[SWODY1] SWODY1

[Severe Weather Outlook Day 1]

ACUS01 KWNS 120044
SWODY1
SPC AC 120043

DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
0743 PM CDT TUE APR 11 2006

VALID 120100Z - 121200Z

...NO SVR TSTM AREAS FORECAST...

...MID-MO VLY NEWD INTO THE UPPER MS VLY...
HIGH-BASED TSTMS INITIATED LATE THIS AFTN ACROSS SERN NEB...ERN KS
AND SWRN IA ALONG A PRE-FRONTAL TROUGH.  THIS REGION EXPERIENCED THE
STRONGEST HEATING BENEATH UPPER LEVEL DRY SLOT AND WITHIN EXIT
REGION OF A 70-80 KT H5 JET STREAK.  00Z OMAHA SOUNDING EXHIBITED A
DEEPLY MIXED BOUNDARY LAYER WITH AROUND 400-500 J/KG MLCAPE.  THE
STEEP LAPSE RATE ENVIRONMENT...FAVORABLE VERTICAL SHEAR OF 40-50 KTS
AND DRY SUB-CLOUD LAYER HAS BEEN SUFFICIENT FOR A FEW MARGINALLY
SEVERE HAIL/WIND GUSTS.

THE SYNOPTIC COLD FRONT SHOULD STRENGTHEN AND PROGRESS EWD INTO THE
UPPER MS VLY OVERNIGHT AS THE UPPER LEVEL JET STREAK/STRONGER LARGE
SCALE ASCENT TRANSLATES ENEWD. THE BROKEN LINE OF TSTMS WILL
CONTINUE TO EXPAND ENEWD INTO/ACROSS EXTREME NRN MO AND CNTRL IA
THIS EVENING AND INTO THE UPPER MS VLY OVERNIGHT.  THOUGH TSTMS WILL
BE LIKELY ALONG/IMMEDIATELY BEHIND THE FRONT...THE ISOLD SEVERE
THREATS SHOULD DIMINISH AS THE STORMS MOVE BEYOND THE LOW-LEVEL
THERMAL RIDGE AXIS.

..RACY.. 04/12/2006