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Texas, Karnes

Special Statement

Statement as of 11:42 AM CDT on May 21, 2013

Expires 1:00 PM EDT on May 21, 2013


... Extremely unstable airmass poised to erupt in severe thunderstorms
with large hail and damaging winds by late afternoon through this
evening...

Rich low level Gulf moisture coupled with daytime heating and
cold air aloft will result in an extremely unstable air mass
across south central Texas from late this morning through early
evening. Thunderstorm development is expected beginning by early
this afternoon as an an upper level trough and cold front approach
from the west. Scattered thunderstorms will develop rapidly by
late afternoon... quickly becoming severe as the front encounters
this unstable air mass. The main threats will be from large hail
and damaging thunderstorm winds... however with the extreme
instability present... isolated tornadoes cannot be ruled out. Much
of the eastern half of south central Texas... mainly east of a
Kerrville to Carrizo Springs line... will be affected from late
afternoon until the early morning hours Wednesday. In
addition... rainfall amounts may average 1 to 3 inches within the
heaviest storms producing some localized flooding.

Heightened concern exists along and north of a Burnet to Austin to
Giddings line this evening... where the most unstable conditions will
reside. This area will be most at risk for very large hail and
isolated tornadoes.

The weather system should exit the region by early Wednesday
morning... with heavy rains and severe weather concerns moving east
of the region.

Listen to NOAA Weather Radio or your local media for later updates
on this severe weather event. Also... go to weather.Gov/Austin for
the latest information... forecasts and warnings.


454 am CDT Tue may 21 2013

... Extremely unstable airmass poised to erupt in severe thunderstorms
with large hail and damaging winds by late afternoon through this
evening...

Rich low level Gulf moisture coupled with steep lapse rates aloft
have resulted in an extremely unstable air-mass across south
central Texas early this morning. An upper level trough pushing
east over central Texas will slide a cold front into western
portions of south central Texas this afternoon. Scattered
thunderstorms will develop rapidly by late afternoon... quickly
becoming severe as the front encounters this unstable air mass.
The main threats will be from large hail and damaging thunderstorm
winds... however with the extreme instability present... isolated
tornadoes cannot be ruled out. Much of the eastern half of south
central Texas will be affected from late afternoon until the early
morning hours Wednesday. In addition... rainfall amounts may
average 1 to 3 inches within the heaviest storms producing some
localized flooding.

Heightened concern exists across the northeast corridor this
evening... including the cities of Burnet... Georgetown... Austin and
Giddings. Erosion of the capping inversion coupled with extreme
instability along the front and an increasing low level jet... may
lead to very large hail and isolated tornadoes.

The system should exit the region overnight tonight... early
Wednesday morning... with rains and severe weather ending from the
west.

Listen to NOAA Weather Radio or your local media for later updates
on this severe weather event. Also... go to weather.Gov/Austin for
the latest information... forecasts and warnings.


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Arkansas - Flood Warning , Flash Flood Warning , Flood Advisory, Flash Flood Watch , Flood Advisory , Flash Flood Watch
California - High Surf Advisory , Wind Advisory , Lake Wind Advisory , Freeze Warning , Freeze Watch , Special Statement , Public Information Statement
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