18Z UPDATE
SURFACE ANALYSIS
CONUS: http://i39.tinypic.com/2qdwhap.jpg
CENTRAL PLAINS: http://i43.tinypic.com/2qmja8m.jpg
SOUTHERN PLAINS: http://i41.tinypic.com/20uplqf.jpg
UPPER MIDWEST: http://i44.tinypic.com/vym6ht.jpg
MID MISSISSIPPI: http://i44.tinypic.com/vym6ht.jpg
WIND PROFILER: http://i44.tinypic.com/2eowbhi.jpg
VISIBLE SATELLITE
MIDWEST: http://i40.tinypic.com/20pav11.jpg
UPPER MIDWEST: http://i44.tinypic.com/6sumiv.jpg
SOUTHERN PLAINS: http://i43.tinypic.com/vewzcy.jpg
MID MISSISSIPPI: http://i43.tinypic.com/10git6b.jpg
RADAR COMPOSITE
NATIONAL: http://i42.tinypic.com/xkqej5.jpg
MIDWEST: http://i40.tinypic.com/2e187jm.jpg
SOUTHERN PLAINS: http://i44.tinypic.com/257nh4k.jpg
UPPER MIDWEST: http://i39.tinypic.com/2s8hclw.jpg
MID MISSISSIPPI: http://i43.tinypic.com/2n9dv1l.jpg
UPPER MISSISSIPPI: http://i39.tinypic.com/hu3jic.jpg
18Z AVAILABLE SOUNDINGS
DODGE CITY: http://i43.tinypic.com/12364jk.jpg
NORTH PLATTE: http://i42.tinypic.com/1418jp.jpg
AMARILLO: http://i44.tinypic.com/k1cqat.jpg
MESOSCALE DISCUSSIONS
MD#1: http://i43.tinypic.com/33le2j8.gif
MESOSCALE DISCUSSION
NWS STORM PREDICTION CENTER NORMAN OK
1151 AM CDT
AREAS AFFECTED...CNTRL THROUGH W CNTRL AND SW OK
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID
STORMS ARE EXPECTED TO INCREASE IN INTENSITY NEXT FEW HOURS OVER
CNTRL OK...WITH SOME POTENTIAL FOR WWD AND SWWD DEVELOPMENT INTO WRN
OK. SOME SUPERCELL STRUCTURES WILL BE POSSIBLE WITH LARGE HAIL THE
MAIN THREAT. VERY HEAVY RAIN IS ALSO LIKELY GIVEN THE EXPECTED SLOW
STORM MOTIONS. AREA IS BEING MONITORED FOR A POSSIBLE WW.
LATE THIS MORNING AN OUTFLOW BOUNDARY EXTENDS FROM NWRN AR JUST N OF
FORT SMITH WNWWD THROUGH CNTRL OK NEAR OKLAHOMA CITY THEN NWWD TO
NEAR GAGE. DESTABILIZATION WILL CONTINUE IN THE WARM SECTOR S OF
THIS BOUNDARY ACROSS SRN THROUGH WRN OK AS LOW CLOUDS MIX OUT. RICH
LOW LEVEL MOISTURE...STEEP MID LEVEL LAPSE RATES AND SURFACE HEATING
WILL SUPPORT MLCAPE FROM 3000 TO 4000 J/KG. THE SLY LOW LEVEL JET
SHOULD WEAKEN DURING THE DAY. HOWEVER...15 TO 20 KT SLY FLOW
IMPINGING ON THE BOUNDARY SHOULD BE SUFFICIENT TO SUPPORT CONTINUED
STORM DEVELOPMENT ALONG AND N OF THE BOUNDARY AS THE CAP WEAKENS.
BACKED LOW LEVEL FLOW IMMEDIATELY N OF THE BOUNDARY IS CONTRIBUTING
VERTICAL SHEAR FOR SUPERCELLS. HOWEVER...MID LEVEL FLOW IS
RELATIVELY WEAK. IF ENOUGH STORMS DEVELOP TO ORGANIZE A COLD
POOL...SOME SLOW SWWD DEVELOPMENT MAY BE POSSIBLE THIS AFTERNOON.
GIVEN THE DEGREE OF INSTABILITY AND POTENTIAL FOR SUPERCELL
STRUCTURES...VERY LARGE HAIL WILL BE POSSIBLE...ESPECIALLY ONCE
STORMS BECOME SURFACE BASED.
MD#2: http://i42.tinypic.com/210jcdi.gif
MESOSCALE DISCUSSION
NWS STORM PREDICTION CENTER NORMAN OK
1215 PM CDT
AREAS AFFECTED...MUCH OF NRN/CENTRAL NY...VT/NH AND WRN ME
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
TSTMS DEVELOPING OVER THE AREA POSES A THREAT FOR ISOLATED LARGE
HAIL/DAMAGING WINDS IN THE NEXT FEW HOURS. OVERALL RISK APPEARS TO
BE MARGINAL ENOUGH THAT A WW MAY BE ANTICIPATED ATTM.
FCST SOUNDINGS AND OBJECTIVE ANALYSIS OVER THE AREA SUGGESTS THAT
MUCAPES WERE FROM 2000-3000 J/KG OVER THE REGION. TSTMS HAVE
RECENTLY DEVELOPED ALONG A E-W ORIENTED BOUNDARY EXTENDING FROM ERN
ONTARIO EWD ACROSS NRN NY...NRN VT/NRN NH INTO SWRN ME. AN UPPER
WAVE EVIDENT ON WV IMAGERY OVER ERN ONTARIO WILL CONTINUE TO MOVE
EWD OVER THE RIDGE AND ACROSS NRN NEW ENGLAND THIS AFTERNOON. THIS
FEATURE SHOULD SUPPORT ADDITIONAL TSTM DEVELOPMENT OVER THE
REGION...ESPECIALLY ALONG AFOREMENTIONED E-W ORIENTED BOUNDARY. MID
LEVEL FLOW WILL REMAIN RELATIVELY WEAK /AOB 30 KTS/ THUS...GIVEN
VEERED LOW LEVEL FLOW...OVERALL DEEP LAYER SHEAR WILL BE SUPPORTIVE
OF MOSTLY MULTICELLULAR TYPE STORM STRUCTURES. HOWEVER...GIVEN THE
AMT OF INSTABILITY OVER THE AREA...BRIEF SUPERCELLULAR TYPE
STRUCTURES MAY BE POSSIBLE WITH AN ISOLATED LARGE HAIL THREAT.
UNIDIRECTIONAL SHEAR PROFILES FURTHER SUPPORT CONVECTION EVENTUALLY
BECOMING LINEAR WITH THE POTENTIAL FOR ISOLATED DAMAGING WINDS.
CONVECTION SHOULD MOVE ESEWD AROUND 20 KTS...WITH SLIGHTLY FASTER
MOTIONS WITHIN INDIVIDUAL LINE SEGMENTS.
THIS IS THE LAST FULL UPDATE TODAY. THERE WILL BE A FEW SUPPLEMENTAL UPDATES PRIOR TO THE FULL 21Z UPDATE TOMORROW.