STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
DAY 2 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWI47 KWNS.
VALID 171200Z - 181200Z
THERE IS A MDT RISK OF SVR TSTMS TOMORROW AFTERNOON AND EVENING
ACROSS PARTS OF EXTREME S CENTRAL KS...CENTRAL AND SERN OK...NERN
TX...AND SWRN AR. THE MDT RISK AREA IS TO THE RIGHT OF A LINE FROM
30 SE DDC 35 NW P28 35 NNW PNC 25 SW BVO 25 W FSM 45 WSW HOT
30 NNE SHV 20 NW LFK 60 NNE CLL 20 SSE DAL 15 SSE ADM 20 SSE OKC
45 WNW END 50 NNE GAG 30 SE DDC.
SURROUNDING THE MDT RISK AREA...THERE IS A SLGT RISK OF SVR TSTMS
TO THE RIGHT OF A LINE FROM 40 SW PSX 30 N BWD 35 NNW CSM 20 NNW
LBL 35 WSW IML 40 WNW LBF 15 SW BUB 25 ESE GRI 20 NNE CNU 20 NNE
FYV 30 NW LIT 45 SW JAN 25 SSW LUL 50 NNW PNS 25 SSW ABY 10 W AYS
25 NNE JAX.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 SSW CRP HDO SJT
50 E BGS 50 SSW CDS 20 S AMA 35 E 4CR 65 SSW GNT 20 NE BLH
25 E EDW 15 ENE BFL 30 NW PRB 35 SSE UKI 55 NW RBL 70 NNW 4LW
40 NE EPH 15 NNW 63S 30 NE GEG 65 NNE BOI 20 N PIH 25 NNE U28
30 NE GJT 45 NNW 4FC 35 SSW BFF 20 W RAP 35 NW Y22 FAR STC
45 NNE ALO 30 WSW UIN 35 SSE POF 35 NW MSL 15 S GSP HSE.
...SYNOPSIS...
LARGE / NEGATIVELY-TILTED MID-LEVEL TROUGH IS FORECAST TO EXTEND
FROM THE PAC NW SEWD INTO THE SRN HIGH PLAINS AT THE START OF THE
PERIOD. WITH TIME...CLOSED LOW IS FORECAST TO DEVELOP OVER THE SRN
ROCKIES AND THEN SHIFT EWD INTO THE SRN HIGH PLAINS BY THE END OF
THE PERIOD. STRONG / DEEP-LAYER WLY FLOW IS FORECAST ACROSS THE
SRN ROCKIES AT THE START OF THE PERIOD...AND IS FORECAST TO SPREAD
EWD ACROSS TX WITH TIME. MEANWHILE...FLOW ALOFT IS EXPECTED TO
REMAIN MORE SLY NORTH OF THE RED RIVER ALONG ERN FRINGES OF UPPER
TROUGH / LOW.
AT THE SURFACE...LOW INITIALLY FORECAST ACROSS ERN CO / WRN KS IS
FORECAST TO DEEPEN / SHIFT SLIGHTLY SWD WITH TIME...BECOMING
CENTERED OVER THE OK PNHDL BY THE END OF THE PERIOD. A DRYLINE
INITIALLY OVER W CENTRAL TX / THE ERN TX PANHANDLE IS FORECAST TO
SURGE EWD THROUGH CENTRAL TX DURING THE DAY WITH THE EWD ADVECTION
OF DRY AIR ALOFT -- FOLLOWED EVENTUALLY BY A COLD FRONT WHICH
SHOULD MOVE INTO CENTRAL TX BY THE END OF THE PERIOD.
...SRN PLAINS...
LOW-LEVEL MOIST ADVECTION ACROSS CENTRAL AND ERN TX / OK WILL BE
UNDERWAY AT THE START OF THE PERIOD ON SLY / SELY FLOW AHEAD OF
SURFACE DRYLINE. BY AFTERNOON...DEWPOINTS ARE FORECAST TO INCREASE
INTO THE LOW 60S OVER OK AND LOW TO MID 60S ACROSS ERN TX BENEATH
STEEP LAPSE RATES FORECAST TO BE IN PLACE OVER THIS REGION...
YIELDING MEAN-LAYER CAPE AROUND 1000 J/KG.
STRONG LOW-LEVEL CONVERGENCE ALONG DRYLINE COMBINED WITH STRONGLY
DIFFLUENT FLOW ALOFT ACROSS THIS REGION WILL YIELD SUFFICIENT UVV
FOR THUNDERSTORM DEVELOPMENT BY EARLY AFTERNOON FROM NRN / NERN TX
INTO CENTRAL AND ERN OK. LOW-LEVEL WINDS ARE EXPECTED TO VEER WITH
HEIGHT ACROSS THE REGION...ALTHOUGH MORE MERIDIONAL FLOW IS
EXPECTED ALOFT FROM CENTRAL OK INTO SRN KS. THIS COMBINED WITH
STEEPER MID-LEVEL LAPSE RATES ACROSS THIS REGION SUGGEST THE
GREATEST SEVERE THREAT WILL LIKELY BE LARGE HAIL ALONG WITH LOCALLY
DAMAGING WINDS.
IN ADDITION TO THE HAIL / WIND THREAT...GREATEST SUPERCELL TORNADO
THREAT APPEARS TO EXIST ACROSS E TX INTO SERN OK DURING THE DAY --
AND PERHAPS EWD INTO SWRN AR / NWRN LA THROUGH THE EVENING.
GREATER LOW-LEVEL MOISTURE IS FORECAST ACROSS THIS REGION
SUGGESTING SOMEWHAT LOWER CLOUD BASES ACROSS THIS REGION...AND MORE
WLY WINDS ALOFT SHOULD PROVIDE A MORE FAVORABLE / DEEPLY-VEERING
WIND PROFILE.
...CENTRAL PLAINS...
DEEP-LAYER SELY WIND FIELD IS FORECAST FROM KS NWD INTO NEB THIS
PERIOD NORTHEAST OF DEVELOPING MID-LEVEL LOW. HOWEVER...WIND FIELD
WILL LIKELY BE STRONG ENOUGH FOR AT LEAST MULTICELL STORM
ORGANIZATION. STORMS ARE FORECAST TO DEVELOP ACROSS THIS REGION
DURING THE AFTERNOON IN MARGINALLY-UNSTABLE AIRMASS IN BROAD REGION
OF UVV NORTHEAST OF UPPER VORT MAX MOVING NWD ACROSS THE CENTRAL /
SRN HIGH PLAINS. LARGE HAIL WILL LIKELY BE THE PRIMARY SEVERE
THREAT GIVEN STEEP LAPSE RATES / COOL TEMPERATURES ALOFT...ALTHOUGH
RELATIVELY DRY AIR AT LOW-LEVELS SUGGESTS A THREAT FOR LOCALLY
DAMAGING WINDS AS WELL.
...GULF COAST INTO FL...
STRONG VORT MAX IS INDICATED ATTM ACROSS THE CENTRAL GULF -- AND
THIS FEATURE IS FORECAST TO MOVE SLOWLY NEWD INTO THE ERN GULF
COASTAL REGION DURING THE DAY 2 PERIOD. MID-LEVEL LAPSE RATES IN
THE 6 TO 6.5 C/KM RANGE COMBINED WITH SURFACE DEWPOINTS IN THE LOW
60S WILL RESULT IN MARGINAL INSTABILITY SUPPORTIVE OF WIDESPREAD
THUNDERSTORMS AS VORT MAX APPROACHES. MODERATE / WLY DEEP-LAYER
WIND FIELD IS FORECAST...WHICH SUGGESTS PRIMARY SEVERE THREATS WILL
BE MARGINALLY-SEVERE HAIL AND LOCALLY DAMAGING WINDS.
..GOSS.. 03/16/03
NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED FOR 0800Z
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