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227

ACUS01 KWNS 210054

SWODY1

SPC AC 210052



DAY 1 CONVECTIVE OUTLOOK  

NWS STORM PREDICTION CENTER NORMAN OK

0752 PM CDT SAT MAR 20 2010



VALID 210100Z - 211200Z



...NO SVR TSTM AREAS FORECAST...



...SYNOPSIS...

WATER VAPOR IMAGERY/00Z UPPER AIR ANALYSIS SHOWS A DEEPENING

SHORTWAVE TROUGH/CLOSED LOW TRACKING EWD ALONG THE RED RIVER /OK/TX

BORDER/...WITH 100 METER 500 MB HEIGHT FALLS OBSERVED AT OUN SINCE

12Z TODAY.  MODELS REMAIN CONSISTENT INDICATING FURTHER

INTENSIFICATION OF THIS SYSTEM TONIGHT WITH 180 METER HEIGHT FALLS

INTO THE LOWER MS VALLEY.  CLOSED LOW PROGGED TO REACH THE ARKLATEX

REGION BY 12Z SUNDAY.  EARLY EVENING SURFACE ANALYSIS SHOWED AN AREA

OF LOW PRESSURE OVER AR WITH A COLD FRONT TRAILING SSWWD THROUGH LA

INTO THE WRN GULF OF MEXICO.  THE SURFACE LOW SHOULD SLOWLY DEEPEN

AND SHIFT NEWD INTO NERN AR THIS FORECAST PERIOD... WHILE THE COLD

FRONT PUSHES EWD INTO ERN MS TO SWRN AL BY 12Z SUNDAY.  



MEANWHILE...THE TSTM ACTIVITY LOCATED OVER FAR SERN LA INTO THE

NORTH CENTRAL GULF EARLY THIS EVENING APPEARS TO BE ATTENDANT TO A

WEAKER SRN STREAM SHORTWAVE TROUGH EXPECTED TO REACH GA BY 12Z

SUNDAY.  GIVEN THE TRACK OF THIS IMPULSE AND INCREASING LOW LEVEL

WAA INTO SRN AL/FL PANHANDLE OVERNIGHT...THE GENERAL TSTM LINE HAS

BEEN EXTENDED EWD.



...MS DELTA/CENTRAL GULF COAST...

MODELS SUGGEST A SUB-SYNOPTIC SURFACE LOW WILL TRACK ENEWD ACROSS

FAR SERN LA LATE THIS EVENING/EARLY OVERNIGHT AND REACH SWRN AL

COAST BY THE END OF THE PERIOD.  THIS SECONDARY LOW SHOULD MARK THE

NRN EXTENT OF GREATER LOW LEVEL MOISTURE /SURFACE DEWPOINTS AROUND

60/ WHICH ARE CURRENTLY LOCATED OFFSHORE.  SLY LLJ STRENGTHENING

INTO CENTRAL GULF COAST REGION TONIGHT IN RESPONSE TO APPROACH OF

DEEPENING MID-UPPER LEVEL LOW WILL ADVECT MOISTURE NWD TO THE

COASTAL AREAS OF SERN LA TO SWRN AL/FAR WRN FL PANHANDLE.  THIS

COMBINED WITH INCREASING LOW LEVEL WAA WILL AID IN DESTABILIZATION

FOR CONVECTIVE DEVELOPMENT...BUT WEAK LAPSE RATES WILL CONTINUE TO

LIMIT THE DEVELOPMENT OF STRONGER INSTABILITY.  



ALTHOUGH FORECAST SOUNDINGS SUGGEST STORMS NEAR AND INLAND OF THE

COAST SHOULD BE PRIMARILY ELEVATED...INCREASING HODOGRAPH CURVATURE

ALONG LLJ WITH 0-1 KM SHEAR AROUND 25-30 KT WOULD SUPPORT AN

ISOLATED SEVERE THREAT/NON-ZERO POTENTIAL FOR LOW LEVEL STORM

ROTATION.  THUS...WILL KEEP VERY LOW TORNADO AND WIND PROBABILITIES

IN THE 01Z OUTLOOK ISSUANCE.



..PETERS.. 03/21/2010








        
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