STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS.
VALID 101630Z - 111200Z
THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
45 W TCC 20 SW CVS 10 NNW HOB 30 W CNM 25 SSW ALM 25 ENE ONM
35 SSE SAF 45 W TCC.
THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
15 SW ERI 15 SSE PIT 45 ENE EKN 45 SSW DCA 15 ENE WAL ...CONT...
25 SE SAV 30 SW TOI 35 ENE CLL 40 NW TPL 50 NNW FTW 40 N PRX
60 W UOX 40 NE MKL 45 SSE CGX 35 NNE BEH 15 SSW MBL 25 ENE TVC
10 ENE APN.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 35 WSW FHU
45 SSE SOW 25 NNE GNT 15 SW ALS TAD 15 NW PVW 50 SSE CDS
20 ENE MLC 50 SSW BLV DEC 15 NNE MMO 50 SW LSE 10 NE P24 55 N ISN
...CONT... 15 W MSS 15 ENE UCA 15 E MSV 20 E JFK.
...SYNOPSIS...
VORT MAX OVER ERN WI WILL EJECT ENEWD THROUGH THE GREAT LAKES AS A
STRONGER UPSTREAM VORT MAX MOVES INTO THE MEAN TROUGH POSITION. SRN
EXTENSION OF UPPER TROUGH WILL CONTINUE EWD THROUGH THE OH VALLEY
THIS AFTERNOON. AT THE SURFACE A COLD FRONT EXTENDS SWWD THROUGH
THE MID MS VALLEY AND INTO THE SRN PLAINS FROM A SURFACE LOW IN ERN
WI. A WARM FRONT EXTENDS SEWD FROM THE LOW THROUGH SRN MI...NRN OH
AND INTO NRN VA.
...GREAT LAKES AND OH VALLEY AREA...
WIDESPREAD CLOUDS WILL LIMIT OR DELAY DESTABILIZATION OVER MUCH OF
THIS AREA TODAY. LOW LEVEL FLOW CONTINUES TO VEER OVER THE OH
VALLEY IN PRE-FRONTAL WARM SECTOR AS THE SURFACE LOW DEEPENS AND
BEGINS TO LIFT NEWD THROUGH THE GREAT LAKES. DESPITE THE LIMITING
FACTORS...BREAKS IN CLOUDS TODAY WILL ALLOW SOME DESTABILIZATION...
BUT WARM TEMPERATURES ALOFT AND MARGINAL LAPSE RATES SHOULD LIMIT
OVERALL DEGREE OF INSTABILITY TO GENERALLY AOB 2000 J/KG MLCAPE.
STRONGER STORMS ARE ALREADY DEVELOPING OVER KY ALONG REMNANT
BOUNDARY AND E OF A SMALL MCV WHERE ATMOSPHERE HAS BECOME
MODERATELY UNSTABLE. OTHER STORMS WILL MAY DEVELOP/INTENSIFY
FARTHER N IN ZONE OF FAVORABLE LARGE SCALE ASCENT AS LOW CLOUDS MIX
OUT...ESPECIALLY ACROSS PARTS OF MI INTO OH WHERE STRONGER LOW
LEVEL CONVERGENCE WILL EXIST.
VEERING LOW LEVEL FLOW WITH TIME WILL LIMIT DEEP SHEAR TO AOB 30 KT
OVER MUCH OF THE AREA. HOWEVER..MODERATE WLY FLOW ON SRN PERIPHERY
OF UPPER TROUGH WILL BE SUFFICIENT FOR STORMS TO ORGANIZE INTO
LINES WITH DAMAGING WIND THE MAIN THREAT. STRONGER SHEAR IS
EXPECTED OVER PARTS OF LOWER MI SEWD INTO OH IN VICINITY OF WARM
FRONT WHERE LOW LEVEL FLOW WILL REMAIN BACKED TO SELY...BUT
SUPERCELL THREAT IN THIS AREA IS CONDITIONAL ON THE ABILITY OF THE
LOW CLOUDS TO MIX OUT.
...SERN U.S....
MORNING RAOB DATA SHOWED STRONG INSTABILITY AND MODERATELY STEEP
LAPSE RATES OVER MUCH OF THE SERN U.S.. THE ATMOSPHERE WILL
CONTINUE TO DESTABILIZE AS SURFACE HEATING CONTINUES WITH MLCAPES
AROUND 3000 J/KG. A WELL DEFINED MCV WAS MOVING EWD THROUGH WRN TN
AND STORMS MAY INTENSIFY AHEAD OF THIS FEATURE AS INSTABILITY
INCREASES. OTHER STORMS ARE DEVELOPING ALONG NUMEROUS OUTFLOW
BOUNDARIES AND FLOW IS SUFFICIENT FOR STORMS TO ORGANIZE INTO LINES
OR LINE SEGMENTS. DAMAGING WIND IS THE MAIN THREAT.
...SRN NM...
ELY UPSLOPE FLOW HAS DEVELOPED IN POST FRONTAL REGION AND THIS WILL
MAINTAIN AXIS OF HIGHER DEWPOINTS OVER ERN NM. STORMS MAY DEVELOP
OVER THE HIGHER TERRAIN AS THE ATMOSPHERE CONTINUES TO DESTABILIZE
LATER THIS AFTERNOON. PRIMARY LIMITING FACTOR IS LARGE SCALE
SUBSIDENCE ASSOCIATED WITH UPPER RIDGE AND NLY STEERING FLOW E OF
UPPER RIDGE AXIS WHICH MAY LIMIT ABILITY OF STORMS TO DEVELOP EWD
OVER THE LOWER TERRAIN AND INTO THE MOIST AXIS.
..DIAL.. 07/10/03
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED FOR 2000Z
|