Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 271447
SWOMCD
SPC MCD 271447
ALZ000-MSZ000-LAZ000-271615-

MESOSCALE DISCUSSION 0481
NWS STORM PREDICTION CENTER NORMAN OK
0947 AM CDT MON APR 27 2015

AREAS AFFECTED...SE LA...SRN MS

CONCERNING...TORNADO WATCH 126...

VALID 271447Z - 271615Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 126 CONTINUES.

SUMMARY...A TORNADO AND WIND-DAMAGE THREAT SHOULD CONTINUE FOR
SEVERAL MORE HOURS BUT IS EXPECTED TO DIMINISH EARLY THIS AFTERNOON.
WW ISSUANCE IS NOT ANTICIPATED TO THE EAST OF WW 126 BUT A LOCAL
EXTENSION MAY BE NECESSARY ACROSS PARTS OF SRN MS AS THE BOW MOVES
OUT OF THE WATCH.

DISCUSSION...A FAST-MOVING BOWING LINE SEGMENT IN SE LA IS MOVING
EWD ALONG A FRONTAL BOUNDARY SITUATED FROM NEAR LAKE PONTCHARTRAIN
EWD TO JUST OFFSHORE FROM THE SRN MS AND SRN AL COASTS. THE GREATEST
INSTABILITY IS LOCATED OVER SE LA WHERE MESOANALYSIS SHOWS MLCAPE OF
1000 TO 1500 J/KG. AS THE LINE MOVES EWD...IT WILL ENCOUNTER WEAK
INSTABILITY ALONG THE COAST OF SRN MS AND TEND TO FAVOR THE STRONGER
INSTABILITY FURTHER OFFSHORE. FOR THIS REASON...THE LINE IS EXPECTED
TO CONTINUE TO TURN ESEWD. THIS STORM MOTION MAY ALLOW THE NRN END
OF THE LINE TO AFFECT THE COASTAL COUNTIES OF SRN MS OVER THE NEXT 2
TO 3 HOURS WHERE A LOCAL WW EXTENSION WILL PROBABLY BE NEEDED. DUE
TO LIMITED INSTABILITY ONSHORE ACROSS FAR SRN AL AND THE FL
PANHANDLE...NO WATCH IS ANTICIPATED TO THE EAST OF THE CURRENT
WATCH.

..BROYLES/MEAD.. 04/27/2015

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

ATTN...WFO...MOB...JAN...LIX...LCH...

LAT...LON   31649086 30699062 30089083 29449129 29119148 28849150
            28619093 28669000 29448867 30488835 31158868 31528958
            31649086



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