SWOMCD
SPC MCD 172350
LAZ000-TXZ000-180115-
MESOSCALE DISCUSSION 0505
NWS STORM PREDICTION CENTER NORMAN OK
0650 PM CDT FRI APR 17 2009
AREAS AFFECTED...LOWER SABINE RIVER VALLEY SWWD INTO THE LOWER TX
COAST
CONCERNING...TORNADO WATCH 162...
VALID 172350Z - 180115Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 162 CONTINUES.
THE POTENTIAL FOR ISOLATED SEVERE STORMS IS EXPECTED TO CONTINUE
ALONG THE COAST THROUGH AROUND 01Z. HAIL AND LOCALLY STRONG WIND
GUSTS WILL REMAIN THE PRIMARY SEVERE WEATHER THREATS.
AS OF 2330Z...REGIONAL RADAR IMAGERY INDICATED A LONG-LIVED MCS OVER
FAR SERN TX INTO SWRN LA WITH THE LEADING EDGE OF THE MOST INTENSE
CONVECTION FROM ORANGE COUNTY SWWD TO GALVESTON BAY. WHILE THE MCV
ATTENDANT TO PARENT SYSTEM IS TRANSLATING EWD...THE MORE INTENSE
CONVECTION ALONG LEADING EDGE OF THE COLD POOL IS MOVING/PROPAGATING
SEWD AT AROUND 20 KT. LOCALLY EXCESSIVE RAINFALL /HOURLY RATES OF
1-2 INCHES/ WILL BE THE PRIMARY HAZARD...THOUGH STRONG WIND GUSTS
REMAIN POSSIBLE.
ELSEWHERE...MORE ISOLATED STORMS EXHIBITING CONSIDERABLE DISCRETE
PROPAGATION WERE OBSERVED ALONG WRN EXTENSION OF MESOSCALE OUTFLOW
BOUNDARY OVER NUECES INTO DUVAL COUNTIES IN DEEP S TX. SOME
PERIODIC SUPERCELL CHARACTERISTIC HAVE BEEN OBSERVED WITH THIS
ACTIVITY AS IT PROGRESSES SEWD/SWD AT 10-20 KT. HAIL AND LOCALLY
STRONG WIND GUSTS WILL REMAIN POSSIBLE WITH THESE STORMS PRIOR TO
MOVING OFFSHORE AND/OR SLOWLY WEAKENING WITH THE DIURNAL COOLING OF
THE BOUNDARY LAYER LATER THIS EVENING.
..MEAD.. 04/17/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...CRP...EWX...BRO...
LAT...LON 27549889 28559786 29599654 30209533 30519426 30139370
29459396 28289595 27449712 27269774 27229834 27549889
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