Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 472
NWS STORM PREDICTION CENTER NORMAN OK
1050 PM CDT THU JUN 18 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF EAST-CENTRAL AND SOUTHERN MINNESOTA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1050 PM
UNTIL 500 AM CDT.
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 APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH
SOUTHWEST OF REDWOOD FALLS MINNESOTA TO 15 MILES NORTHEAST OF
MINNEAPOLIS MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
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...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 467. WATCH NUMBER 467 WILL NOT BE IN EFFECT
AFTER 1050 PM CDT. CONTINUE...WW 469...WW 470...WW 471...
DISCUSSION...MOIST/MODERATELY-UNSTABLE AIRMASS PERSISTS ACROSS PARTS
OF THE SRN HALF OF MN...AHEAD OF A NE-SW BAND OF SCATTERED SHOWERS
AND THUNDERSTORMS. WHILE THIS CONVECTION HAS WEAKENED OVER THE PAST
COUPLE OF HOURS...WELL-DEFINED UPPER SYSTEM CENTERED OVER NRN MN
CONTINUES TO SHIFT SLOWLY EWD -- WHICH SHOULD CONTINUE TO SUPPORT
SOME POTENTIAL FOR CONVECTIVE REDEVELOPMENT OVER THE NEXT FEW HOURS.
WITH FAVORABLE SHEAR IN PLACE ACROSS THE AREA...ANY DEVELOPING
STORMS WOULD LIKELY BECOME SUPERCELLULAR -- ALONG WITH ASSOCIATED
POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS. IN
ADDITION...LOW-LEVEL VEERING WITH HEIGHT SUGGESTS A LIMITED THREAT
FOR AN ISOLATED/BRIEF TORNADO WITH ANY SUSTAINED SUPERCELL.
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.
...GOSS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 472 SEVERE TSTM MN 190350Z - 191000Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
40SSW RWF/REDWOOD FALLS MN/ - 15NE MSP/MINNEAPOLIS MN/
..AVIATION COORDS.. 50NM N/S /30SSW RWF - 13NE MSP/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 26030.
REPLACES WW 467..MN
LAT...LON 44889538 45909300 44159300 43159538
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 472 Status Report Messages:
STATUS REPORT #1 ON WW 472
VALID 190745Z - 190840Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..06/19/09
ATTN...WFO...MPX...
&&
STATUS REPORT FOR WS 472
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC003-013-015-019-025-037-043-047-049-053-059-079-085-091-093-
103-123-127-129-131-139-141-143-147-161-163-165-171-190840-
MN
. MINNESOTA COUNTIES INCLUDED ARE
ANOKA BLUE EARTH BROWN
CARVER CHISAGO DAKOTA
FARIBAULT FREEBORN GOODHUE
HENNEPIN ISANTI LE SUEUR
MCLEOD MARTIN MEEKER
NICOLLET RAMSEY REDWOOD
RENVILLE RICE SCOTT
SHERBURNE SIBLEY STEELE
WASECA WASHINGTON WATONWAN
WRIGHT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Low (20%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (20%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.