SWOMCD
SPC MCD 292219
ARZ000-LAZ000-TXZ000-OKZ000-300015-
MESOSCALE DISCUSSION 0635
NWS STORM PREDICTION CENTER NORMAN OK
0519 PM CDT WED APR 29 2009
AREAS AFFECTED...N CNTRL/NERN TX...SWRN AR...NWRN LA
CONCERNING...HEAVY RAINFALL
VALID 292219Z - 300015Z
HEAVY RAINFALL WILL CONTINUE ACROSS MUCH OF NRN TX AND SWRN
AR...WHILE GRADUALLY BUILDING SEWD INTO NWRN LA. 1 TO 2 INCH AN HOUR
WITH ISOLD GREATER RATES CAN BE EXPECTED.
A LONG LIVED MCS...NOW ORIENTED IN SOMEWHAT OF A WAVY LINE ACROSS N
TX AND INTO SWRN AR...WILL VERY SLOWLY CONTINUE TO BUILD SWD/SEWD
TOWARDS MODERATE INSTABILITY. FAVORABLE MOISTURE INFLUX IN 30 TO 40
KT LOW LEVEL SLY WINDS AND WELL ABOVE NORMAL PWAT...NEARLY 200
PERCENT ABOVE CLIMATOLOGY...HAVE CONTRIBUTED TO VERY HEAVY RAINFALL
RATES. HOURLY PRECIPITATION ANALYSIS REFLECTS RATES OF GENERALLY 1
TO 2 INCH AN HOUR...WITH ISOLD 3 INCH AN HOUR RATES...WHILE RECENT
MESONET DATA HAVE MEASURED GREATER THAN 8 INCHES OF RAINFALL SINCE
MIDNIGHT NEAR THE CNTRL OK/TX BORDERS. MODEST MEAN FLOW ORIENTED
NEARLY PARALLEL TO THE LINGERING MCS WILL ALLOW TRAINING STORMS TO
CONTINUE ALONG THE BOUNDARY. MOVEMENT OF THE MCS WILL BE SLOW...WITH
PROPAGATION PRIMARILY BEING DOMINATED BY THE MODERATE INSTABILITY TO
THE S AND E.
..HURLBUT.. 04/29/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...FWD...OUN...
LAT...LON 32849668 32819862 33509876 33889744 33329542 33629475
34179409 34429356 33929303 33229298 32709345 32349430
32299555 32559624 32849668
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