Alert archive / Colorado / Broomfield County

Weather alerts in Broomfield County, Colorado, 2012

70 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Broomfield County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
70
Warnings
22
Watches
18
Advisories
7
Busiest month
May15 alerts
Busiest day
May 2, 201211 alerts

Over time

By month

Warning verification

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

Broomfield County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings20100%20%
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Denver/Boulder, CO: tornado warnings24771%1747%23 min
NWS Denver/Boulder, CO: severe thunderstorm warnings953959%12858%20 min
NWS Denver/Boulder, CO: flash flood warnings26773%1250%62 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 16, 2:36 PM MSTHigh Wind WatchBOU36 hr
Jan 17, 9:57 AM MSTHigh Wind WarningBOU50 hr
Feb 1, 4:09 AM MSTWinter Storm WatchBOU25 hr
Feb 2, 5:07 AM MSTWinter Storm WarningBOU47 hr
Feb 2, 5:08 PM MSTMesoscale DiscussionSPC4 hr
Feb 21, 4:17 AM MSTHigh Wind WarningBOU48 hr
Feb 23, 4:37 AM MSTWinter Weather AdvisoryBOU6 hr
Feb 27, 2:16 PM MSTHigh Wind WatchBOU19 hr
Feb 29, 3:12 PM MSTWinter Weather AdvisoryBOU38 hr
Mar 5, 11:39 PM MSTRed Flag WarningBOU18 hr
Mar 16, 4:10 AM MDTFire Weather WatchBOU11 hr
Mar 16, 3:07 PM MDTRed Flag WarningBOU29 hr
Mar 17, 7:38 PM MDTRed Flag WarningBOU26 hr
Mar 24, 2:09 PM MDTFire Weather WatchBOU22 hr
Mar 25, 12:15 PM MDTRed Flag WarningBOU33 hr
Apr 5, 4:05 AM MDTFire Weather WatchBOU12 hr
Apr 5, 3:38 PM MDTRed Flag WarningBOU28 hr
Apr 26, 8:41 PM MDTMesoscale DiscussionSPC2 hr
May 2, 2:03 PM MDTSpecial Weather StatementBOU27 min
May 2, 2:06 PM MDTSpecial Weather StatementBOU24 min
May 2, 2:09 PM MDTSpecial Weather StatementBOU21 min
May 2, 2:28 PM MDTSpecial Weather StatementBOU7 min
May 2, 2:30 PM MDTSpecial Weather StatementBOU5 min
May 2, 3:00 PM MDTSpecial Weather StatementBOU2 hr
May 2, 3:02 PM MDTSpecial Weather StatementBOU2 hr
May 2, 3:53 PM MDTSpecial Weather StatementBOU77 min
May 2, 3:59 PM MDTSpecial Weather StatementBOU11 min
May 2, 4:05 PM MDTSpecial Weather StatementBOU5 min
May 2, 5:35 PM MDTSpecial Weather StatementBOU5 min
May 17, 2:36 PM MDTFire Weather WatchBOU13 hr
May 18, 4:05 AM MDTRed Flag WarningBOU16 hr
May 25, 4:01 AM MDTHigh Wind WatchBOU23 hr
May 26, 2:39 AM MDTHigh Wind WarningBOU17 hr
Jun 3, 1:03 PM MDTMesoscale DiscussionSPC2 hr
Jun 6, 12:54 PM MDTMesoscale DiscussionSPC2 hr
Jun 6, 3:01 PM MDTTornado WatchSPC8 hr
Jun 6, 6:47 PM MDTMesoscale DiscussionSPC58 min
Jun 6, 8:37 PM MDTMesoscale DiscussionSPC23 min
Jun 7, 10:47 AM MDTFlash Flood WatchBOU13 hr
Jun 7, 11:46 AM MDTTornado WatchSPC10 hr
Jun 7, 1:59 PM MDTMesoscale DiscussionSPC91 min
Jun 7, 5:52 PM MDTMesoscale DiscussionSPC53 min
Jun 16, 3:58 AM MDTFire Weather WatchBOU10 hr
Jun 16, 2:02 PM MDTRed Flag WarningBOU30 hr
Jun 17, 4:37 AM MDTRed Flag WarningBOU40 hr
Jun 21, 3:16 PM MDTRed Flag WarningBOU54 hr
Jun 24, 2:54 PM MDTRed Flag WarningBOU30 hr
Jun 27, 1:25 PM MDTMesoscale DiscussionSPC3 hr
Jul 6, 8:41 PM MDTFlash Flood WatchBOU32 hr
Jul 8, 5:05 AM MDTFlash Flood WatchBOU18 hr
Jul 31, 1:03 PM MDTSpecial Weather StatementBOU27 min
Jul 31, 2:05 PM MDTMesoscale DiscussionSPC55 min
Aug 11, 6:50 PM MDTSevere Thunderstorm WarningBOU26 min
Aug 11, 7:11 PM MDTSevere Thunderstorm WarningBOU19 min
Aug 31, 9:15 AM MDTRed Flag WarningBOU11 hr
Sep 3, 5:42 PM MDTSpecial Weather StatementBOU63 min
Sep 8, 2:44 PM MDTFire Weather WatchBOU13 hr
Oct 3, 11:26 AM MDTRed Flag WarningBOU7 hr
Oct 3, 8:26 PM MDTFreeze WarningBOU13 hr
Oct 4, 4:21 PM MDTFrost AdvisoryBOU17 hr
Oct 4, 4:21 PM MDTFreeze WatchBOU13 hr
Oct 5, 5:03 AM MDTFreeze WarningBOU29 hr
Oct 5, 2:59 PM MDTHard Freeze WarningBOU42 hr
Oct 16, 3:52 AM MDTFire Weather WatchBOU12 hr
Oct 16, 3:49 PM MDTRed Flag WarningBOU26 hr
Nov 9, 4:02 AM MSTWinter Weather AdvisoryBOU49 hr
Dec 16, 4:32 AM MSTDense Fog AdvisoryBOU4 hr
Dec 17, 3:36 PM MSTWinter Storm WatchBOU22 hr
Dec 18, 1:56 PM MSTWinter Weather AdvisoryBOU25 hr
Dec 19, 3:13 AM MSTWinter Weather AdvisoryBOU12 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 archive20112013

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.