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MESOSCALE DISCUSSION 0633
NWS STORM PREDICTION CENTER NORMAN OK
0334 PM CDT WED APR 29 2009
AREAS AFFECTED...PORTIONS OF NWRN TX
CONCERNING...TORNADO WATCH 210...
VALID 292034Z - 292130Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 210 CONTINUES.
AS OF 2030Z...BULK OF TSTM ACTIVITY HAD SHIFTED INTO ERN PORTIONS OF
WW 210 AND JOINED TRAILING PORTION OF LONG-LIVED MCS THAT HAS
TRAVERSED THE RED RIVER OVER THE PAST SEVERAL HOURS /SEE MCD 632 FOR
DISCUSSION DOWNSTREAM OF WW 210/. THE MOST INTENSE SUPERCELL
CENTERED OVER THROCKMORTON/YOUNG COUNTIES /WITH A HISTORY OF LARGE
HAIL REPORTED UP TO GOLF BALL SIZE/ APPEARS TO BE EVOLVING INTO A
BOW ECHO. GIVEN THE ORIENTATION OF THIS STORM AND WITH THE AIR MASS
CONTINUING TO DESTABILIZE AHEAD OF IT...AN ENHANCED DAMAGING WIND
THREAT SHOULD OCCUR OVER THE NEXT COUPLE OF HOURS. FARTHER
WEST...TSTM OUTFLOWS SURGING WWD /EVIDENT IN VISIBLE SATELLITE
IMAGERY/ HAVE APPEARED TO TEMPORARILY SUPPRESS ADDITIONAL TSTM
ACTIVITY. HOWEVER...COLLISION OF OUTFLOW BOUNDARIES WITH APPROACHING
DRYLINE MAY RESULT IN RENEWED TSTM DEVELOPMENT IN THE NEXT FEW HOURS
AND A RESURGENCE OF SEVERE POTENTIAL.
..GRAMS.. 04/29/2009
ATTN...WFO...FWD...OUN...SJT...LUB...MAF...
LAT...LON 32329770 32119996 32130168 32680218 33660202 33840014
34419932 33959749 32329770
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