Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 232, NWS Gray, ME

September 27, 2007Strafford County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Sep 27, 2007, 9:26 AM EDT for Strafford County, New Hampshire. It was in force for 34 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
Sep 27, 2007, 9:26 AM EDT (13:26 UTC)
Expired
Sep 27, 2007, 10:00 AM EDT
In force
34 min
Issued by
NWS Gray, ME
Area
Counties, with a storm outline in the text

County Strafford County, NH

The radar

The Portland,ME radar (KGYX), 91 km from the middle of the area, began a volume at 13:29 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, 1.4 hours before the alert went out and 238 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 2007-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 924 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 2007-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 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
924 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
814 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

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 Sep 27, 2:39 AM EDT, 6 hours 47 minutes earlier.

Area forecast discussion, Sep 27, 2:39 AM EDT, 6 hours 47 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
239 AM EDT THU SEP 27 2007

.SYNOPSIS...
A WEAK FRONT HAS STALLED OVER CENTRAL SECTIONS OF THE FORECAST
AREA. SEVERAL WEAK WAVES OF LOW PRESSURE WILL MOVE ALONG THE FRONT
TODAY INTO FRIDAY. BY LATE FRIDAY A COLD FRONT WILL SWEEP ACROSS
THE AREA. HIGH PRESSURE WILL BUILD ACROSS THE AREA ON
SATURDAY...THEN CREST OVER THE REGION ON SUNDAY. A RETURN
SOUTHWESTERLY FLOW WILL DEVELOP ON THE BACK SIDE OF THE HIGH LATE
MONDAY INTO WEDNESDAY.

&&

.NEAR TERM /THROUGH TODAY/...
A TROPICAL LIGHT SLY FLOW WILL CONTINUE OVER THE AREA TODAY AS A
STALLED WEAK FRONT GRADUALLY BECOMES WASHED OUT. SEVERAL WEAK WAVES
OF LOW PRES WILL MOVE ALONG THE WASHED OUT FRONT PRODUCING BANDS OF
SHOWERS AND SCATTERED TSTMS AT TIMES. TEMPS WILL BE NOT AS WARM AS
YESTERDAY DUE TO THE CLOUDS AND SHWRS BUT DEWPOINTS WILL REMAIN
HIGH ALLOWING HUMIDITIES TO REMAIN HIGH. WINDS WILL REMAIN LIGHT.
POPS WILL BE HIGH.

&&

.SHORT TERM /TONIGHT/...
A CONTINUED TROPICAL REGIME IS EXPECTED TONIGHT ON THE LIGHT
SOUTHERLY FLOW. THE AIR MASS WILL REMAIN UNSTABLE AS THE LONG WAVE
TROF APPROACHES FROM THE WEST. VERY HIGH POPS MAKES SENSE WITH
SHOWERS AND SCATTERED TSTMS CONTINUING. AREAS OF FOG WILL ALSO
DEVELOP DUE TO THE LIGHT FLOW AND CONDITIONS CLOSE TO SATURATION
IN THE LOW LEVELS. TEMPS WILL ONCE AGAIN BE MILD AND IT WILL FEEL
MORE LIKE A SUMMER EVENING DUE TO THE HIGH HUMIDITIES.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
PRECIPITATION WILL BECOME MORE STRATIFORM AS LOW PRESSURE MOVES
NORTHEAST THROUGH THE REGION...AND TAPER OFF AS THE LOW HEADS TO
THE GULF OF SAINT LAWRENCE LATE FRIDAY. EXPECT ABOUT THREE
QUARTERS OF AN INCH OF RAIN IN THE HILLS AND CLOSER TO A QUARTER
NEAR THE COAST. A FEW SHOWERS WILL LINGER IN THE MOUNTAINS THROUGH
EARLY SATURDAY AS COLD AIR STARTS ADVECTING ON BRISK NORTHWESTERLY WINDS.

REMAINING FAIRLY COOL THROUGH THE WEEKEND WITH HIGHS IN THE
60S...BUT LOWS DIPPING TO THE 30S TO LOWER 40S SATURDAY NIGHT.
THINGS START WARMING UP AGAIN FOR THE BEGINNING OF NEXT WEEK AS
THE HIGH MOVES OFFSHORE. LITTLE CHANGE THROUGH WEDNESDAY EXCEPT
FOR A WEAK SHORT WAVE THAT COULD TRIGGER A FEW SHOWERS IN
NORTHERN AREAS TUESDAY NIGHT.
&&

.AVIATION /06Z THURSDAY THROUGH MONDAY/...
SHORT TERM...VFR CONDITIONS WILL GRADUALLY DETERIORATE TO MVFR AND
IFR CONDITIONS TODAY AS SHOWERS AND TSTMS DEVELOP. IN THE MORNING
SOME AREAS OF FOG IN SOME LOW LYING AREAS WILL CREATE LIFR CONDS
INTO THE MID MORNING HOURS. BY LATER TODAY AND TONIGHT ALL AREAS
SHOULD BE MVFR TO IFR IN SHOWERS AND AREAS OF FOG WITH EVEN A FEW
TSTMS PSBL.

LONG TERM...CONTINUED MVFR TO IFR IN RAIN AND FOG FRIDAY BUT
IMPROVING TO VFR BY THE END OF THE DAY. BRISK NORTHWESTERLY
BREEZES DEVELOPING FRIDAY NIGHT AND SATURDAY.

&&

.MARINE...
SHORT TERM...A LIGHT SOUTHERLY TROPICAL FLOW WILL CONTINUE TODAY
AND TONIGHT. SEAS TO REMAIN IN THE 2-4 FT RANGE. CONDITIONS WILL
REMAIN BELOW SCA CRITERIA. TROPICAL SHOWERS AND AREAS OF FOG WILL
REDUCE VSBYS AT TIMES...ESPECIALLY TONIGHT.

LONG TERM...CONDITIONS COULD APPROACH SCA CRITERIA IN COLD AIR
ADVECTION FRIDAY NIGHT INTO SATURDAY.

&&

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

&&
Hazardous weather outlook, Sep 27, 6:12 AM EDT, 3 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAY ME
612 AM EDT THU SEP 27 2007

ANZ150-MEZ007>009-012>014-018>028-NHZ001>010-013-014-281015-
STONINGTON ME TO MERRIMACK RIVER MA OUT TO 25 NM-NORTHERN OXFORD-
NORTHERN FRANKLIN-CENTRAL SOMERSET-SOUTHERN OXFORD-SOUTHERN FRANKLIN-
SOUTHERN SOMERSET-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-
612 AM EDT THU SEP 27 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE...CENTRAL NEW
HAMPSHIRE...NORTHERN NEW HAMPSHIRE...SOUTHEASTERN NEW HAMPSHIRE AND
THE COASTAL WATERS FROM STONINGTON ME TO THE MERRIMACK RIVER MA.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. WEAK IMPULSES WILL
MOVE ALONG A STALLED FRONT ACROSS CENTRAL MAINE AND BRING AREAS OF
SHOWERS AND A FEW THUNDERSTORMS. A STRONGER LOW WILL BRING A MORE
WIDESPREAD STEADY RAIN TONIGHT INTO FRIDAY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Sep 27, 7:28 AM EDT, 1 hour 58 minutes before
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Special weather statement, Sep 27, 8:34 AM EDT, 52 minutes before
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Local storm report, Sep 27, 8:42 AM EDT, 44 minutes before
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Local storm report, Sep 27, 8:54 AM EDT, 32 minutes before
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Special weather statement, Sep 27, 9:13 AM EDT, 13 minutes before
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Special weather statement, Sep 27, 9:15 AM EDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 27, 8:15 AM EDTSevere Thunderstorm WarningGYXYork45 min
Sep 27, 8:46 AM EDTSpecial Marine WarningGYX59 min
Sep 27, 10:18 AM EDTSevere Thunderstorm WarningGYXYork42 min
Sep 27, 10:48 AM EDTSpecial Marine WarningGYX57 min
Sep 27, 3:29 PM EDTSevere Thunderstorm WarningGYXOxford31 min
Sep 27, 5:02 PM EDTSevere Thunderstorm WarningGYXOxford28 min
Sep 27, 5:32 PM EDTSevere Thunderstorm WarningGYXFranklin43 min
Sep 27, 6:20 PM EDTSevere Thunderstorm WarningGYXFranklin, Somerset40 min
Sep 27, 2:50 PM EDTSevere Thunderstorm WarningGYXSullivan40 min
Sep 27, 2:52 PM EDTSevere Thunderstorm WarningGYXCoos38 min
Sep 27, 3:25 PM EDTSevere Thunderstorm WarningGYXMerrimack, Sullivan35 min
Sep 27, 3:41 PM EDTSevere Thunderstorm WarningGYXBelknap, Grafton34 min
Sep 27, 4:01 PM EDTSevere Thunderstorm WarningGYXSullivan44 min
Sep 27, 4:15 PM EDTSevere Thunderstorm WarningGYXBelknap, Grafton45 min
Sep 27, 4:18 PM EDTSevere Thunderstorm WarningGYXCoos42 min
Sep 27, 4:43 PM EDTSevere Thunderstorm WarningGYXCarroll47 min
Sep 27, 4:57 PM EDTSevere Thunderstorm WarningGYXSullivan48 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2007Every severe thunderstorm warning in 2007

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.