Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1121 AM CDT Sun Aug 18 2024
Valid 181630Z - 191200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING ALONG AN AXIS FROM EASTERN KANSAS INTO
ARKANSAS/MISSISSIPPI...THEN EXTENDING ACROSS THE SOUTHEAST STATES
INTO THE CAROLINAS AND MID ATLANTIC REGION....
...SUMMARY...
Clusters of severe thunderstorms with strong/damaging winds are
possible today along an axis from eastern Kansas into
Arkansas/Mississippi, then extending across the southeast states
into the Carolinas and Mid Atlantic region.
...Eastern States...
A broad upper trough persists over the eastern US today, with the
main baroclinic zone extending from eastern NY/PA southward into the
Mid Atlantic region and western Carolinas. Pockets of strong
heating and a very moist surface air mass will result in widespread
moderate CAPE values ahead of the front this afternoon, where
scattered thunderstorms are forecast to develop. Cyclonic flow
aloft around the upper trough will be sufficient to help organize
storms into multicell clusters capable of damaging wind gusts and
some hail. This activity will slowly move eastward through the
early evening with a continued severe threat.
...Southern States...
Clear skies are present today across the southern tier of states,
with dewpoints in the mid 70s yielding afternoon CAPE of 2500+ J/kg.
Widely scattered thunderstorms will develop by mid-late afternoon
along the western extent of the aforementioned baroclinic zone that
will stretch from central GA/AL/MS then northwestward across AR.
Moderately strong mid-level winds, and considerable dry air aloft
will help to promote downburst winds in the strongest cores
throughout this corridor.
...Eastern KS...
A nocturnal MCS persists this morning over southeast NE. Most 12z
CAM guidance suggests this cluster of storms diminishes, however
given the mesoscale organization of the MCS, it could persist
through the morning diurnal min. If that scenario occurs,
conditions favor a potentially damaging wind event across parts of
eastern KS through the afternoon and evening.
...UT/ID/MT...
Several weak mid-level shortwave troughs are evident this morning
across the northern Great Basin. These features and associated
pockets of mid-level moisture will aid in the development of
scattered thunderstorm development from southern UT northward into
the mountains of western MT. Favorably strong southerly winds aloft
will support a risk of gusty/damaging wind in the strongest cells.
..Hart/Thornton.. 08/18/2024
Read more CHECK UPDATE ZOOM GRAPHIC
http://dlvr.it/TC4Jpy
