WXALERT: Tornado Watch for Northeast Iowa

untitledThe Storm Prediction Center in Norman, OK has issued a tornado watch for northeast Iowa until 4:00 AM Friday Morning.  It’s expected that the watch will be cancelled long before that 4:00 AM timeframe.

Rapid thunderstorm development is expected over the next 1-3 hours.

The following is the raw text on the warning from the Storm Prediction Center:

TORNADOES…HAIL TO 2.5 INCHES IN DIAMETER…THUNDERSTORM WIND
GUSTS TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH OF LA CROSSE
WISCONSIN TO 50 MILES SOUTH SOUTHWEST OF LONEROCK WISCONSIN. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER…A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION…CONTINUE…WW 465WW 467WW
468
WW 469WW 470

DISCUSSION…ISOLATED THUNDERSTORMS ARE BEGINNING TO DEVELOP OVER NE
IA/SW WI ALONG AN INSTABILITY GRADIENT/DIFFUSE WARM FRONT NEAR THE
MS RIVER. DESPITE THE LOSS OF DAYTIME HEATING…STRONG INSTABILITY
REMAINS OVER THIS AREA…AND VERTICAL SHEAR IS FAVORABLE FOR
SUPERCELLS. GIVEN THE POTENTIAL FOR CONVECTION TO BECOME ROOTED IN
THE NEAR-SURFACE LAYER WITH DEW POINTS IN THE 70S…SUPERCELLS WILL
BE CAPABLE OF PRODUCING A FEW TORNADOES AND VERY LARGE HAIL. LATER
TONIGHT…CONVECTION COULD ALSO MOVE INTO THIS AREA FROM THE W/NW IN
THE FORM OF AN MCS WITH AN ACCOMPANYING THREAT FOR DAMAGING WINDS
AND LARGE HAIL.

AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28025.

Leave a Reply

%d bloggers like this: