
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0516 AM CST WED JAN 14 2004
VALID 161200Z - 171200Z
...THERE IS A SLGT RISK OF SVR TSTMS OVER PARTS OF SRN AND ERN TX...
...SYNOPSIS...
MID AND UPPER LEVEL SSWLY FLOW WILL STRENGTHEN AND DEEPEN OVER SRN
AND ERN TX ON FRIDAY AS SRN STREAM UPPER TROUGH EXPECTED TO DEVELOP
OVER MEXICO AND THE SRN RCKYS ON THURSDAY EDGES EWD. PROGRESSIVE
UPSTREAM PATTERN AND PHASING WITH NRN STREAM SPEED MAXIMA SHOULD
RESULT IN SOME AMPLIFICATION OF THE TROUGH AS IT CONTINUES SLOWLY
EWD EARLY SATURDAY.
AT LOWER LEVELS...DEEP/SUSTAINED SSWLY FLOW AND ANOTHER 60+ HOURS OF
GULF AIR MASS MODIFICATION SHOULD ALLOW RATHER WARM/MOIST AIR TO
OVERSPREAD THE SRN AND SE TX COASTAL PLAIN BY LATE FRIDAY/EARLY
SATURDAY. FRONTOGENETICAL FORCING SHOULD STRENGTHEN OVER REGION
DURING THE PERIOD AS /1/ A WEAK FRONT ASSOCIATED NRN STREAM JET
SETTLES S ACROSS N TX AND /2/ ELY ISALLOBARIC FLOW OUT OF LWR MS VLY
SURFACE RIDGE MAINTAINS SHALLOW COOL AIR OVER NE TX/LA.
...SRN/ERN TX...
COMBINATION OF INCREASING MOISTURE INFLOW /850 MB DEWPOINTS RISING
TO AOA 10C/ AND FAIRLY STEEP /7-8 DEG C PER KM/ MID LEVEL LAPSE
RATES ASSOCIATED WITH SW FLOW ALOFT LIKELY TO RESULT IN AT LEAST A
MODEST DEGREE OF INSTABILITY /MUCAPE TO 1000 J/KG/ OVER SRN AND ERN
TX ON FRIDAY . WHILE REGION WILL PROBABLY BE WEAKLY CAPPED...
PERSISTENCE OF LARGE SCALE ASCENT SUGGESTS THAT CAP WILL BE
BREACHED...ESPECIALLY ALONG BANDS OF MESOSCALE ASCENT ASSOCIATED
WITH DEVELOPING/INTENSIFYING FRONTAL ZONES EXPECTED TO FORM OVER
REGION DURING SECOND HALF OF PERIOD.
AMPLE /30 TO 40 KT/ DEEP WSWLY SHEAR WILL BE PRESENT TO SUPPORT
ORGANIZED CONVECTION AND SUPERCELLS IF STORMS DO INDEED FORM...AND
LOW LEVEL WINDS WILL LIKELY REMAIN BACKED TO A SELY COMPONENT OVER
PARTS OF CNTRL/SE TX AS A WARM FRONTAL SEGMENT TEMPORARILY DEVELOPS
ALONG THE CNTRL GULF CST. COUPLED WITH PERSISTENT NATURE OF FORCING
AND CONTINUED BOUNDARY LAYER MOISTURE INFLOW...IT APPEARS THAT AT
LEAST A LIMITED THREAT FOR SEVERE /HAIL AND ISOLATED TORNADOES/ WILL
EXIST...ESPECIALLY LATER FRIDAY THROUGH EARLY SATURDAY.