Alert archive / Maine / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 730
The Storm Prediction Center issued this severe thunderstorm watch at Aug 21, 2009, 5:41 PM EDT for 4 counties in Maine. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2009, 5:41 PM EDT (21:41 UTC)
- Expired
- Aug 21, 2009, 7:52 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Aroostook County, ME, Hancock County, ME, Penobscot County, ME, Piscataquis County, ME
The radar
The Caribou radar (KCBW), 84 km from the middle of the area, began a volume at 21:42 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 5:52 PM EDT | Severe Thunderstorm Warning | CAR | Aroostook, Piscataquis | 53 min |
| Aug 21, 6:09 PM EDT | Flash Flood Warning | CAR | Aroostook, Piscataquis, Somerset | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 10:47 AM EDT | Severe Thunderstorm Watch | SPC | Franklin, Oxford, Somerset | 7 hr |
| Aug 21, 4:22 PM EDT | Tornado Watch | SPC | Androscoggin, Cumberland, Franklin, Kennebec, Knox, Lincoln and 5 more | 3 hr |
| Aug 21, 5:55 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Aroostook, Cumberland, Franklin, Kennebec, Lincoln and 7 more | 80 min |
Nearby
Severe Thunderstorm Watches in Maine, 2009Every severe thunderstorm watch in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.