372%5663%13 min
NWS Denver/Boulder, CO: severe thunderstorm warnings2779466%29363%16 min
NWS Denver/Boulder, CO: flash flood warnings41978%2259%33 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 3, 4:10 AM MSTWinter Storm WarningBOU48 hr
Jan 3, 4:10 AM MSTWinter Weather AdvisoryBOU48 hr
Jan 8, 3:21 PM MSTWinter Storm WatchBOU13 hr
Jan 9, 4:31 AM MSTWinter Weather AdvisoryBOU61 hr
Jan 11, 4:08 AM MSTWinter Storm WatchBOU9 hr
Jan 11, 12:41 PM MSTWinter Storm WarningBOU51 hr
Jan 12, 3:22 AM MSTWinter Weather AdvisoryBOU17 hr
Jan 13, 4:06 PM MSTWinter Weather AdvisoryBOU29 hr
Jan 28, 3:14 AM MSTWinter Storm WatchBOU12 hr
Jan 28, 3:36 PM MSTWinter Storm WatchBOU14 hr
Jan 28, 3:36 PM MSTWinter Storm WarningBOU61 hr
Jan 31, 11:08 AM MSTWinter Weather AdvisoryBOU18 hr
Feb 6, 3:24 PM MSTWinter Storm WatchBOU15 hr
Feb 7, 6:31 AM MSTWinter Storm WarningBOU70 hr
Feb 7, 4:00 PM MSTWinter Weather AdvisoryBOU52 hr
Feb 10, 4:34 AM MSTWinter Weather AdvisoryBOU7 hr
Feb 11, 4:02 AM MSTWinter Storm WatchBOU24 hr
Feb 12, 3:51 AM MSTWinter Weather AdvisoryBOU43 hr
Feb 14, 7:14 AM MSTHigh Wind WarningBOU29 hr
Feb 14, 4:05 PM MSTWinter Weather AdvisoryBOU16 hr
Feb 16, 4:56 AM MSTWinter Weather AdvisoryBOU19 hr
Feb 17, 4:23 AM MSTHigh Wind WatchBOU8 hr
Feb 17, 12:08 PM MSTHigh Wind WarningBOU22 hr
Feb 18, 2:07 PM MSTWinter Weather AdvisoryBOU39 hr
Feb 20, 6:23 AM MSTHigh Wind WarningBOU23 hr
Feb 22, 9:51 AM MSTWinter Weather AdvisoryBOU20 hr
Feb 27, 3:49 AM MSTWinter Weather AdvisoryBOU24 hr
Feb 28, 4:01 PM MSTWinter Weather AdvisoryBOU26 hr
Mar 6, 4:58 AM MSTWinter Weather AdvisoryBOU45 hr
Mar 7, 5:06 AM MSTWinter Storm WarningBOU21 hr
Mar 17, 4:32 AM MDTWinter Weather AdvisoryBOU34 hr
Mar 26, 4:37 AM MDTWinter Weather AdvisoryBOU25 hr
Mar 30, 4:25 AM MDTWinter Weather AdvisoryBOU30 hr
Apr 11, 2:50 PM MDTWinter Storm WatchBOU25 hr
Apr 12, 3:51 PM MDTWinter Storm WarningBOU32 hr
Apr 12, 3:51 PM MDTWinter Weather AdvisoryBOU32 hr
Apr 25, 2:20 PM MDTWinter Storm WatchBOU16 hr
Apr 26, 6:01 AM MDTWinter Storm WarningBOU39 hr
Apr 26, 6:01 AM MDTWinter Weather AdvisoryBOU23 hr
Apr 27, 4:42 AM MDTWinter Weather AdvisoryBOU8 hr
Apr 27, 12:34 PM MDTWinter Weather AdvisoryBOU8 hr
May 5, 5:42 PM MDTAreal Flood AdvisoryBOU48 hr
May 9, 4:30 AM MDTWinter Storm WatchBOU49 hr
May 10, 6:00 AM MDTWinter Storm WarningBOU54 hr
May 24, 4:42 PM MDTSpecial Weather StatementBOU33 min
May 25, 9:48 AM MDTAreal Flood AdvisoryBOU6 days
May 30, 9:16 PM MDTAreal Flood AdvisoryBOU60 hr
Jun 2, 9:29 AM MDTAreal Flood AdvisoryBOU60 hr
Jun 4, 9:33 PM MDTAreal Flood AdvisoryBOU4 days
Jun 25, 1:28 PM MDTMesoscale DiscussionSPC2 hr
Jul 15, 1:29 PM MDTMesoscale DiscussionSPC3 hr
Jul 28, 1:22 PM MDTFlash Flood WarningBOU3 hr
Jul 28, 1:37 PM MDTFlash Flood WatchBOU52 hr
Jul 30, 1:53 AM MDTAreal Flood AdvisoryBOU112 min
Oct 1, 3:19 AM MDTWinter Weather AdvisoryBOU21 hr
Oct 9, 4:30 AM MDTWinter Weather AdvisoryBOU24 hr
Oct 11, 2:39 PM MDTWinter Weather AdvisoryBOU33 hr
Nov 2, 5:49 AM MSTWinter Weather AdvisoryBOU31 hr
Nov 12, 2:35 AM MSTWinter Weather AdvisoryBOU15 hr
Nov 12, 5:12 PM MSTWinter Weather AdvisoryBOU35 hr
Nov 14, 4:39 AM MSTWinter Weather AdvisoryBOU38 hr
Nov 15, 10:17 AM MSTWinter Storm WarningBOU12 hr
Nov 21, 4:06 AM MSTWinter Storm WatchBOU16 hr
Nov 21, 7:50 PM MSTWinter Storm WarningBOU69 hr
Nov 22, 10:25 AM MSTWinter Weather AdvisoryBOU23 hr
Nov 24, 3:30 PM MSTWinter Weather AdvisoryBOU45 hr
Dec 13, 2:07 PM MSTWinter Weather AdvisoryBOU39 hr
Dec 19, 12:55 PM MSTWinter Storm WatchBOU26 hr
Dec 20, 10:12 AM MSTWinter Storm WarningBOU62 hr
Dec 24, 2:38 PM MSTWinter Weather AdvisoryBOU37 hr
Dec 28, 10:36 AM MSTWinter Weather AdvisoryBOU43 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 archive20132015

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.