Alert archive / Maine / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 607
The Storm Prediction Center issued this severe thunderstorm watch at Jul 6, 2011, 5:35 PM EDT for Penobscot County, Piscataquis County, Maine. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2011, 5:35 PM EDT (21:35 UTC)
- Expired
- Jul 6, 2011, 8:38 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Penobscot County, ME, Piscataquis County, ME
The radar
The Caribou radar (KCBW), 105 km from the middle of the area, began a volume at 21:37 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
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 5:49 PM EDT | Severe Thunderstorm Warning | CAR | Piscataquis, Somerset | 56 min |
| Jul 6, 6:32 PM EDT | Severe Thunderstorm Warning | CAR | Penobscot, Piscataquis | 58 min |
| Jul 6, 6:42 PM EDT | Severe Thunderstorm Warning | CAR | Penobscot, Piscataquis | 63 min |
| Jul 6, 7:06 PM EDT | Severe Thunderstorm Warning | CAR | Aroostook, Penobscot, Piscataquis | 54 min |
| Jul 6, 7:12 PM EDT | Severe Thunderstorm Warning | CAR | Aroostook, Hancock, Penobscot, Washington | 63 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Caribou, ME (KCAR), launched 12:00Z, 9.6 hours before the alert went out and 165 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 51 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 1368 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
861
WWUS20 KWNS 062135
SEL7
SPC WW 062135
MEZ000-070200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 607
NWS STORM PREDICTION CENTER NORMAN OK
535 PM EDT WED JUL 6 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND EASTERN MAINE
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 535 PM UNTIL
1000 PM EDT.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH OF
BANGOR MAINE TO 10 MILES SOUTHEAST OF BANGOR MAINE. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 605...WW 606...
DISCUSSION...ORGANIZED COMPLEX OF TSTMS PRECEDING SHORT WAVE TROUGH
WILL CONTINUE EWD THIS EVENING AMIDST A MODERATELY UNSTABLE AIR MASS
WITH MLCAPE OF 1000-1500 J/KG. GIVEN THE 40-45 KT EWD MOTION OF
ONGOING STORMS...THE POTENTIAL FOR DAMAGING WINDS WILL EXIST AS
ACTIVITY PROGRESSES EWD ACROSS THE WATCH AREA.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.
...MEADSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 1:04 PM EDT | Mesoscale Discussion | SPC | Oxford | 56 min |
| Jul 6, 1:29 PM EDT | Severe Thunderstorm Watch | SPC | Franklin, Oxford, Somerset | 8 hr |
| Jul 6, 6:03 PM EDT | Mesoscale Discussion | SPC | Franklin, Oxford, Penobscot, Piscataquis, Somerset | 87 min |
Nearby
Severe Thunderstorm Watches in Maine, 2011Every severe thunderstorm watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.