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November 27-29 severe threat


Buckeye05

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Euro is even drier than the GFS and with a slight positive tilt. Nothing good there. However I admit I'm hoping for some moisture return and a more GFS-like solution. Keep in mind everything had snow in the Mid South 24 hours ago, so yeah we might want to wait and see with these 700 mile track changes. Enjoy Thanksgiving first. Mild and fun!

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SPC has a D6 outlook, now that I checked.

DAY 4-8 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0359 AM CST WED NOV 21 2012

VALID 241200Z - 291200Z

...DISCUSSION...

PROGRESSIVE AND GENERALLY HIGH-AMPLITUDE PATTERN ALOFT IS FCST

THROUGH PERIOD. ORGANIZED SVR POTENTIAL WILL DEPEND ON SUBSTANTIAL

MOISTURE RETURN FROM WRN/CENTRAL GULF...WHICH IS NOT PROBABLE UNTIL

AT LEAST LATE DAY-5/25TH-26TH...AND MORE LIKELY DAY-6/26TH-27TH. BY

LATE DAY-5 AND EARLY DAY-6...OPEN-WAVE REMNANTS OF GULF OF AK

CYCLONE SHOULD BE MOVING SEWD OVER NRN/CENTRAL ROCKIES. MAIN

CONCERN NOW APPEARS TO BE MID-LATE DAY-6 OVER PORTIONS E TX AND

ARKLATEX REGION...PERHAPS MANIFEST AS

WELL-ORGANIZED...LOW-CAPE/STG-SHEAR NOCTURNAL EVENT.

SLGT DISAGREEMENT IS EVIDENT ON TIMING/AMPLITUDE OF DAY-6 UPPER WAVE

AND RELATED SFC FRONTAL ZONE AMONG ECMWF/SPECTRAL AND MOST MREF

MEMBERS. HOWEVER...PROGS GENERALLY CONCUR WITH JUXTAPOSITION OF

100+ KT 250-MB JET MAX...FAVORABLY STG DEEP SHEAR...HEIGHT FALLS

ALOFT...INCREASINGLY MOIST WARM SECTOR INTRUDED BY STG COLD

FRONT...AND PREFRONTAL DEW POINTS REACHING 60S F. SUCH SCENARIOS

TYPICALLY YIELD AOA 30% COOL-SEASON/TOTAL-SVR RESULTS. SIMILAR

POTENTIAL MAY CARRY OVER INTO DAY-7/27TH-28TH OVER PORTIONS

MID-SOUTH...TN VALLEY AND/OR CENTRAL GULF COAST STATES.

HOWEVER...PHASE UNCERTAINTIES IN KEY FEATURES -- BOTH SFC AND UPPER

AIR -- ARE LARGE ENOUGH TO PRECLUDE UNCONDITIONAL 30% AREA THEN.

..EDWARDS.. 11/21/2012

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