[LeArc] SPC MESOSCALE DISCUSSION 0532 FOR IA / NRN MO...

[Duane Whittingham]

SPC MESOSCALE DISCUSSION 0532 FOR IA / NRN MO...
CONCERNING...TORNADO WATCH 0158...
                 
VALID 272351Z - 280100Z
                 
THUNDERSTORMS ARE FORECAST TO CONTINUE ACROSS MUCH OF IA AND
ADJACENT NRN MO.  SEVERE THREAT IS EXPECTED TO PERSIST FOR THE NEXT
SEVERAL HOURS...AND A NEW TORNADO WATCH WILL LIKELY BE ISSUED TO
REPLACE WW 0158 PRIOR TO ITS 28/01Z EXPIRATION.
                 
LATEST SURFACE ANALYSIS SHOWS 988 MB LOW NEAR OMA...WITH A WARM
FRONT EXTENDING FROM THE LOW SEWD ACROSS N CENTRAL MO TOWARD STL.
ALTHOUGH WARM SECTOR REMAINS MODERATELY UNSTABLE...BOUNDARY LAYER
AIRMASS N OF WARM FRONT REMAINS STABLE -- WITH TEMPERATURES AND
DEWPOINTS GENERALLY IN THE 40S TO LOW 50S.  DESPITE LIMITED
INSTABILITY ACROSS MUCH OF WW ATTM...WARM FRONT IS FORECAST TO MOVE
NWD INTO SRN IA...WHICH WILL ALLOW SOME AIRMASS DESTABILIZATION.  
                 
ATTM...20 TO 25 KT SELY / ESELY SURFACE WINDS ARE OBSERVED -- WHICH
THEN RAPIDLY VEER TO SWLY AT 70 KTS ACCORDING TO LATEST DMX /DES
MOINES IA/ WSR-88D VWP -- RESULTING IN VERY FAVORABLE LOW-LEVEL
SHEAR FOR TORNADOES.  AS WARM FRONT MOVES NWD OVER THE NEXT SEVERAL
HOURS...AN INCREASE IN TORNADO THREAT ACROSS S CENTRAL AND SERN IA
IS EXPECTED.
                 
 ..GOSS.. 04/27/02
                 
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Duane Whittingham (N9SSN) - Producer
Tom and Darryl Radio Shows
Heard on C-Band Analog Satellite (W0KIE) - GE7-CH5-7.5 mHz
Also on WQNA 88.3 FM, WBCQ 7415 kHz and the Internet.
An Independent Freeform Eclectic Radio Show.
http://www.tomanddarryl.org