Alert archive / Maine / Tornado Warnings in 2010

Tornado Warning 5, NWS Gray, ME

July 21, 2010Cumberland County, Maine

NWS Gray, ME issued this tornado warning at Jul 21, 2010, 7:03 PM EDT for Cumberland County, Maine. It was in force for 27 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 21, 2010, 7:03 PM EDT (23:03 UTC)
Expired: Jul 21, 2010, 7:30 PM EDT
In force: 27 min
Issued by: NWS Gray, ME
Area: Storm-based polygon

County Cumberland County, ME

The radar

The Portland,ME radar (KGYX), 11 km from the middle of the area, began a volume at 23:05 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.

Issued	Product	Office	Lasted
Jul 21, 11:27 AM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 11.1 hours before the alert went out and 11 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 77 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 132 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 tornado 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 tornado warning went out at Jul 21, 5:36 PM EDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jul 21, 5:36 PM EDT, 1 hour 27 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE GRAY ME
536 PM EDT WED JUL 21 2010

.SYNOPSIS...
SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS EVENING AS A COLD
FRONT APPROACHES FROM THE WEST. THE COLD FRONT WILL CROSS NEW
HAMPSHIRE AND MAINE OVERNIGHT. HIGH PRESSURE WILL BUILD IN FROM
THE WEST THURSDAY...AND PRODUCE A COOLER AND DRIER DAY WITH A
GUSTY NORTHWEST WIND. HUMIDITY BEGINS TO INCREASE AGAIN IN FRIDAY. A
WEAK WARM FRONT WILL APPROACH FROM THE SOUTHWEST FRIDAY NIGHT AND
WILL STALL OVER NORTHERN AND CENTRAL MAINE ON SATURDAY. A COLD
FRONT WILL CROSS THE REGION SATURDAY NIGHT AS INTENSIFYING LOW
PRESSURE CROSSES SOUTHERN QUEBEC. A STRONG NORTHWEST FLOW WILL SET
UP BEHIND THE FRONT ON SUNDAY. HIGH PRESSURE WILL BUILD OVER THE
REGION MONDAY AND TUESDAY.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
---UPDATED---
PRIMARY FORECAST CONCERN IS OBVIOUSLY THE ONGOING SEVERE WEATHER
EVENT. STORMS CURRENTLY MOVING ACROSS NORTHERN NEW HAMPSHIRE AND
SOUTHERN MAINE. EXPECT THAT WE MAY SEE SOME ADDITIONAL
DEVELOPMENT OVER SOUTHERN NEW HAMPSHIRE WHERE THE COLUMN HAS NOT
BEEN WORKED OVER YET. STORMS WILL LIKELY CONTINUE INTO THE EVENING
HOURS...BUT SHOULD BEGIN TO WANE AS WE MOVE FURTHER AWAY FROM
DIURNAL HEATING. HAVE UPDATED THE FORECAST TO ADJUST POPS A BIT
TO BETTER REFLECT WHERE CONVECTION IS OCCURING. ANOTHER ISSUE THAT
POPPED UP WAS THE SPEED WITH WHICH THE FOG AND STRATUS CAME
ONSHORE. HAVE ADDED AREAS OF FOG TO THE FORECAST ALONG COASTAL
AREAS.

/PREVIOUS DISCUSSION.../
SVR THREAT CONTINUES ACROSS THE ENTIRE CWA. ATTM...BEST ASCENT
ASSOCIATED WITH THIS SYSTEM COMING THROUGH NY STATE...AND WILL
MOVE EAST OVER THE NEXT SEVERAL HOURS...AND THEREFORE EXPECT
STORMS TO INTENSIFY OVER NH AND EVENTUALLY WORK INTO ME. COLD AIR
ALOFT...AND WARM SFC TEMPS EXPECTED TO PROVIDE ENOUGH INSTABILITY
TOT AP INTO STRONGER WINDS ALOFT. WILL LKLY SEE CONVECTION
CONTINUE THRU THE 00Z WATCH EXPIRATION TIME...AND PERHAPS A LITTLE
BEYOND THAT. EXPECTING SOME FOG DEVELOPMENT BEYOND THE STORMS AS
ACTUAL SFC FRONT WILL LAG A FEW HOURS BEHIND. WILL START TO SEE
SOME CLEARING IN WRN ZONES AFTER MIDNIGHT.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
ANY LINGERING CLOUDS WILL BREAK UPS SHORTLY AFTER SUNRISE AS NW
WINDS PICK UP AND BEGIN TO GUST TO 25 MPH OR SO. SOME MTN
CLOUDS/SHRA WILL BE POSSIBLE DUE TO COLD AIR ALOFT AND TERRAIN
INFLUENCES. OTHERWISE...MAINLY SUNNY...DRIER AND BREEZY CONDITIONS
ARE IN STORE.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
HIGH PRESSURE CRESTS OVER THE REGION THURSDAY NIGHT BRINGING
MOSTLY CLEAR SKIES AND LIGHT WINDS. OVERNIGHT LOWS SHOULD BE
MOSTLY IN THE 50S...WITH SOME UPPER 40S ALONG NORTHERN MOUNTAIN
VALLEYS AND LOWER 60S ALONG THE NEW HAMPSHIRE SEACOAST.

CLOUD COVER AND RELATIVE HUMIDITY INCREASES FRIDAY AFTERNOON AS A
WARM FRONT APPROACHES THE AREA. DAYTIME HIGH TEMPERATURES WILL
REACH INTO THE 70S TO AROUND 80.

SCATTERED SHOWERS AND THUNDERSTORMS RETURN FRIDAY NIGHT AND
SATURDAY AS A LOW PRESSURE SYSTEM PASSES JUST TO THE NORTH OF THE
FORECAST AREA. SHOWERS COULD BECOME MORE NUMEROUS SATURDAY NIGHT
AS A COLD FRONT PUSHES THROUGH THE REGION. DRIER WEATHER RETURNS
EARLY NEXT WEEK AS A LARGE HIGH PRESSURE AREA MOVES EAST FROM THE
GREAT LAKES. TEMPERATURES SHOULD BE NEAR SEASONAL NORMALS EXCEPT
FOR ABOVE NORMAL MINIMUM TEMPERATURES DURING THE WEEKEND.

&&

.AVIATION /22Z WEDNESDAY THROUGH MONDAY/...
SHORT TERM...EXPECT SCT TSRA BY THE AFTERNOON WITH PERIODS OF MVFR IN
HEAVY RAIN AND BR...ENDING BY AROUND MIDNIGHT...LOW CLOUDS AND FOG
LOOK TO KEEP IFR CONDITIONS IN FOR MOST OF THE OVERNIGHT. VFR
RETURNS THURSDAY WITH GUSTY NW WINDS.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
VFR CONDITIONS CONTINUE THURSDAY NIGHT AND FRIDAY. SCATTERED
SHOWERS AND THUNDERSTORMS WITH ASSOCIATED MVFR/IFR CONDITIONS MOVE
BACK IN FRIDAY NIGHT AND SATURDAY. VFR CONDITIONS RETURN FOR
SUNDAY AND MONDAY.

&&

.MARINE...
SHORT TERM...WINDS AND SEAS BELOW SCA CRITERIA...BUT STRONG TO
SEVERE STORMS WILL BE POSSIBLE INTO THIS EVENING...WITH GUSTY AND
FREQUENT LIGHTNING.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/....WINDS AND SEAS SHOULD
REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA THROUGH MONDAY.

&&

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

&&

NEAR TERM...POHL

Hazardous weather outlook, Jul 21, 11:44 AM EDT, 7 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAY ME
1144 AM EDT WED JUL 21 2010

MEZ007>009-012>014-018>028-NHZ001>010-013-014-221545-
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-
1144 AM EDT WED JUL 21 2010

...SEVERE THUNDERSTORM WATCH 507 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

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

.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...THURSDAY THROUGH TUESDAY

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>154-221545-
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-
1144 AM EDT WED JUL 21 2010

...SEVERE THUNDERSTORM WATCH 507 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

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

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...THURSDAY THROUGH TUESDAY

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

Local storm report, Jul 21, 5:33 PM EDT, 1 hour 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
533 PM EDT WED JUL 21 2010

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

0410 PM     HAIL             WARREN                  43.92N 71.89W
07/21/2010  E1.00 INCH       GRAFTON            NH   PUBLIC

            PUBLIC REPORTS QUARTER SIZE HAIL FELL FOR 10 MINUTES IN
            WARREN.

0454 PM     TSTM WND DMG     5 S PIERMONT            43.90N 72.09W
07/21/2010                   GRAFTON            NH   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED NUMEROUS DOWNED TREE LIMBS AND
            DIME SIZED HAIL IN ORFORD.

&&

DAG

Local storm report, Jul 21, 5:36 PM EDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GRAY ME
536 PM EDT WED JUL 21 2010

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

0510 PM     HAIL             WARREN                  43.92N 71.89W
07/21/2010  E1.00 INCH       GRAFTON            NH   PUBLIC

            PUBLIC REPORTS QUARTER SIZE HAIL FELL FOR 10 MINUTES IN
            WARREN.

&&

DAG

Local storm report, Jul 21, 5:53 PM EDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
553 PM EDT WED JUL 21 2010

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

0538 PM     HAIL             N THORNTON              43.89N 71.68W
07/21/2010  E1.00 INCH       GRAFTON            NH   PUBLIC

            PUBLIC REPORTS ONE INCH HAIL IN THORNTON.

&&

DAG

Local storm report, Jul 21, 6:21 PM EDT, 42 minutes before

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Local storm report, Jul 21, 6:52 PM EDT, 11 minutes before

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Local storm report, Jul 21, 6:54 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
654 PM EDT WED JUL 21 2010

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

0622 PM     TSTM WND DMG     LIMERICK                43.69N 70.79W
07/21/2010                   YORK               ME   AIRPLANE PILOT

            YORK COUNTY EMERGENCY MANAGER REPORTED 2 MILES OF DOWNED
            TREES ON FOSS ROAD AND RANGE E ROAD NEAR LIMERICK. TIME
            BASED ON RADAR.

&&

DAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:46 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	44 min
Jul 21, 4:14 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford	46 min
Jul 21, 4:25 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, York	50 min
Jul 21, 4:55 PM EDT	Areal Flood Advisory	GYX	Oxford	3 hr
Jul 21, 5:11 PM EDT	Special Marine Warning	GYX		49 min
Jul 21, 5:17 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Somerset	43 min
Jul 21, 5:49 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Lincoln, Sagadahoc	41 min
Jul 21, 5:49 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Cumberland, Oxford	71 min
Jul 21, 6:03 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	42 min
Jul 21, 6:17 PM EDT	Tornado Warning	GYX	Cumberland, York	28 min
Jul 21, 6:50 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Cumberland, Oxford, Sagadahoc	40 min
Jul 21, 7:02 PM EDT	Severe Thunderstorm Warning	GYX	York	88 min
Jul 21, 7:14 PM EDT	Tornado Warning	GYX	Cumberland, York	46 min
Jul 21, 7:18 PM EDT	Special Marine Warning	GYX		27 min
Jul 21, 7:29 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Cumberland, Sagadahoc	46 min
Jul 21, 7:46 PM EDT	Special Marine Warning	GYX		59 min
Jul 21, 7:53 PM EDT	Special Marine Warning	GYX		67 min
Jul 21, 4:35 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	85 min
Jul 21, 4:42 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Coos, Grafton	63 min
Jul 21, 5:44 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	91 min
Jul 21, 5:46 PM EDT	Areal Flood Advisory	GYX	Grafton	3 hr
Jul 21, 6:19 PM EDT	Tornado Warning	GYX	Carroll	56 min
Jul 21, 7:28 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Grafton, Merrimack, Rockingham, Sullivan	92 min

Nearby

Tornado Warnings in Maine, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.