Alert archive / Colorado / Boulder County

Weather alerts in Boulder County, Colorado, 2021

127 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Boulder County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
127
Warnings
36
Watches
29
Advisories
46
Busiest month
December25 alerts
Busiest day
July 31, 20218 alerts

Over time

By month

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 11, 8:11 PM MSTHigh Wind WatchBOU30 hr
Jan 13, 1:46 AM MSTHigh Wind WarningBOU63 hr
Jan 19, 2:28 PM MSTHigh Wind WarningBOU27 hr
Feb 2, 3:09 AM MSTWinter Weather AdvisoryBOU53 hr
Feb 3, 3:27 PM MSTWinter Storm WarningBOU17 hr
Feb 4, 2:39 PM MSTWinter Weather AdvisoryBOU38 hr
Feb 6, 3:42 AM MSTWinter Weather AdvisoryBOU37 hr
Feb 6, 3:47 AM MSTHigh Wind WatchBOU8 hr
Feb 6, 11:18 AM MSTHigh Wind WarningBOU30 hr
Feb 8, 2:37 PM MSTWinter Weather AdvisoryBOU44 hr
Feb 11, 4:10 AM MSTWinter Weather AdvisoryBOU49 hr
Feb 11, 1:45 PM MSTWind Chill AdvisoryBOU4 days
Feb 12, 8:46 PM MSTWinter Weather AdvisoryBOU40 hr
Feb 17, 5:20 PM MSTWinter Weather AdvisoryBOU10 hr
Feb 19, 2:08 PM MSTWinter Weather AdvisoryBOU39 hr
Feb 23, 2:35 PM MSTWinter Weather AdvisoryBOU43 hr
Feb 24, 10:19 PM MSTWinter Storm WarningBOU10 hr
Mar 3, 2:40 PM MSTWinter Weather AdvisoryBOU33 hr
Mar 9, 2:40 AM MSTWinter Weather AdvisoryBOU38 hr
Mar 10, 2:40 PM MSTWinter Storm WatchBOU48 hr
Mar 11, 2:29 PM MSTWinter Storm WarningBOU4 days
Mar 13, 12:22 PM MSTMesoscale DiscussionSPC4 hr
Mar 13, 7:15 PM MSTMesoscale DiscussionSPC6 hr
Mar 13, 7:39 PM MSTMesoscale DiscussionSPC6 hr
Mar 14, 1:55 AM MSTMesoscale DiscussionSPC6 hr
Mar 14, 9:21 AM MDTMesoscale DiscussionSPC4 hr
Mar 14, 12:19 PM MDTBlizzard WarningBOU12 hr
Mar 15, 3:07 PM MDTDense Fog AdvisoryBOU19 hr
Mar 20, 2:11 PM MDTWinter Storm WatchBOU13 hr
Mar 20, 2:11 PM MDTWinter Storm WarningBOU44 hr
Mar 21, 2:43 AM MDTWinter Weather AdvisoryBOU31 hr
Mar 28, 2:08 PM MDTHigh Wind WatchBOU19 hr
Mar 28, 8:44 PM MDTHigh Wind WarningBOU19 hr
Apr 13, 2:55 AM MDTWinter Weather AdvisoryBOU27 hr
Apr 14, 3:03 PM MDTWinter Weather AdvisoryBOU45 hr
Apr 18, 4:35 AM MDTWinter Storm WatchBOU9 hr
Apr 18, 1:56 PM MDTWinter Weather AdvisoryBOU37 hr
Apr 19, 4:26 AM MDTWinter Storm WarningBOU23 hr
Apr 21, 7:03 PM MDTWinter Weather AdvisoryBOU100 min
Apr 26, 3:10 PM MDTWinter Storm WatchBOU12 hr
Apr 27, 3:16 AM MDTWinter Storm WarningBOU30 hr
May 1, 3:56 AM MDTWinter Storm WatchBOU24 hr
May 2, 3:42 AM MDTWinter Storm WarningBOU34 hr
May 2, 10:14 AM MDTMesoscale DiscussionSPC2 hr
May 2, 10:36 AM MDTSpecial Weather StatementBOU24 min
May 2, 2:19 PM MDTWinter Weather AdvisoryBOU23 hr
May 2, 5:47 PM MDTAreal Flood AdvisoryBOU88 min
May 9, 3:40 AM MDTWinter Storm WatchBOU11 hr
May 9, 2:19 PM MDTWinter Storm WarningBOU52 hr
May 17, 3:45 PM MDTAreal Flood AdvisoryBOU75 min
May 17, 3:49 PM MDTSpecial Weather StatementBOU41 min
May 29, 1:34 PM MDTSpecial Weather StatementBOU26 min
Jun 13, 12:08 PM MDTMesoscale DiscussionSPC97 min
Jun 14, 2:51 PM MDTMesoscale DiscussionSPC114 min
Jun 25, 1:32 PM MDTAreal Flood AdvisoryBOU88 min
Jun 25, 1:59 PM MDTSevere Thunderstorm WarningBOU46 min
Jun 26, 1:06 PM MDTAreal Flood AdvisoryBOU84 min
Jun 27, 5:35 PM MDTAreal Flood AdvisoryBOU25 min
Jun 27, 5:56 PM MDTFlash Flood WarningBOU94 min
Jul 1, 8:46 AM MDTFlash Flood WatchBOU12 hr
Jul 1, 2:52 PM MDTAreal Flood AdvisoryBOU83 min
Jul 1, 3:17 PM MDTAreal Flood AdvisoryBOU88 min
Jul 1, 3:36 PM MDTSpecial Weather StatementBOU24 min
Jul 1, 4:03 PM MDTAreal Flood AdvisoryBOU87 min
Jul 5, 3:13 AM MDTFlash Flood WatchBOU21 hr
Jul 6, 9:08 PM MDTAreal Flood AdvisoryBOU52 min
Jul 21, 3:18 AM MDTFlash Flood WatchBOU17 hr
Jul 22, 2:15 PM MDTFlash Flood WatchBOU30 hr
Jul 23, 2:30 PM MDTSpecial Weather StatementBOU30 min
Jul 25, 7:10 PM MDTAreal Flood AdvisoryBOU95 min
Jul 29, 2:03 PM MDTFlash Flood WatchBOU55 hr
Jul 30, 6:01 PM MDTAreal Flood AdvisoryBOU59 min
Jul 30, 7:35 PM MDTAreal Flood AdvisoryBOU70 min
Jul 30, 7:52 PM MDTAreal Flood AdvisoryBOU83 min
Jul 30, 9:34 PM MDTAreal Flood AdvisoryBOU56 min
Jul 30, 10:18 PM MDTFlash Flood WarningBOU3 hr
Jul 31, 3:29 PM MDTAreal Flood AdvisoryBOU91 min
Jul 31, 3:37 PM MDTFlash Flood WarningBOU3 hr
Jul 31, 3:51 PM MDTAreal Flood AdvisoryBOU84 min
Aug 1, 2:04 PM MDTFlash Flood WatchBOU32 hr
Aug 2, 5:08 PM MDTAreal Flood AdvisoryBOU82 min
Aug 2, 5:40 PM MDTAreal Flood AdvisoryBOU95 min
Aug 3, 3:41 AM MDTFlash Flood WatchBOU18 hr
Aug 3, 8:51 PM MDTAreal Flood AdvisoryBOU114 min
Aug 13, 5:40 PM MDTMesoscale DiscussionSPC2 hr
Aug 19, 2:24 PM MDTSevere Thunderstorm Warning Considerable damage threatBOU36 min
Aug 26, 9:55 PM MDTSpecial Weather StatementBOU50 min
Sep 15, 2:31 PM MDTFire Weather WatchBOU37 hr
Sep 15, 2:31 PM MDTRed Flag WarningBOU28 hr
Sep 29, 1:59 PM MDTAreal Flood AdvisoryBOU114 min
Oct 11, 2:55 PM MDTWinter Weather AdvisoryBOU39 hr
Oct 12, 3:56 AM MDTHigh Wind WatchBOU11 hr
Oct 12, 2:47 PM MDTHigh Wind WarningBOU24 hr
Oct 12, 9:53 PM MDTFreeze WarningBOU10 hr
Oct 13, 4:40 PM MDTFrost AdvisoryBOU15 hr
Oct 14, 3:01 AM MDTFreeze WarningBOU30 hr
Nov 1, 9:09 AM MDTWinter Weather AdvisoryBOU36 hr
Nov 15, 1:21 PM MSTRed Flag WarningBOU28 hr
Nov 17, 4:58 AM MSTFire Weather WatchBOU9 hr
Nov 17, 2:16 PM MSTRed Flag WarningBOU39 hr
Nov 22, 2:17 AM MSTFire Weather WatchBOU25 hr
Nov 22, 2:40 PM MSTRed Flag WarningBOU26 hr
Dec 4, 2:49 AM MSTHigh Wind WatchBOU12 hr
Dec 4, 2:41 PM MSTHigh Wind WarningBOU20 hr
Dec 5, 3:21 AM MSTRed Flag WarningBOU12 hr
Dec 7, 1:47 PM MSTWinter Storm WatchBOU22 hr
Dec 8, 11:25 AM MSTWinter Storm WarningBOU54 hr
Dec 8, 11:25 AM MSTWinter Weather AdvisoryBOU54 hr
Dec 10, 4:05 AM MSTHigh Wind WatchBOU10 hr
Dec 10, 1:56 PM MSTHigh Wind WarningBOU37 hr
Dec 13, 2:20 PM MSTHigh Wind WatchBOU14 hr
Dec 14, 4:34 AM MSTHigh Wind WarningBOU36 hr
Dec 14, 11:54 AM MSTWinter Weather AdvisoryBOU32 hr
Dec 14, 12:17 PM MSTRed Flag WarningBOU29 hr
Dec 15, 7:47 AM MSTSpecial Weather StatementBOU43 min
Dec 20, 1:08 PM MSTRed Flag WarningBOU28 hr
Dec 22, 2:47 AM MSTWinter Storm WatchBOU12 hr
Dec 22, 3:11 AM MSTRed Flag WarningBOU14 hr
Dec 22, 2:33 PM MSTWinter Storm WarningBOU68 hr
Dec 22, 2:33 PM MSTWinter Weather AdvisoryBOU66 hr
Dec 25, 3:46 AM MSTWinter Storm WatchBOU10 hr
Dec 25, 1:48 PM MSTWinter Weather AdvisoryBOU66 hr
Dec 28, 1:44 PM MSTHigh Wind WatchBOU24 hr
Dec 28, 1:59 PM MSTWinter Storm WatchBOU23 hr
Dec 29, 1:18 PM MSTWinter Storm WarningBOU70 hr
Dec 29, 1:36 PM MSTHigh Wind WarningBOU30 hr
Dec 30, 3:00 AM MSTWinter Storm WatchBOU11 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

ProductAlerts
Severe storms
Severe Thunderstorm Warning2
Mesoscale Discussion9
Special Weather Statement7
Flooding
Flash Flood Warning3
Flash Flood Watch7
Areal Flood Advisory20
Winter
Blizzard Warning1
Winter Storm Warning11
Winter Storm Watch11
Winter Weather Advisory23
Cold
Freeze Warning2
Frost Advisory1
Wind Chill Advisory1
Wind and dust
High Wind Warning9
High Wind Watch8
Fire
Red Flag Warning8
Fire Weather Watch3
Fog and smoke
Dense Fog Advisory1

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 31, 20218alerts
  2. March 14, 20215alerts
  3. May 2, 20215alerts
  4. July 1, 20215alerts
  5. December 22, 20214alerts
  6. February 6, 20213alerts
  7. December 14, 20213alerts
  8. February 11, 20212alerts
  9. March 20, 20212alerts
  10. April 18, 20212alerts

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20202022

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. Rebuilt daily.