SWODY3
SPC AC 270745
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0245 AM CDT FRI APR 27 2007
VALID 291200Z - 301200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
MID/UPPER LEVEL RIDGING WILL EXTEND FROM THE WRN SECTIONS OF THE
LOWER MS VALLEY INTO THE MID MS VALLEY EFFECTIVELY TAKING THE MAIN
BAND OF THE WESTERLIES ACROSS THE NRN TIER OF STATES THEN SEWD OVER
THE LOWER GREAT LAKES AND THE NRN MID ATLANTIC REGION. MID/UPPER
LEVEL LOW OVER NWRN MEXICO DURING THE DAY 2 PERIOD WILL GRADUALLY
WEAKEN AND DRIFT ENEWD INTO EXTREME W TX/SRN PLATEAU REGION BY
30/12Z.
..AREAS OF W TX AND THE RIO GRANDE VALLEY...
FLOW OF LOW LEVEL MOISTURE IS PROJECTED TO BE NWD THRU THE ERN RANGE
OF THE MEXICAN MOUNTAINS/HIGH PLAINS INTO W TX SUNDAY. MODELS
INDICATE SUFFICIENT LOW LEVEL JET OF 30-40 KT EXTENDING NWD OVER THE
TX BIG BEND REGION COUPLED WITH A SWLY 50 KT MID LEVEL JET.
THUS...THERE WILL BE SUFFICIENT SHEAR TO SUPPORT THUNDERSTORMS...BUT
CONSIDERABLE CLOUD COVER IS EXPECTED TO LIMIT INSTABILITY WHERE
MUCAPES ARE PROGGED TO BE AROUND 500 J/KG. THUS...A FEW STRONG
THUNDERSTORMS COULD BE ASSOCIATED WITH THE WEAK MID/UPPER LOW...BUT
THESE STORMS ARE EXPECTED TO REMAIN BELOW SEVERE DUE TO THE LACK OF
SUFFICIENT INSTABILITY.
.MCCARTHY.. 04/27/2007
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