Alert archive / Massachusetts / Franklin County

Weather alerts in Franklin County, Massachusetts, 2009

135 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Franklin County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
135
Warnings
34
Watches
24
Advisories
52
Busiest month
July38 alerts
Busiest day
August 21, 200910 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 reports fell inside a warning.

Franklin County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings010%
Severe thunderstorm warnings151127%888%16 min
Flash flood warnings30100%0

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boston/Norton, MA: tornado warnings20100%20%
NWS Boston/Norton, MA: severe thunderstorm warnings1146642%25078%21 min
NWS Boston/Norton, MA: flash flood warnings22386%1362%68 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 5, 3:33 PM ESTWinter Storm WatchBOX24 hr
Jan 6, 4:53 AM ESTWinter Storm WarningBOX47 hr
Jan 7, 12:10 AM ESTMesoscale DiscussionSPC4 hr
Jan 7, 6:08 AM ESTMesoscale DiscussionSPC3 hr
Jan 7, 11:39 AM ESTMesoscale DiscussionSPC6 hr
Jan 9, 4:25 AM ESTWinter Storm WatchBOX24 hr
Jan 10, 4:39 AM ESTWinter Storm WarningBOX30 hr
Jan 10, 7:58 PM ESTMesoscale DiscussionSPC4 hr
Jan 17, 4:22 PM ESTWinter Storm WarningBOX22 hr
Jan 17, 4:22 PM ESTWinter Weather AdvisoryBOX22 hr
Jan 26, 3:35 PM ESTWinter Storm WatchBOX24 hr
Jan 27, 3:28 AM ESTWinter Storm WarningBOX45 hr
Jan 28, 7:53 AM ESTMesoscale DiscussionSPC5 hr
Jan 28, 12:24 PM ESTMesoscale DiscussionSPC4 hr
Feb 4, 4:06 PM ESTWind Chill AdvisoryBOX16 hr
Feb 11, 3:48 PM ESTWind AdvisoryBOX36 hr
Feb 18, 4:21 AM ESTWinter Weather AdvisoryBOX24 hr
Feb 18, 6:28 PM ESTMesoscale DiscussionSPC4 hr
Feb 21, 4:35 AM ESTWinter Storm WatchBOX12 hr
Feb 21, 4:26 PM ESTWinter Storm WarningBOX31 hr
Feb 28, 5:07 AM ESTWinter Storm WatchBOX36 hr
Mar 1, 4:27 AM ESTWinter Storm WarningBOX35 hr
Mar 1, 4:43 PM ESTWinter Weather AdvisoryBOX26 hr
Mar 8, 3:59 PM EDTWinter Weather AdvisoryBOX26 hr
Apr 16, 4:50 PM EDTFire Weather WatchBOX11 hr
Apr 17, 4:11 AM EDTRed Flag WarningBOX16 hr
Apr 27, 4:40 PM EDTFire Weather WatchBOX12 hr
Apr 28, 4:26 AM EDTRed Flag WarningBOX17 hr
Apr 29, 4:36 PM EDTFire Weather WatchBOX12 hr
Apr 30, 4:54 AM EDTRed Flag WarningBOX14 hr
May 9, 3:40 PM EDTSevere Thunderstorm WatchSPC6 hr
May 9, 6:27 PM EDTSevere Thunderstorm WarningBOX35 min
May 9, 6:40 PM EDTSevere Thunderstorm WarningBOX28 min
May 9, 6:47 PM EDTMesoscale DiscussionSPC88 min
May 9, 6:58 PM EDTSevere Thunderstorm WarningBOX47 min
May 9, 7:21 PM EDTSevere Thunderstorm WarningBOX39 min
May 9, 8:16 PM EDTSevere Thunderstorm WarningBOX44 min
May 13, 4:21 PM EDTWind AdvisoryBOX27 hr
May 18, 4:18 AM EDTFreeze WarningBOX27 hr
May 20, 4:12 PM EDTFire Weather WatchBOX12 hr
May 21, 3:47 AM EDTRed Flag WarningBOX16 hr
May 24, 11:49 AM EDTMesoscale DiscussionSPC116 min
May 25, 4:01 AM EDTFrost AdvisoryBOX27 hr
May 31, 4:16 AM EDTFrost AdvisoryBOX27 hr
May 31, 4:16 AM EDTFreeze WarningBOX27 hr
Jun 12, 2:43 AM EDTAreal Flood AdvisoryBOX107 min
Jun 12, 4:44 AM EDTAreal Flood AdvisoryBOX106 min
Jun 13, 8:41 PM EDTAreal Flood AdvisoryBOX85 min
Jun 13, 9:21 PM EDTFlash Flood WarningBOX2 hr
Jun 13, 11:48 PM EDTAreal Flood AdvisoryBOX3 hr
Jun 19, 4:35 PM EDTFlood WatchBOX36 hr
Jun 27, 5:41 AM EDTDense Fog AdvisoryBOX2 hr
Jun 27, 4:40 PM EDTAreal Flood AdvisoryBOX100 min
Jun 27, 9:39 PM EDTAreal Flood AdvisoryBOX111 min
Jun 30, 7:13 PM EDTAreal Flood AdvisoryBOX3 hr
Jun 30, 7:24 PM EDTSevere Thunderstorm WarningBOX36 min
Jun 30, 7:38 PM EDTAreal Flood AdvisoryBOX3 hr
Jun 30, 7:52 PM EDTFlash Flood WarningBOX83 min
Jun 30, 8:51 PM EDTAreal Flood AdvisoryBOX78 min
Jun 30, 9:19 PM EDTSevere Thunderstorm WarningBOX26 min
Jun 30, 9:42 PM EDTSevere Thunderstorm WarningBOX33 min
Jul 1, 4:54 AM EDTFlash Flood WatchBOX42 hr
Jul 2, 5:17 AM EDTAreal Flood AdvisoryBOX3 hr
Jul 2, 3:20 PM EDTMesoscale DiscussionSPC55 min
Jul 3, 4:08 AM EDTFlash Flood WatchBOX16 hr
Jul 7, 8:59 AM EDTMesoscale DiscussionSPC3 hr
Jul 7, 11:05 AM EDTSevere Thunderstorm WatchSPC8 hr
Jul 7, 1:05 PM EDTSevere Thunderstorm WarningBOX40 min
Jul 7, 1:26 PM EDTFlash Flood WarningBOX94 min
Jul 7, 2:00 PM EDTMesoscale DiscussionSPC90 min
Jul 7, 2:02 PM EDTSevere Thunderstorm WarningBOX58 min
Jul 7, 4:41 PM EDTMesoscale DiscussionSPC2 hr
Jul 16, 6:16 PM EDTMesoscale DiscussionSPC59 min
Jul 16, 7:42 PM EDTMesoscale DiscussionSPC33 min
Jul 18, 12:34 AM EDTAreal Flood AdvisoryBOX3 hr
Jul 23, 2:54 PM EDTFlood WatchBOX19 hr
Jul 24, 3:07 AM EDTAreal Flood AdvisoryBOX4 hr
Jul 26, 4:38 AM EDTFlash Flood WatchBOX24 hr
Jul 26, 1:13 PM EDTMesoscale DiscussionSPC2 hr
Jul 26, 3:51 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 26, 6:37 PM EDTMesoscale DiscussionSPC113 min
Jul 26, 9:09 PM EDTSevere Thunderstorm WarningBOX36 min
Jul 27, 2:20 PM EDTMesoscale DiscussionSPC55 min
Jul 27, 9:20 PM EDTAreal Flood AdvisoryBOX100 min
Jul 29, 4:10 AM EDTFlash Flood WatchBOX24 hr
Jul 29, 12:22 PM EDTMesoscale DiscussionSPC23 min
Jul 29, 12:49 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 29, 2:22 PM EDTMesoscale DiscussionSPC23 min
Jul 29, 5:05 PM EDTMesoscale DiscussionSPC55 min
Jul 29, 8:23 PM EDTAreal Flood AdvisoryBOX4 hr
Jul 30, 12:50 AM EDTAreal Flood AdvisoryBOX3 hr
Jul 30, 3:57 AM EDTAreal Flood AdvisoryBOX3 hr
Jul 31, 10:24 AM EDTAreal Flood AdvisoryBOX3 hr
Jul 31, 12:47 PM EDTFlash Flood WatchBOX5 hr
Jul 31, 1:23 PM EDTAreal Flood AdvisoryBOX3 hr
Jul 31, 2:47 PM EDTAreal Flood AdvisoryBOX3 hr
Aug 5, 1:50 PM EDTSevere Thunderstorm WarningBOX55 min
Aug 5, 2:14 PM EDTAreal Flood AdvisoryBOX75 min
Aug 5, 2:16 PM EDTMesoscale DiscussionSPC59 min
Aug 21, 10:01 AM EDTMesoscale DiscussionSPC119 min
Aug 21, 10:47 AM EDTSevere Thunderstorm WatchSPC7 hr
Aug 21, 1:58 PM EDTMesoscale DiscussionSPC92 min
Aug 21, 3:45 PM EDTSevere Thunderstorm WarningBOX60 min
Aug 21, 4:22 PM EDTTornado WatchSPC3 hr
Aug 21, 4:34 PM EDTAreal Flood AdvisoryBOX116 min
Aug 21, 4:45 PM EDTSevere Thunderstorm WarningBOX60 min
Aug 21, 5:38 PM EDTSevere Thunderstorm WarningBOX67 min
Aug 21, 5:55 PM EDTMesoscale DiscussionSPC80 min
Aug 21, 6:02 PM EDTAreal Flood AdvisoryBOX118 min
Aug 22, 5:16 PM EDTAreal Flood AdvisoryBOX119 min
Aug 23, 2:05 PM EDTAreal Flood AdvisoryBOX115 min
Aug 23, 6:44 PM EDTAreal Flood AdvisoryBOX2 hr
Sep 19, 2:49 AM EDTFrost AdvisoryBOX29 hr
Sep 25, 4:38 AM EDTFrost AdvisoryBOX27 hr
Sep 25, 4:23 PM EDTFreeze WarningBOX16 hr
Oct 6, 3:28 PM EDTWind AdvisoryBOX36 hr
Oct 10, 3:08 AM EDTFrost AdvisoryBOX29 hr
Oct 11, 3:05 AM EDTFreeze WarningBOX29 hr
Oct 18, 4:42 AM EDTWinter Weather AdvisoryBOX19 hr
Nov 27, 4:10 AM ESTWind AdvisoryBOX34 hr
Nov 28, 8:40 AM ESTHigh Wind WarningBOX6 hr
Dec 2, 4:25 PM ESTWind AdvisoryBOX18 hr
Dec 3, 5:38 AM ESTAreal Flood AdvisoryBOX112 min
Dec 5, 4:36 AM ESTWinter Weather AdvisoryBOX22 hr
Dec 8, 3:14 AM ESTWinter Storm WatchBOX13 hr
Dec 8, 3:59 PM ESTWinter Storm WarningBOX21 hr
Dec 8, 3:59 PM ESTWinter Weather AdvisoryBOX19 hr
Dec 9, 1:15 PM ESTWinter Weather AdvisoryBOX3 hr
Dec 13, 1:48 PM ESTWinter Weather AdvisoryBOX7 hr
Dec 19, 4:23 AM ESTWinter Storm WatchBOX12 hr
Dec 19, 4:21 PM ESTWinter Weather AdvisoryBOX12 hr
Dec 25, 4:25 PM ESTFreezing Rain AdvisoryBOX3 hr
Dec 25, 7:09 PM ESTWinter Weather AdvisoryBOX27 hr
Dec 29, 4:04 AM ESTWind AdvisoryBOX21 hr
Dec 29, 9:29 AM ESTWind Chill AdvisoryBOX20 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 archive20082010

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.