[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 200737
SWOMCD
SPC MCD 200736
TNZ000-KYZ000-GAZ000-ALZ000-200900-

MESOSCALE DISCUSSION 0393
NWS STORM PREDICTION CENTER NORMAN OK
0236 AM CDT MON APR 20 2015

AREAS AFFECTED...NORTHERN AL/FAR NORTHWEST GA/SOUTHEAST KY AND
MIDDLE/EASTERN TN

CONCERNING...SEVERE THUNDERSTORM WATCH 85...

VALID 200736Z - 200900Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 85
CONTINUES.

SUMMARY...POCKETS OF LOCALLY DAMAGING WINDS WILL REMAIN A CONCERN
OVERNIGHT ACROSS NORTHEAST AL/FAR NORTHWEST GA AND PORTIONS OF
MIDDLE/EASTERN TN...AND POSSIBLY FAR SOUTHEAST KY. SEVERE
THUNDERSTORM WATCH 85 CONTINUES UNTIL 12Z.

DISCUSSION...A FAST-MOVING SQUALL LINE CONTINUES TO PROGRESS
EAST/NORTHEASTWARD ACROSS NORTH-CENTRAL AL/MIDDLE TN AND
SOUTH-CENTRAL KY AS OF 0715Z...WITH A FORWARD MOTION AS FAST AS 50
KT ACROSS NORTHERN AL/SOUTHERN MIDDLE TN. CONSTANT ALTITUDE /CAPPI/
RADAR DATA SUGGESTS THAT THE STRONGEST UPDRAFTS PERSIST ACROSS
SOUTHERN MIDDLE TN AND NORTH-CENTRAL INTO NORTHEAST AL. RELATED TO
REAR-INFLOW/POSSIBLE MCV INFLUENCES...RECENT WSR-88D VWP DATA FROM
NASHVILLE/HUNTSVILLE ARE SAMPLING 50-60 KT SOUTH-SOUTHWESTERLY WINDS
WITHIN THE LOWEST 2-3 KM AGL IN THE IMMEDIATE WAKE OF THE CONVECTIVE
LINE. WITH PRE-SQUALL LINE SURFACE TEMPERATURES NOW GENERALLY BELOW
60 F...BOUNDARY-LAYER INHIBITION PRECEDING THE LINE WILL CONTINUE TO
STEADILY INCREASE AND GRADUALLY BECOME INCREASINGLY DETRIMENTAL FOR
SEVERE-CALIBER WIND GUSTS OVER THE NEXT FEW HOURS.
NONETHELESS...FACTORS SUCH AS THE ORGANIZATION/FAST FORWARD MOTION
OF THE CONVECTIVE LINE WILL CONTINUE TO RESULT IN LOCALIZED POCKETS
OF DAMAGING WINDS IN/NEAR SEVERE THUNDERSTORM WATCH 85.

..GUYER.. 04/20/2015

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

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

LAT...LON   36038617 36858566 37248413 36388380 34228496 33588683
            34698659 36038617



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