[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 261658
SWOMCD
SPC MCD 261657
TNZ000-GAZ000-KYZ000-ALZ000-261830-

MESOSCALE DISCUSSION 2004
NWS STORM PREDICTION CENTER NORMAN OK
1157 AM CDT TUE OCT 26 2010

AREAS AFFECTED...NRN AL THROUGH MIDDLE TN

CONCERNING...TORNADO WATCH 723...

VALID 261657Z - 261830Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 723 CONTINUES.

GREATEST TORNADO THREAT INCLUDING POTENTIAL FOR STRONG TORNADOES IS
EXPECTED TO PERSIST FROM PORTIONS OF NRN AL INTO MIDDLE TN NEXT FEW
HOURS. AREAS DOWNSTREAM ACROSS PARTS OF ERN TN ARE ALSO BEING
MONITORED FOR AN INCREASING SEVERE THREAT.

GREATEST TORNADO THREAT NEXT FEW HOURS IS EXPECTED WITH DISCRETE
STORMS THAT HAVE DEVELOPED WITHIN PRE-FRONTAL WARM SECTOR FROM
MIDDLE TN INTO NWRN AL. DIABATIC WARMING OF THE BOUNDARY LAYER AS
WELL AS BAND OF ASCENT WITH WHAT APPEARS TO BE A SEWD PROPAGATING
GRAVITY WAVE APPEAR TO HAVE MODIFIED THE THERMODYNAMIC ENVIRONMENT
SUFFICIENTLY FOR STORMS TO DEEPEN AND INTENSIFY. STORMS ARE EMBEDDED
WITHIN AN ENVIRONMENT CHARACTERIZED BY A WARM AND MOIST BOUNDARY
LAYER...BUT WITH MODEST MID-LEVEL LAPSE RATES AND 500-1000 J/KG
MLCAPE. VERY LARGE HODOGRAPHS EXIST IN VICINITY OF THE LOW LEVEL JET
WITH 50+ KT EFFECTIVE SHEAR AND 200-300 M2/S2 STORM RELATIVE
HELICITY SUPPORTIVE OF SUPERCELLS AND LOW LEVEL MESOCYCLONES. THIS
CORRIDOR IS EXPECTED TO REMAIN ACTIVE NEXT FEW HOURS WITH A THREAT
FOR TORNADOES INCLUDING POTENTIAL FOR STRONG TORNADOES.

OTHER SHALLOW CONVECTION IS STARTING TO DEVELOP WITHIN PROGRESSIVE
ZONE OF ASCENT ACROSS ERN TN AND ALONG WHAT APPEARS TO BE A GRAVITY
WAVE. THIS AREA IS BEING MONITORED FOR A POSSIBLE WW.

..DIAL.. 10/26/2010

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MRX...FFC...LMK...OHX...BMX...HUN...

LAT...LON   33818795 35758745 36658584 36278397 34488574 33818795



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