WATCHES: Tornado Watch Number 231

WWUS20 KWNS 272150
SEL1
SPC WW 272150
KSZ000-NEZ000-280500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 231
NWS STORM PREDICTION CENTER NORMAN OK
450 PM CDT MON MAY 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
NORTHERN KANSAS
SOUTHERN NEBRASKA

* EFFECTIVE THIS MONDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT CDT.

* PRIMARY THREATS INCLUDE...
NUMEROUS TORNADOES LIKELY WITH SEVERAL INTENSE TORNADOES
POSSIBLE
NUMEROUS VERY LARGE HAIL EVENTS TO 4 INCHES IN DIAMETER LIKELY
SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF
HASTINGS NEBRASKA TO 55 MILES SOUTHWEST OF CONCORDIA KANSAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 227...WW 228...WW
229...WW 230...

DISCUSSION...RAPID SUPERCELL DEVELOPMENT IS UNDERWAY IN A ZONE OF
LOW-LEVEL WAA ACROSS S CENTRAL NEB...AND ADDITIONAL SUPERCELLS
SHOULD FORM JUST NE OF THE TRIPLE POINT IN N CENTRAL KS WHERE
LOW-LEVEL CONVERGENCE IS MAXIMIZED ALONG THE INSTABILITY AXIS...AS
CONVECTIVE INHIBITION WEAKENS. THE COMBINATION OF MLCAPE OF
3500-4500 J/KG...EFFECTIVE BULK SHEAR OF 40-50 KT...EFFECTIVE SRH OF
250-400 M2/S2...AND BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S WILL
SUPPORT THE RISK OF A FEW STRONG TORNADOES AND VERY LARGE HAIL.
LATER THIS EVENING INTO TONIGHT...THE STORMS WILL LIKELY CONGEAL
INTO AN MCS AND MOVE EWD/ESEWD ALONG THE RESIDUAL OUTFLOW/WARM FRONT
INTO NE KS/SE NEB.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 27020.


...THOMPSON

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