SWOMCD
SPC MCD 300747
TXZ000-301045-
MESOSCALE DISCUSSION 0624
NWS STORM PREDICTION CENTER NORMAN OK
0247 AM CDT MON APR 30 2007
AREAS AFFECTED...PORTIONS S-CENTRAL/SW TX -- SRN HILL COUNTRY TO
NEARBY SECTIONS RIO GRANDE VALLEY.
CONCERNING...HEAVY RAINFALL
VALID 300747Z - 301045Z
BAND OF STG-SVR TSTMS IS EXPECTED TO CONTINUE POSING SVR RISK AS IT
MOVES EWD ACROSS THIS REGION...REF RELATED WW AND MESOSCALE
DISCUSSIONS FOR MORE GUIDANCE ON SVR POTENTIAL. MEANWHILE...INITIAL
BAND OF CONVECTION MAY CONTINUE PRODUCING 1-2 INCH/HOUR RAIN RATES
AS IT MOVES EWD ACROSS RUGGED TERRAIN OF SRN HILL COUNTRY AS WELL AS
ADJACENT PLAINS FARTHER S INVOF UVA/HDO.
ADDITIONAL DEVELOPMENT IS OCCURRING BEHIND MCS...ALONG RIO GRANDE IN
VAL VERDE AND TERRELL COUNTIES. OTHER TSTMS SHOULD FORM ATOP
OUTFLOW POOL...IN ZONE OF ELEVATED WAA AND ISENTROPIC LIFT TO
LFC...ASSOCIATED WITH 40-50 KT LLJ.
AIR MASS S AND E OF MCS IS CHARACTERIZED BY RICH MOIST LAYER WITH
AROUND 1.5 INCH PW READINGS FROM GPS DATA. 00Z DRT RAOB AND RUC
SOUNDINGS SUGGEST PW MAY REACH 1.75 INCH IN SOME AREAS...WITH MEAN
LOW LEVEL MIXING RATIOS AROUND 15 G/KG...850 MB DEW POINT ABOUT 15
C...AND SFC DEW POINTS NEAR 70 F AVAILABLE FOR ACTIVITY THAT SHOULD
REMAIN NEARLY SFC-BASED ANOTHER FEW HOURS. ADDITIONALLY...EXPECT
FAVORABLE STORM-RELATIVE LOW LEVEL INFLOW TO SUSTAIN EFFICIENT
PRECIP PRODUCTION.
.EDWARDS.. 04/30/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EWX...SJT...MAF...
29780188 30850074 31119897 30869779 29399911 29040063
29460106 29780146
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