Alert archive / Maine / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 129, NWS Gray, ME

July 15, 2007York County, Maine

NWS Gray, ME issued this severe thunderstorm warning at Jul 15, 2007, 1:32 PM EDT for York County, Maine. It was in force for 58 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 15, 2007, 1:32 PM EDT (17:32 UTC)
Expired
Jul 15, 2007, 2:30 PM EDT
In force
58 min
Issued by
NWS Gray, ME
Area
Counties, with a storm outline in the text

County York County, ME

The radar

The Portland,ME radar (KGYX), 61 km from the middle of the area, began a volume at 17:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 15, 12:01 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 5.5 hours before the alert went out and 61 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, Gray, ME at 12:00Z on 2007-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Gray, ME at 12:00Z on 2007-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1159 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 15, 10:13 AM EDT, 3 hours 19 minutes earlier.

Area forecast discussion, Jul 15, 10:13 AM EDT, 3 hours 19 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
1013 AM EDT SUN JUL 15 2007

.SYNOPSIS...
COLD FRONT WILL CROSS THE REGION THIS AFTERNOON/EVENING...
FOLLOWED BY A WEAK AREA OF HIGH PRESSURE LATER TONIGHT AND
MONDAY. ANOTHER BOUNDARY WILL TRANSIT THE REGION MONDAY NIGHT...
THOUGH MODELS NOT IN AGREEMENT ABOUT POSITION/TIMING. PATTERN OF
WEAK DISTURBANCES MOVING THROUGH REGION IN FAST FLOW CONTINUES
INTO THE WEEKEND. THERE ALSO CONTINUES TO BE MUCH UNCERTAINTY IN
THE TIMING AND LOCATION OF THESE SYSTEMS.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
THE FORECAST PROBLEM FOR TODAY WILL BE THUNDERSTORMS.

THE LOW CLOUDS AND FOG IS LIFTING...ALLOWING CLEARING TO OCCUR
ACROSS SOUTHEAST NEW HAMPSHIRE AND SOUTHWEST MAINE. AN INITIAL
LINE OF CONVECTIVE LOOKING RAIN IS CROSSING NORTHERN AND CENTRAL
NEW HAMPSHIRE...WITH DEEPER CLOUDS ACROSS THE MOUNTAINS.

IT APPEARS AS THOUGH THE MOUNTAINS WILL STAY IN THE FRONTAL CLOUD
BAND AREA TODAY...AND THE CONVECTIVE POTENTIAL HERE IS SOMEWHAT
LIMITED. FURTHER SOUTH...AFTER THE PASSAGE OF THE INITIAL RAIN
BAND...THE AIRMASS WILL GET A CHANCE TO DESTABILIZE AGAIN. THIS
SHOULD ALLOW A MODERATE UNSTABLE AIRMASS TO MATERIALIZE...WITH A
GOOD SHEAR PROFILE. THIS AREA SHOULD EVENTUALLY COVER THE FOOTHILLS
AND INTERIOR PORTIONS OF WESTERN MAINE AND INTERIOR NEW HAMPSHIRE
THIS AFTERNOON.

MODEL SOUNDINGS SHOW LITTLE IN THE WAY OF CAPPING AND A GOOD WIND
PROFILE WITH TURNING IN THE LOWER LEVELS. THE INSTABILITY MAY
NOT BE PRESENT FOR SUPER CELL DEVELOPMENT...BUT MULTIPLE STRUCTURE
IS LIKELY WITH LINE SEGMENTS AND BOW STRUCTURES CAPABLE OF PRODUCING
WIND DAMAGE. THE WORDING FOR THESE AREAS HAS BEEN ENHANCED TO
INCLUDE DAMAGING WINDS.

CLOSER TO THE COAST...THE AIRMASS LOOKS CAPPED IN THE LOWER LEVELS
(AS SEEN ON THE GYX 12Z SOUNDING). IT APPEARS TO BE DUE PRIMARILY
TO THE MARINE LAYER IN PLACE THIS MORNING. THIS COULD LIMIT THE
CONVECTIVE POTENTIAL TO SOME DEGREE...AND MODEL SOUNDINGS SHOW
THIS FEATURE PERSISTING INTO THE AFTERNOON. WILL CONTINUE WITH THE
PREVIOUS ENHANCED WORDING IN THESE AREAS.

THE CONVECTION SHOULD BE LIMITED THIS MORNING...INCREASING THIS
AFTERNOON WITH INCREASED INSTABILITY. A SURFACE TROUGH ACROSS
EAST CENTRAL NEW YORK WILL SERVE AS A FOCUS FOR THE CONVECTION...
WITH THE PRIME THUNDERSTORM ACTIVITY EXPECTED BETWEEN 17Z AND 22Z
THUS AFTERNOON. WIND DAMAGE IS THE MAIN THREAT...WITH LARGE HAIL
PROBABLY BEING LIMITED TO SUPER CELLS OR MINI SUPER CELLS...AS THE
WET BULB ZERO VALUES ARE HIGH.

CLEANED UP THE SKY COVER FOR THIS AFTERNOON...BUT THE REMAINDER OF
THE NEAR TERM REMAINS INTACT.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM MONDAY/...
FRONT MOVES OFFSHORE THIS EVENING FOLLOWED BY CLEARING TREND
OVERNIGHT AS WEAK HIGH PRESSURE WORKS ITS WAY ACROSS FORECAST
AREA. HAVE ONCE AGAIN USED BLEND OF CURRENT FORECAST/ MAV/MET DATA
FOR TEMPERATURES AND BLEND OF CURRENT FORECAST/MAV DATA FOR POPS.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
EASTERN TROUGH REMAINS IN TACT THROUGH THE LONG RANGE PERIOD. WEAK
IMPULSES WILL CONTINUE TO CIRCULATE AROUND THIS TROUGH THROUGHOUT
THE UPCOMING WEEK.

A VERY WEAK FRONT PASSES THROUGH THE REGION FROM MONDAY AFTERNOON
THROUGH MONDAY NIGHT. MODELS HAVE BEEN GETTING FASTER WITH THIS
FRONT AND BECOMING WEAKER SO NOT EXPECTING MUCH IN THE WAY OF
PRECIPITATION WITH THE FRONT. GFS SHOWING WEAK
DISTURBANCE...RATHER SHEARED OUT...MOVING EAST ALONG FRONTAL
BOUNDARY OVERNIGHT MONDAY NIGHT. GENERALLY EXPECTING ONLY WIDELY
SCATTERED SHOWERS/ISOLATED TSTMS WITH FRONT WITH GREATEST THREAT
DURING OVERNIGHT PERIOD IN SOUTHERN AREAS AS DISTURBANCE PASSES
EAST.

NAM QUITE DIFFERENT FROM OTHER MODELS...SO HAVE DISCOUNTED
SIGNIFICANT PRECIP EVENT THAT IT IS ADVERTISING FOR TUESDAY.
PREFER GFS SOLUTION WHICH BRINGS RIDGE ACROSS AREA DURING DAY.

MODELS CONTINUE TO SHOW A SERIES OF DISTURBANCES MOVING AROUND THE
UPPER TROUGH. TIMING AND IMPACT OF THESE DISTURBANCES IS UNCERTAIN
AT THIS TIME.

&&

.AVIATION /14Z SUNDAY THROUGH THURSDAY/...
THE LAST OF THE MORNING STRATUS AND FOG IS LIFTING...AND SHOULD BE
GONE BY 15Z. AFTER THIS...VFR CONDITIONS ARE EXPECTED TO PREVAIL.
SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED IN THE TERMINAL
LOCATIONS...AND ARE BEING ADDED TO THE FORECAST AS NEEDED THIS
MORNING. DEPENDING ON THE STRENGTH OF THE CONVECTION...MAY NEED TO
ADD WIND INFORMATION WITH THUNDERSTORMS THIS AFTERNOON.

BECOMING MOSTLY VFR TONIGHT THOUGH SOME MVFR IN PATCHY FOG EXPECTED.
VFR CONDITIONS EXPECTED MONDAY...ALTHOUGH SOME MVFR CONDITIONS POSSIBLE
IN WIDELY SCATTERED SHOWERS/ISOLATED THUNDERSTORMS MOVING
SOUTHEAST FROM MOUNTAINS TO COAST FROM MONDAY AFTERNOON THROUGH
TUESDAY MORNING. WEAK DISTURBANCES WILL IMPACT REGION PERIODICALLY
THROUGH THURSDAY...HOWEVER STRENGTH AND TIMING OF THESE
DISTURBANCES IS UNCERTAIN AT THIS TIME.

&

.MARINE...
SHORT TERM...WINDS ARE ALREADY STARTING TO INCREASE WITH THE
GRADIENT AND PASSAGE OF THE SURFACE WARM FRONT. THE DEPTH OF THE
MIXED LAYER IS STILL VERY LOW...AND THE STRONGEST WINDS WILL BE
OBSERVED AT THE C MAN STATIONS. WILL CONTINUE TO ADVERTISE NEAR
SMALL CRAFT LEVEL WINDS FOR THIS AFTERNOON...UNTIL THE PASSAGE OF
THE SURFACE TROUGH.

SEAS SHOULD RESPOND FURTHER TO THE INCREASED FETCH...ATTAINING
SMALL CRAFT LEVELS THIS AFTERNOON. THE SWELL SHOULD DROP BACK
BELOW SMALL CRAFT LIMITS LATER TONIGHT OR MONDAY MORNING.

LONG TERM...SEAS WILL GRADUALLY SUBSIDE MONDAY AS HIGH PRESSURE
BUILDS ACROSS AREA. A SERIES OF WEAK DISTURBANCES WILL IMPACT
REGION PERIODICALLY THROUGH THURSDAY...HOWEVER STRENGTH AND TIMING
OF THESE DISTURBANCES IS UNCERTAIN AT THIS TIME.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 AM EDT MONDAY FOR ANZ150.

&&

NEAR TERM...HAYES
AVIATION...HAYES
MARINE...HAYES
Hazardous weather outlook, Jul 15, 6:01 AM EDT, 7 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAY ME
601 AM EDT SUN JUL 15 2007

ANZ150-170-MEZ007>009-012>014-018>028-NHZ001>010-013-014-161015-
STONINGTON ME TO MERRIMACK RIVER MA OUT TO 25 NM-
WATERS FROM STONINGTON (DEER ISLE) ME TO MERRIMACK RIVER MA FROM
25 TO 40 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-
601 AM EDT SUN JUL 15 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

THERE IS A SLIGHT RISK OF STRONG TO SEVERE THUNDERSTORMS THIS
AFTERNOON AS A FRONTAL BOUNDARY MOVES THROUGH THE REGION. THE
GREATEST THREAT WILL BE DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Special weather statement, Jul 15, 10:38 AM EDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
1038 AM EDT SUN JUL 15 2007

MEZ012-018-019-NHZ006-009-151545-
BELKNAP-INTERIOR CUMBERLAND-INTERIOR YORK-SOUTHERN CARROLL-SOUTHERN
OXFORD-
1038 AM EDT SUN JUL 15 2007

...STRONG THUNDERSTORMS WILL IMPACT BELKNAP COUNTY...OXFORD COUNTY...
YORK COUNTY...CUMBERLAND COUNTY AND CARROLL COUNTY THROUGH 1145 AM
EDT...

AT 1038 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES SOUTHEAST OF NEW  HAMPTON...
MOVING EAST AT 40 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN
AND AROUND SANBORNTON...NEW HAMPTON...LACONIA...MEREDITH...
GILFORD...WOLFEBORO...BRIDGEWATER...TUFTONBORO...CENTER HARBOR AND
OSSIPEE THROUGH 1145 AM EDT.

SMALL HAIL...HEAVY DOWNPOURS...CLOUD-TO-GROUND LIGHTNING AND GUSTY
WINDS OF 35 TO 45 MPH CAN BE EXPECTED.

HAYES
Special weather statement, Jul 15, 11:15 AM EDT, 2 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
1115 AM EDT SUN JUL 15 2007

NHZ008>010-151615-
BELKNAP-MERRIMACK-STRAFFORD-
1115 AM EDT SUN JUL 15 2007

...STRONG THUNDERSTORMS WILL IMPACT BELKNAP COUNTY...STRAFFORD COUNTY
AND MERRIMACK COUNTY THROUGH 1215 PM EDT...

AT 1115 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 11 MILES SOUTHWEST OF HENNIKER...MOVING
NORTHEAST AT 35 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN
AND AROUND HENNIKER...CONTOOCOOK...HOPKINTON...CONCORD...BOSCAWEN...
CANTERBURY...LOUDON...CHICHESTER...GILMANTON AND EPSOM THROUGH 1215
PM EDT.

SMALL HAIL...HEAVY DOWNPOURS...CLOUD-TO-GROUND LIGHTNING AND GUSTY
WINDS OF 35 TO 45 MPH CAN BE EXPECTED.

HAYES
Special weather statement, Jul 15, 11:44 AM EDT, 1 hour 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
1144 AM EDT SUN JUL 15 2007

MEZ018-NHZ006-008>010-151645-
BELKNAP-INTERIOR YORK-MERRIMACK-SOUTHERN CARROLL-STRAFFORD-
1144 AM EDT SUN JUL 15 2007

...STRONG THUNDERSTORMS WILL IMPACT BELKNAP COUNTY...STRAFFORD
COUNTY...MERRIMACK COUNTY...YORK COUNTY AND CARROLL COUNTY THROUGH
1245 PM EDT...

AT 1144 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED ABOUT 7 MILES WEST OF CONCORD...MOVING
NORTHEAST AT 40 MPH. THIS STRONG THUNDERSTORM WILL AFFECT
HOPKINTON...CONTOOCOOK...CONCORD...BOSCAWEN...CANTERBURY...LOUDON...
EPSOM...CHICHESTER...PITTSFIELD AND BARNSTEAD THROUGH 1245 PM EDT.

SMALL HAIL...HEAVY DOWNPOURS...CLOUD-TO-GROUND LIGHTNING AND GUSTY
WINDS OF 35 TO 45 MPH CAN BE EXPECTED.

HAYES
Special weather statement, Jul 15, 11:49 AM EDT, 1 hour 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
1149 AM EDT SUN JUL 15 2007

MEZ018-019-NHZ006-010-151645-
INTERIOR CUMBERLAND-INTERIOR YORK-SOUTHERN CARROLL-STRAFFORD-
1149 AM EDT SUN JUL 15 2007

...STRONG THUNDERSTORMS WILL IMPACT STRAFFORD COUNTY...YORK COUNTY...
CUMBERLAND COUNTY AND CARROLL COUNTY THROUGH 1245 PM EDT...

AT 1149 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 3 MILES NORTHWEST OF MIDDLETON...MOVING
NORTHEAST AT 30 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN
AND AROUND MIDDLETON...BROOKFIELD...WAKEFIELD...ACTON...
SHAPLEIGH...NEWFIELD...LIMERICK...HOLLIS AND LIMINGTON THROUGH 1245
PM EDT.

SMALL HAIL...HEAVY DOWNPOURS...CLOUD-TO-GROUND LIGHTNING AND GUSTY
WINDS OF 35 TO 45 MPH CAN BE EXPECTED.

HAYES
Special weather statement, Jul 15, 11:58 AM EDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
1158 AM EDT SUN JUL 15 2007

MEZ019>021-024>026-151700-
ANDROSCOGGIN-COASTAL CUMBERLAND-INTERIOR
CUMBERLAND-KENNEBEC-LINCOLN-SAGADAHOC-
1158 AM EDT SUN JUL 15 2007

...STRONG THUNDERSTORMS WILL IMPACT ANDROSCOGGIN COUNTY...KENNEBEC
COUNTY...SAGADAHOC COUNTY...CUMBERLAND COUNTY AND LINCOLN COUNTY
THROUGH 100 PM EDT...

AT 1158 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES SOUTHWEST OF RAYMOND...MOVING
NORTHEAST AT 35 MPH. THIS STRONG THUNDERSTORM WILL AFFECT NORTH
WINDHAM...NAPLES...CASCO...RAYMOND...GRAY...POWNAL...NORTH
YARMOUTH...NEW GLOUCESTER...LEWISTON AND AUBURN THROUGH 100 PM EDT.

SMALL INCH...HEAVY DOWNPOURS...CLOUD-TO-GROUND LIGHTNING AND GUSTY
WINDS OF 35 TO 45 MPH CAN BE EXPECTED.

HAYES
Special weather statement, Jul 15, 1:13 PM EDT, 19 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 12:30 PM EDTSevere Thunderstorm WarningGYXYork60 min
Jul 15, 1:08 PM EDTSpecial Marine WarningGYX67 min
Jul 15, 2:12 PM EDTSpecial Marine WarningGYX63 min
Jul 15, 3:06 PM EDTSevere Thunderstorm WarningGYXYork39 min
Jul 15, 3:20 PM EDTSpecial Marine WarningGYX55 min
Jul 15, 3:23 PM EDTSevere Thunderstorm WarningGYXCumberland52 min
Jul 15, 7:26 PM EDTSevere Thunderstorm WarningGYXSomerset49 min
Jul 15, 12:25 PM EDTSevere Thunderstorm WarningGYXStrafford35 min
Jul 15, 12:59 PM EDTSevere Thunderstorm WarningGYXMerrimack46 min
Jul 15, 1:04 PM EDTSevere Thunderstorm WarningGYXRockingham41 min
Jul 15, 1:16 PM EDTSevere Thunderstorm WarningGYXStrafford44 min
Jul 15, 1:59 PM EDTSevere Thunderstorm WarningGYXSullivan46 min
Jul 15, 2:11 PM EDTSevere Thunderstorm WarningGYXMerrimack64 min
Jul 15, 2:29 PM EDTSevere Thunderstorm WarningGYXBelknap46 min
Jul 15, 3:08 PM EDTSevere Thunderstorm WarningGYXCarroll28 min

Nearby

Severe Thunderstorm Warnings in Maine, 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.