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Message Subject 989 mb Explosively Developing Low over Chicago early Wed!!! TWO DEATHS CONFIRMED!!!! Compared with cleveland superbomb
Poster Handle Luisport
Post Content
SPC AC 291620

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1020 AM CST TUE JAN 29 2013

VALID 291630Z - 301200Z

...THERE IS A MDT RISK OF SVR TSTMS FROM THE ARKLATEX TO THE LOWER
OH VALLEY...

...THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE MDT RISK...FROM
ERN TX/OK TO THE LOWER MS VALLEY AND OH VALLEY...

...ERN OK/TX TO THE MS AND OH VALLEYS THROUGH TONIGHT...
A LARGE-SCALE MID-UPPER TROUGH OVER THE HIGH PLAINS WILL PROGRESS
EWD OVER THE LOWER PLAINS TO THE MS VALLEY BY EARLY WEDNESDAY.
WITHIN THE LARGE TROUGH...A PRIMARY SHORTWAVE TROUGH OVER THE SRN
HIGH PLAINS...WITH AN ASSOCIATED 100 KT MIDLEVEL JET...WILL EJECT
ENEWD TOWARD ERN OK/NW AR/MO OVERNIGHT. LIKEWISE...AN ASSOCIATED
SURFACE CYCLONE NOW IN N CENTRAL OK WILL DEEPEN AND MOVE NEWD ACROSS
MO/IL TO LOWER MI...ALONG A PRE-EXISTING BAROCLINIC ZONE.
MEANWHILE...A BROAD MOIST SECTOR IS ALREADY ESTABLISHED FROM ERN
TX/OK TO THE LOWER AND MID MS VALLEY REGION...WHERE BOUNDARY LAYER
DEWPOINTS RANGE FROM THE UPPER 60S ALONG THE NW GULF COAST...TO
56-60 F FARTHER N INTO MO/IL. ADDITIONAL EWD EXPANSION OF THE MOIST
SECTOR IS LIKELY THROUGH TONIGHT ACROSS THE MS/TN AND LOWER OH
VALLEY REGION...IN RESPONSE TO THE DEEPEN CYCLONE AND A
STRENGTHENING SLY LLJ.

WIDESPREAD CONVECTION IS ONGOING ALONG AND JUST AHEAD OF THE SURFACE
COLD FRONT FROM CENTRAL OK TO NRN MO. THOUGH EXTENSIVE CLOUDS ARE
PRESENT THROUGH MUCH OF THE WARM SECTOR...CONTINUED MOISTURE
ADVECTION FROM THE S AND MODEST SURFACE HEATING IN CLOUD BREAKS WILL
BOOST MLCAPE VALUES TO THE 1000-2000 J/KG RANGE ACROSS E TX AND SE
OK THIS AFTERNOON...WITH LESSER BUOYANCY FARTHER TO THE E AND NE.
THERE ARE ALREADY INDICATIONS THAT ADDITIONAL PRE-FRONTAL CONVECTION
WILL DEVELOP FROM NE TX INTO SE OK/WRN AR AND EVENTUALLY SRN MO THIS
AFTERNOON ALONG THE MOIST AXIS. VERTICAL SHEAR PROFILES WILL BE
FAVORABLE FOR SUPERCELLS WITH AN ATTENDANT RISK FOR TORNADOES AND
DAMAGING WINDS ACROSS THIS CORRIDOR. FARTHER N...CONVECTION WILL
GRADUALLY EVOLVE INTO A WELL-DEVELOPED QLCS WITH AN INCREASING RISK
FOR DAMAGING WINDS LATER THIS AFTERNOON INTO EARLY TONIGHT...WITH A
RISK OF EMBEDDED MESOVORTICES AND TORNADOES.

THE GREATEST SEVERE RISK IS EXPECTED THIS EVENING THROUGH
TONIGHT...BEGINNING AS THE PRE-FRONTAL CONVECTION NEAR AND NW OF THE
ARKLATEX...AND CONTINUING OVERNIGHT AS ADDITIONAL PRE-FRONTAL
CONVECTION FORMS WITHIN ONE OR MORE WARM SECTOR CONFLUENCE BANDS
NEAR THE MS RIVER. VERTICAL SHEAR WILL BE EXTREMELY STRONG WITHIN A
MOIST ENVIRONMENT WITH AT LEAST WEAK SURFACE-BASED INSTABILITY.
THOUGH MLCAPE MAY ONLY REACH 500-750 J/KG...EFFECTIVE SRH OF 500-700
M2/S2 IN ASSOCIATION WITH A 70-80 KT LLJ WILL SUPPORT THE POTENTIAL
FOR A FEW STRONG TORNADOES WITH FAST-MOVING PRE-FRONTAL
SUPERCELLS...AS WELL AS CIRCULATIONS EMBEDDED WITHIN WHAT WILL
BECOME A WELL-FORMED SQUALL LINE. WIDESPREAD AND SIGNIFICANT
DAMAGING WINDS WILL ALSO BE POSSIBLE AS FAR NE AS THE LOWER OH
VALLEY...WHERE 80+ KT FLOW JUST ABOVE THE SURFACE WILL COINCIDE WITH
AT LEAST WEAK SURFACE-BASED BUOYANCY THROUGH MOST OF THE NIGHT.

..THOMPSON/COHEN.. 01/29/2013

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