Alert archive / Massachusetts / Hampden County
Weather alerts in Hampden County, Massachusetts, 2009
153 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Hampden County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 153
- Warnings
- 37
- Watches
- 25
- Advisories
- 61
- Busiest month
- July48 alerts
- Busiest day
- August 21, 200913 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Hampden County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 20 | 14 | 30% | 14 | 100% | 21 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boston/Norton, MA: tornado warnings | 2 | 0 | 100% | 2 | 0% | |
| NWS Boston/Norton, MA: severe thunderstorm warnings | 114 | 66 | 42% | 250 | 78% | 21 min |
| NWS Boston/Norton, MA: flash flood warnings | 22 | 3 | 86% | 13 | 62% | 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 5, 3:33 PM EST | Winter Storm Watch | BOX | 24 hr |
| Jan 6, 4:53 AM EST | Winter Storm Warning | BOX | 47 hr |
| Jan 7, 12:10 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 6:08 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 9, 4:25 AM EST | Winter Storm Watch | BOX | 24 hr |
| Jan 10, 4:39 AM EST | Winter Storm Warning | BOX | 30 hr |
| Jan 10, 7:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 4:02 PM EST | Winter Weather Advisory | BOX | 29 hr |
| Jan 17, 4:22 PM EST | Winter Weather Advisory | BOX | 22 hr |
| Jan 26, 3:35 PM EST | Winter Storm Watch | BOX | 24 hr |
| Jan 27, 3:28 AM EST | Winter Storm Warning | BOX | 45 hr |
| Jan 28, 7:53 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 12:24 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 3, 4:40 AM EST | Winter Weather Advisory | BOX | 22 hr |
| Feb 4, 4:06 PM EST | Wind Chill Advisory | BOX | 16 hr |
| Feb 11, 3:48 PM EST | Wind Advisory | BOX | 36 hr |
| Feb 18, 4:21 AM EST | Winter Weather Advisory | BOX | 24 hr |
| Feb 18, 6:28 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 21, 4:35 AM EST | Winter Storm Watch | BOX | 12 hr |
| Feb 21, 4:26 PM EST | Winter Storm Warning | BOX | 31 hr |
| Feb 21, 4:26 PM EST | Winter Weather Advisory | BOX | 31 hr |
| Feb 28, 5:07 AM EST | Winter Storm Watch | BOX | 36 hr |
| Mar 1, 4:27 AM EST | Winter Storm Warning | BOX | 35 hr |
| Mar 1, 4:43 PM EST | Winter Weather Advisory | BOX | 26 hr |
| Mar 2, 12:41 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Apr 15, 11:56 AM EDT | Red Flag Warning | BOX | 6 hr |
| Apr 16, 4:50 PM EDT | Fire Weather Watch | BOX | 11 hr |
| Apr 17, 4:11 AM EDT | Red Flag Warning | BOX | 16 hr |
| Apr 27, 4:40 PM EDT | Fire Weather Watch | BOX | 12 hr |
| Apr 28, 4:26 AM EDT | Red Flag Warning | BOX | 17 hr |
| Apr 29, 4:36 PM EDT | Fire Weather Watch | BOX | 12 hr |
| Apr 30, 4:54 AM EDT | Red Flag Warning | BOX | 14 hr |
| May 9, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 9, 6:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 9, 7:07 PM EDT | Severe Thunderstorm Warning | BOX | 38 min |
| May 9, 7:45 PM EDT | Severe Thunderstorm Warning | BOX | 45 min |
| May 9, 8:16 PM EDT | Severe Thunderstorm Warning | BOX | 44 min |
| May 18, 4:18 AM EDT | Frost Advisory | BOX | 27 hr |
| May 18, 4:18 AM EDT | Freeze Warning | BOX | 27 hr |
| May 20, 4:12 PM EDT | Fire Weather Watch | BOX | 12 hr |
| May 21, 3:47 AM EDT | Red Flag Warning | BOX | 16 hr |
| May 24, 11:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 4:07 PM EDT | Severe Thunderstorm Warning | BOX | 18 min |
| May 24, 5:46 PM EDT | Severe Thunderstorm Warning | BOX | 19 min |
| May 31, 4:16 AM EDT | Frost Advisory | BOX | 27 hr |
| Jun 12, 2:43 AM EDT | Areal Flood Advisory | BOX | 107 min |
| Jun 12, 4:44 AM EDT | Areal Flood Advisory | BOX | 106 min |
| Jun 13, 8:41 PM EDT | Areal Flood Advisory | BOX | 85 min |
| Jun 13, 11:48 PM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jun 15, 1:24 AM EDT | Areal Flood Advisory | BOX | 96 min |
| Jun 19, 4:35 PM EDT | Flood Watch | BOX | 36 hr |
| Jun 27, 5:41 AM EDT | Dense Fog Advisory | BOX | 2 hr |
| Jun 27, 4:40 PM EDT | Areal Flood Advisory | BOX | 100 min |
| Jun 27, 7:38 PM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jun 30, 8:42 PM EDT | Severe Thunderstorm Warning | BOX | 33 min |
| Jun 30, 8:51 PM EDT | Areal Flood Advisory | BOX | 78 min |
| Jun 30, 9:19 PM EDT | Severe Thunderstorm Warning | BOX | 26 min |
| Jul 1, 4:54 AM EDT | Flash Flood Watch | BOX | 42 hr |
| Jul 1, 12:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 2, 5:17 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 2, 3:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 2, 4:56 PM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 3, 4:08 AM EDT | Flash Flood Watch | BOX | 16 hr |
| Jul 3, 5:59 PM EDT | Severe Thunderstorm Warning | BOX | 31 min |
| Jul 7, 8:59 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 7, 11:05 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 7, 1:12 PM EDT | Severe Thunderstorm Warning | BOX | 37 min |
| Jul 7, 1:30 PM EDT | Areal Flood Advisory | BOX | 93 min |
| Jul 7, 2:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 7, 2:41 PM EDT | Severe Thunderstorm Warning | BOX | 64 min |
| Jul 7, 4:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 7:12 PM EDT | Severe Thunderstorm Warning | BOX | 48 min |
| Jul 7, 7:58 PM EDT | Areal Flood Advisory | BOX | 92 min |
| Jul 16, 6:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 16, 7:25 PM EDT | Severe Thunderstorm Warning | BOX | 35 min |
| Jul 16, 7:42 PM EDT | Mesoscale Discussion | SPC | 33 min |
| Jul 18, 12:34 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 21, 9:28 AM EDT | Areal Flood Advisory | BOX | 6 hr |
| Jul 23, 2:54 PM EDT | Flood Watch | BOX | 19 hr |
| Jul 24, 1:10 AM EDT | Areal Flood Advisory | BOX | 4 hr |
| Jul 24, 4:58 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 26, 4:38 AM EDT | Flash Flood Watch | BOX | 24 hr |
| Jul 26, 1:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 26, 6:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 26, 7:49 PM EDT | Severe Thunderstorm Warning | BOX | 41 min |
| Jul 26, 8:07 PM EDT | Severe Thunderstorm Warning | BOX | 38 min |
| Jul 27, 2:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 27, 9:20 PM EDT | Areal Flood Advisory | BOX | 100 min |
| Jul 29, 4:10 AM EDT | Flash Flood Watch | BOX | 24 hr |
| Jul 29, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 29, 2:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jul 29, 5:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 29, 8:23 PM EDT | Areal Flood Advisory | BOX | 4 hr |
| Jul 30, 12:50 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 30, 3:57 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 31, 10:24 AM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 31, 12:47 PM EDT | Flash Flood Watch | BOX | 5 hr |
| Jul 31, 1:23 PM EDT | Areal Flood Advisory | BOX | 3 hr |
| Jul 31, 2:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 31, 2:47 PM EDT | Areal Flood Advisory | BOX | 3 hr |
| Aug 5, 1:50 PM EDT | Severe Thunderstorm Warning | BOX | 55 min |
| Aug 5, 2:14 PM EDT | Areal Flood Advisory | BOX | 75 min |
| Aug 5, 2:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 5, 2:44 PM EDT | Flash Flood Warning | BOX | 35 min |
| Aug 10, 4:13 AM EDT | Heat Advisory | BOX | 11 hr |
| Aug 21, 10:01 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 21, 10:47 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 1:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 21, 4:04 PM EDT | Severe Thunderstorm Warning | BOX | 41 min |
| Aug 21, 4:22 PM EDT | Tornado Watch | SPC | 3 hr |
| Aug 21, 4:34 PM EDT | Areal Flood Advisory | BOX | 116 min |
| Aug 21, 4:36 PM EDT | Severe Thunderstorm Warning | BOX | 54 min |
| Aug 21, 4:57 PM EDT | Areal Flood Advisory | BOX | 2 hr |
| Aug 21, 5:16 PM EDT | Severe Thunderstorm Warning | BOX | 59 min |
| Aug 21, 5:38 PM EDT | Severe Thunderstorm Warning | BOX | 67 min |
| Aug 21, 5:55 PM EDT | Mesoscale Discussion | SPC | 80 min |
| Aug 21, 6:02 PM EDT | Areal Flood Advisory | BOX | 118 min |
| Aug 21, 6:05 PM EDT | Severe Thunderstorm Warning | BOX | 55 min |
| Aug 22, 3:38 PM EDT | Areal Flood Advisory | BOX | 112 min |
| Aug 23, 6:44 PM EDT | Areal Flood Advisory | BOX | 2 hr |
| Aug 23, 7:08 PM EDT | Areal Flood Advisory | BOX | 52 min |
| Aug 23, 7:46 PM EDT | Areal Flood Advisory | BOX | 119 min |
| Aug 23, 8:17 PM EDT | Flash Flood Warning | BOX | 65 min |
| Aug 28, 4:29 PM EDT | Flood Watch | BOX | 26 hr |
| Sep 19, 2:49 AM EDT | Frost Advisory | BOX | 29 hr |
| Sep 25, 4:38 AM EDT | Frost Advisory | BOX | 27 hr |
| Oct 3, 10:52 PM EDT | Areal Flood Advisory | BOX | 113 min |
| Oct 6, 3:28 PM EDT | Wind Advisory | BOX | 36 hr |
| Oct 10, 3:08 AM EDT | Frost Advisory | BOX | 29 hr |
| Oct 11, 3:05 AM EDT | Frost Advisory | BOX | 29 hr |
| Oct 11, 3:05 AM EDT | Freeze Warning | BOX | 29 hr |
| Oct 18, 4:42 AM EDT | Winter Weather Advisory | BOX | 19 hr |
| Nov 27, 4:10 AM EST | Wind Advisory | BOX | 34 hr |
| Nov 28, 8:40 AM EST | High Wind Warning | BOX | 6 hr |
| Dec 2, 4:25 PM EST | Wind Advisory | BOX | 18 hr |
| Dec 3, 5:38 AM EST | Areal Flood Advisory | BOX | 112 min |
| Dec 3, 6:28 AM EST | Mesoscale Discussion | SPC | 62 min |
| Dec 5, 4:36 AM EST | Winter Weather Advisory | BOX | 22 hr |
| Dec 8, 3:59 PM EST | Winter Storm Warning | BOX | 21 hr |
| Dec 8, 3:59 PM EST | Winter Weather Advisory | BOX | 19 hr |
| Dec 13, 1:48 PM EST | Winter Weather Advisory | BOX | 7 hr |
| Dec 18, 3:20 PM EST | Winter Storm Watch | BOX | 13 hr |
| Dec 19, 4:23 AM EST | Winter Storm Watch | BOX | 12 hr |
| Dec 19, 4:23 AM EST | Winter Storm Warning | BOX | 32 hr |
| Dec 19, 7:25 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 20, 12:32 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 20, 4:02 AM EST | Winter Weather Advisory | BOX | 8 hr |
| Dec 25, 4:25 PM EST | Freezing Rain Advisory | BOX | 3 hr |
| Dec 25, 7:09 PM EST | Winter Weather Advisory | BOX | 27 hr |
| Dec 29, 4:04 AM EST | Wind Advisory | BOX | 21 hr |
| Dec 29, 9:29 AM EST | Wind Chill Advisory | BOX | 20 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 20 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 30 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Flood Watch | 3 |
| Areal Flood Advisory | 33 |
| Winter | |
| Winter Storm Warning | 7 |
| Winter Storm Watch | 7 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 12 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 6 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 5 |
| Fire Weather Watch | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
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.