Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 78, NWS Gray, ME

July 27, 2009Carroll County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 27, 2009, 3:15 PM EDT for Carroll County, New Hampshire. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 27, 2009, 3:15 PM EDT (19:15 UTC)
Expired
Jul 27, 2009, 4:00 PM EDT
In force
45 min
Issued by
NWS Gray, ME
Area
Storm-based polygon

County Carroll County, NH

The radar

The Portland,ME radar (KGYX), 76 km from the middle of the area, began a volume at 19:17 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.3 hours before the alert went out and 250 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.

Skew-T log-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2009-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 263 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2009-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
263 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 9:12 AM EDT, 6 hours 3 minutes earlier.

Area forecast discussion, Jul 27, 9:12 AM EDT, 6 hours 3 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
912 AM EDT MON JUL 27 2009

.SYNOPSIS...
A SOUTHWESTERLY SURFACE FLOW WILL CONTINUE THROUGH WEDNESDAY. A
WEAK COLD FRONT WILL TRACK EAST THRU THE AREA THIS AFTERNOON AND
PRODUCE ANOTHER ROUND OF THUNDERSTORMS. THE FRONT WILL ONLY ALLOW
HUMIDITY LEVELS TO DROP SLIGHTLY TONIGHT...BEFORE A BERMUDA HIGH
BEGINS PUSHING WARM AND HUMID AIR BACK INTO NORTHERN NEW ENGLAND
TUESDAY AND WEDNESDAY. A COLD FRONT APPROACHES FROM THE WEST EARLY
THURSDAY AND SLOWLY MOVES OFFSHORE EARLY FRIDAY. THE FRONT SLOWLY
CONTINUES SOUTH AND EAST OF THE REGION OVER THE WEEKEND.

&&

.NEAR TERM /UNTIL 8 PM THIS EVENING/...
A COLD FRONT WAS SITUATED OVER EASTERN NEW YORK STATE AT 12Z AND
WILL GRADUALLY SLIDE EASTWARD THIS AFTERNOON INTO NEW ENGLAND.
SOUTHERLY FLOW IN ADVANCE OF THE FRONT HAS 70 DEGREE DEWPOINTS
ALMOST ON OUR DOORSTEP WITH VALUES IN THE UPPER 60S AND LOWER 70S
EXPECTED ACROSS THE FORECAST AREA. SATELLITE SHOWED LOW CLOUDS AND
FOG BEGINNING TO BURN OFF WITH STRONG HEATING TO WARM TEMPERATURES
WITHIN A FEW DEGREES EITHER SIDE OF 80 BY MIDDAY...WITH ONLY THE
MID COAST A BIT COOLER GIVEN THE ONSHORE FLOW.
HEATING...SURFACE BOUNDARY...AND APPROACHING IMPULSE EVIDENT IN
WATER VAPOR IMAGERY WILL RESULT IN INCREASING CONVECTION BY EARLY
AFTERNOON. GIVEN EXPECTED STRONG STORMS HAVE ADDED ENHANCED
WORDING TO THE GRIDS AND PUBLIC PRODUCTS FOR THE MID MORNING
UPDATE.

PREV DISCUSSION...FORECAST UPDATE MAINLY TO REFLECT A DECREASE IN POPS BEHIND
CURRENT BATCH OF CONVECTION TRACKING OUT OF WRN ME ATTM. 500MB
THAT TRIGGERED THIS CONVECTION EASILY SEEN OVER SRN NEW ENGLAND ON
WV IMAGE...AND THIS SHOULD GIVE THE CWA A BRIEF DRY PERIOD THIS
MORNING. ALTHOUGH CANNOT RULE OUT A STRAY SHRA/TSRA DEVELOPING
ALONG ANY BOUNDARIES LEFT BEHIND BY OVERNIGHT OR EVEN YESTERDAYS
CONVECTION...BUT LEFT POPS MAINLY 20 OR LESS.

PREV DISCUSSION...WIDESPREAD FOG/STRATUS WILL DISSIPATE WITHING A
FE HOURS OF SUNRISE INLAND...BUT WILL TAKE LONGER ALONG THE
COAST...WHERE IT MAY HANG AROUND UNTIL EARLY AFTERNOON.

GFS SEEMS TO HAVE A DECENT HANDLE ON THE 500MB PATTERN...AT LEAST
WHEN CHECKED AGAINST WV IMAGERY...BUT PRECIP IS A BIT TOO
WIDESPREAD...MOST LIKELY DUE TO GRID SCALING. STILL MODELS IN FAIR
AGREEMENT THAT DECENT 500 MB SHORT WAVE TROUGH LIFTS NE ACROSS THE
CWA TODAY AND DRAGS A WEAK COLD FRONT THRU. THIS WILL BE THE FOCUS
SCT CONVECTION TODAY. VERTICAL WIND PROFILES LOOK FAVORABLE FOR
SOME BOWING SEGMENTS...AND SFC BASED INSTABILITY IN SOME AREAS
LOOKS QUITE HIGH...SO THERE IS SOME POTENTIAL FOR SEVERE
TODAY...ESPECIALLY IF NAM TIMING IS CORRECT AND FRONT CROSSES CWA
DURING THE WARMEST PART OF DAY...BUT GIVEN THE GFS CURRENT HANDLE
ON THINGS WILL LEAN TOWARD IT...WHICH WOULD PUT THE GREATEST
THREAT FOR SVR IN ERN ZONES THIS AFTERNOON. THINKING THAT WE WILL
SEE CLUSTERS OF STORMS. RATHER THAN A LINE...OUT AHEAD OF
FRONT...AND COVERAGE WILL NOT WARRANT POPS MUCH MORE THAN 50%.

&&

.SHORT TERM /8 PM THIS EVENING THROUGH 6 AM TUESDAY/...
MAY SEE SOME LINGERING CONVECTION IN THE EARLY EVE ALONG THE
COAST AS THE FRONT EXITS THIS AREA...BUT...SHOULD SEE SOME
CLEARING IN THE N...WITH TDS DROPPING OFF INTO THE UPPER 50S IN
THE MTNS TO LOW 60S NEAR THE COAST...AND SOME FOG LOOKS LIKELY
ONCE AGAIN...ESPECIALLY AFTER MIDNIGHT..AND WHERE SKIES CLEAR
OUT...BUT SHOULD NOT BE AS WIDESPREAD AS EARLY THIS MORNING.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
TEMPERATURES HEAT UP THROUGH MID WEEK TO SOME 5 TO 10 DEGREES ABOVE
NORMAL AWAY FROM THE COAST WHERE SOME DEGREE OF ONSHORE FLOW WILL
HELP TEMPER DAYTIME HIGHS TO THE NEAR NORMAL RANGE.  DEW POINTS IN
THE 60S INTO NEXT WEEKEND INDICATE STICKY CONDITIONS THROUGH THE PERIOD
ALSO. ALTHOUGH AMPLE MOISTURE AVAILABLE TUESDAY...LACK OF DYNAMICS SHOULD
KEEP ANY CONVECTION AT BAY. MORE IN THE WAY OF DYNAMICS WILL RE-INTRODUCE
THE THREAT OF CONVECTION THROUGH THE REST OF THE WORKWEEK AND AT
LEAST INTO THE EARLY WEEKEND. ALSO EXPECT SOME DEGREE OF OVERNIGHT
FOG THROUGH THE REST OF THE WEEK.

&&

.AVIATION /13Z MONDAY THROUGH FRIDAY/...
SHORT TERM...FOG AND STRATUS WILL DIMINISH FIRST INLAND THIS
MORNING...BUT COULD LINGER FOR A FEW HOURS AFTER SUNRISE AT
KPSM/KPWM/KAUG. HOWEVER...SHOULD SEE GRADUAL IMPROVEMENT DURING
THE MORNING HOURS. COULD SEE SOME LINGERING HZ AS WELL...BUT THIS
SHOULD DIMINISH ONCE ATMOSPHERE BECOMES WELL MIXED BY MIDDAY. SOME
SCT CONVECTION COULD FIND ITS WAY THRU ONE OF THE TERMINALS THIS
AFTERNOON...BUT FEEL CHANCES ARE NOT ENOUGH TO PUT IN TAFS ATTM.
VFR THIS EVE...BUT COULD SEE FOG DEVELOP AFTER MIDNIGHT.

LONG TERM...CONDITIONS BECOMING MOSTLY VFR TUESDAY AFTER SOME
EARLY MORNING IFR/LIFR IN AREAS OF FOG. THEREAFTER...AREAS OF
DAYTIME MVFR CONDITIONS IN ANY CONVECTIONS AND AREAS OF NIGHTTIME
IFR/LIFR CONDITIONS IN FOG.

&&

.MARINE...
SHORT TERM...WINDS HAVE DROPPED BLO SCA LVL...AND SHOULD REMAIN
THERE THRU TONIGHT...THOUGH COULD SEE A FEW GUSTS TO 20+ KTS THIS
AFTERNOON AHEAD OF SFC FRONT.  SEAS WILL RANGE FROM 2-4 FT.

LONG TERM...WINDS/SEAS BELOW SCA CRITERIA TUESDAY THROUGH FRIDAY.
DAYTIME VISIBILITY 1 TO 3 NM IN ANY SHOWERS/THUNDERSTORMS AND 1 NM
OR LESS IN NIGHTTIME AREAS OF FOG.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...NONE.

&&
Hazardous weather outlook, Jul 27, 2:49 PM EDT, 26 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE GRAY ME
249 PM EDT MON JUL 27 2009

MEZ018>028-NHZ001>010-013-014-281900-
INTERIOR YORK-INTERIOR CUMBERLAND-ANDROSCOGGIN-KENNEBEC-
INTERIOR WALDO-COASTAL YORK-COASTAL CUMBERLAND-SAGADAHOC-LINCOLN-
KNOX-COASTAL WALDO-NORTHERN COOS-SOUTHERN COOS-NORTHERN GRAFTON-
NORTHERN CARROLL-SOUTHERN GRAFTON-SOUTHERN CARROLL-SULLIVAN-
MERRIMACK-BELKNAP-STRAFFORD-INTERIOR ROCKINGHAM-COASTAL ROCKINGHAM-
249 PM EDT MON JUL 27 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE...CENTRAL NEW
HAMPSHIRE...NORTHERN NEW HAMPSHIRE AND SOUTHEASTERN NEW HAMPSHIRE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FEW THUNDERSTORMS MAY PRODUCE STRONG WINDS...HAIL AND LOCALLY HEAVY
RAIN THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

MEZ007>009-012>014-281900-
NORTHERN OXFORD-NORTHERN FRANKLIN-CENTRAL SOMERSET-SOUTHERN OXFORD-
SOUTHERN FRANKLIN-SOUTHERN SOMERSET-
249 PM EDT MON JUL 27 2009

...SEVERE THUNDERSTORM WATCH 628 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ANZ150>154-281900-
STONINGTON ME TO PORT CLYDE ME OUT TO 25 NM-PENOBSCOT BAY-
PORT CLYDE ME TO CAPE ELIZABETH ME OUT TO 25 NM-CASCO BAY-
CAPE ELIZABETH ME TO MERRIMACK RIVER MA OUT TO 25 NM-
249 PM EDT MON JUL 27 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CASCO BAY...PENOBSCOT
BAY...THE COASTAL WATERS FROM CAPE ELIZABETH ME TO MERRIMACK RIVER
MA...THE COASTAL WATERS FROM PORT CLYDE ME TO CAPE ELIZABETH ME AND
THE COASTAL WATERS FROM STONINGTON ME TO PORT CLYDE ME.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FEW THUNDERSTORMS MAY PRODUCE STRONG WINDS...HAIL AND LOCALLY HEAVY
RAIN THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Special weather statement, Jul 27, 2:43 PM EDT, 32 minutes before
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Special weather statement, Jul 27, 2:54 PM EDT, 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
254 PM EDT MON JUL 27 2009

NHZ008-271945-
MERRIMACK-
254 PM EDT MON JUL 27 2009

...STRONG THUNDERSTORMS WILL IMPACT MERRIMACK COUNTY THROUGH 345 PM
EDT...

AT 254 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED OVER BRADFORD...OR ABOUT 9 MILES
NORTHWEST OF HENNIKER...MOVING EAST AT 25 MPH. THIS STRONG
THUNDERSTORM WILL AFFECT AREAS IN AND AROUND SUTTON...BRADFORD...
WINSLOW STATE PARK...ROLLINS STATE PARK...WARNER...SALISBURY...
WEBSTER...AND WEST FRANKLIN THROUGH 345 PM EDT.

HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.

13
Local storm report, Jul 27, 3:06 PM EDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
306 PM EDT MON JUL 27 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0225 PM     TSTM WND DMG     1 SE ACWORTH            43.21N 72.28W
07/27/2009                   SULLIVAN           NH   PUBLIC

            PUBLIC REPORTS A TREE DOWN ON BALL ROAD IN SOUTH ACWORTH.
            ESTIMATED SIZE OF TREE AT 12 INCHES IN DIAMETER.

&&

DAG
Special weather statement, Jul 27, 3:09 PM EDT, 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
309 PM EDT MON JUL 27 2009

NHZ008-009-272015-
BELKNAP-MERRIMACK-
309 PM EDT MON JUL 27 2009

...STRONG THUNDERSTORMS WILL IMPACT BELKNAP COUNTY AND MERRIMACK
COUNTY THROUGH 415 PM EDT...

AT 310 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS CENTERED 3 MILES WEST OF WEBSTER...OR
ABOUT 10 MILES NORTH OF HENNIKER...MOVING NORTHEAST AT 30 MPH. THIS
CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND
WINSLOW STATE PARK...WADLEIGH STATE PARK...ROLLINS STATE PARK...MOUNT
SUNAPEE STATE PARK...WARNER...SUTTON...NEWBURY...BRADFORD...ANDOVER
AND WEBSTER THROUGH 415 PM EDT.

HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.
Special weather statement, Jul 27, 3:10 PM EDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
310 PM EDT MON JUL 27 2009

NHZ003>006-009-272000-
BELKNAP-NORTHERN CARROLL-NORTHERN GRAFTON-SOUTHERN CARROLL-SOUTHERN
GRAFTON-
310 PM EDT MON JUL 27 2009

...STRONG THUNDERSTORMS WILL IMPACT BELKNAP COUNTY...GRAFTON COUNTY
AND CARROLL COUNTY THROUGH 400 PM EDT...

AT 310 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS CENTERED 6 MILES SOUTHWEST OF
WATERVILLE VALLEY...OR ABOUT 10 MILES NORTHEAST OF PLYMOUTH...MOVING
NORTHEAST AT 25 MPH. THIS CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT
AREAS IN AND AROUND WOODSTOCK...THORNTON...HOLDERNESS...CENTER
HARBOR...WATERVILLE VALLEY...SANDWICH...MOULTONBOROUGH...NORTH
SANDWICH...LIVERMORE AND WHITE LAKE STATE PARK THROUGH 400 PM EDT.

HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.
Special weather statement, Jul 27, 3:11 PM EDT, 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
311 PM EDT MON JUL 27 2009

NHZ007-272015-
SULLIVAN-
311 PM EDT MON JUL 27 2009

...STRONG THUNDERSTORMS WILL IMPACT SULLIVAN COUNTY THROUGH 415 PM
EDT...

AT 312 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 7 MILES SOUTHWEST OF WASHINGTON...OR
ABOUT 12 MILES EAST OF BELLOWS FALLS...MOVING NORTHEAST AT 25 MPH.
THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND EAST
LEMPSTER...WASHINGTON AND PILLSBURY STATE PARK THROUGH 415 PM EDT.

HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 4:19 AM EDTSevere Thunderstorm WarningGYXSomerset41 min
Jul 27, 4:43 AM EDTSevere Thunderstorm WarningGYXSomerset32 min
Jul 27, 8:26 AM EDTSpecial Marine WarningGYX64 min
Jul 27, 2:38 PM EDTSevere Thunderstorm WarningGYXSomerset37 min
Jul 27, 3:07 PM EDTSevere Thunderstorm WarningGYXFranklin, Somerset38 min
Jul 27, 3:38 PM EDTSevere Thunderstorm WarningGYXOxford37 min
Jul 27, 3:52 PM EDTSevere Thunderstorm WarningGYXSomerset38 min
Jul 27, 3:59 PM EDTSevere Thunderstorm WarningGYXOxford33 min
Jul 27, 4:11 PM EDTSevere Thunderstorm WarningGYXAndroscoggin, Kennebec, Oxford34 min
Jul 27, 4:51 PM EDTSevere Thunderstorm WarningGYXAndroscoggin, Cumberland, Oxford39 min
Jul 27, 5:31 PM EDTAreal Flood AdvisoryGYXAndroscoggin, Kennebec3 hr
Jul 27, 6:03 PM EDTSevere Thunderstorm WarningGYXKennebec, Knox, Lincoln, Sagadahoc57 min
Jul 27, 12:57 PM EDTSevere Thunderstorm WarningGYXGrafton33 min
Jul 27, 2:15 PM EDTSevere Thunderstorm WarningGYXMerrimack, Sullivan45 min
Jul 27, 3:40 PM EDTSevere Thunderstorm WarningGYXBelknap, Merrimack35 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2009Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.