Alert archive / Maine / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 477

June 26, 20025 counties in Maine

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2002, 6:00 PM EDT for 5 counties in Maine. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2002, 6:00 PM EDT (22:00 UTC)
Expired: Jun 26, 2002, 10:00 PM EDT
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Franklin County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Somerset County, ME

The radar

The Portland,ME radar (KGYX), 170 km from the middle of the area, began a volume at 22:01 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

Gray, ME (KGYX), launched 12:00Z, 10.0 hours before the alert went out and 170 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: 42 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1168 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 262141
SEL7  
SPC WW 262136
MEZ000-270200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 477
STORM PREDICTION CENTER NORMAN OK
536 PM EDT WED JUN 26 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   CENTRAL MAINE                              

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 600 PM UNTIL
1000 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EITHER SIDE OF A LINE FROM 25 MILES NORTH NORTHWEST OF BERLIN NEW
HAMPSHIRE TO 60 MILES EAST NORTHEAST OF GREENVILLE MAINE.

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 472...WW 473...WW
474...WW 475...WW 476...

DISCUSSION...SEVERE THUNDERSTORMS PRODUCING LARGE HAIL AND DAMAGING
WINDS WILL REMAIN POSSIBLE THROUGH THE EVENING ACROSS CENTRAL
MAINE.  A MODERATELY UNSTABLE AIR MASS IS CURRENTLY IN PLACE...
ALONG WITH 25-35 KT OF DEEP LAYER SHEAR...WHICH WILL ENHANCE THE
CONVECTION.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 26030.


...EVANS

454,0714 463,0684 445,0680 440,0710

Nearby

Severe Thunderstorm Watches in Maine, 2002 Every severe thunderstorm watch in 2002

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.