National Weather Service
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Severe Storm Outlook Narrative (AC)
acus01 kwns 230103
spc ac 230100
day 1 convective outlook
nws storm prediction center norman ok
0800 pm cdt wed may 22 2013
valid 230100z - 231200z
... there is a slgt risk of svr tstms from the mid atlantic into a
portion of the nern states...
... mid atlantic through the nern states...
isolated storms with at least marginal supercell structures are
moving ewd through ncntrl ny. additional storms developing over lake
ontario will eventually move into nrn ny. vertical shear in this
region is a bit stronger than farther south with 30 - 40 kt effective
shear ... and the llj is forecast to strengthen during the evening.
threat for isolated large hail and damaging wind will persist
through at least mid evening. also an isolated tornado cannot be
ruled out next hour or two.
farther south a broken line of multicell storms extends from ern pa
swd through wrn va and wrn nc. this activity may continue to pose a
threat for isolated damaging wind and large hail through mid
evening ... but a gradual decrease is expected to begin by 02z as the
boundary layer begins to cool.
... oh valley...
widely scattered mostly multicell storms persist across the oh
valley swd into the tn valley within modest broad cyclonic flow
regime. a convective outflow boundary was also observed from sern ky
through wrn wv ... moving wwd. some of the storms may briefly attain
severe levels next couple hours as they interact and merge with the
preexisting outflow boundaries. overall coverage of any severe
reports in this region is expected to remain sparse and the activity
will undergo a gradual decrease as instability diminishes with onset
of nocturnal cooling.
.. dial.. 05/23/2013