SPC AC 270453
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1053 PM CST Sun Nov 26 2017
Valid 271200Z - 281200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Isolated thunderstorms will be possible across parts of the Great
Basin today. A couple thunderstorms may also occur through Monday
night over parts of the Florida Keys.
...Synopsis/Discussion...
A relatively progressive mid/upper pattern will continued across
western North America today, featuring a pair of impulses transiting
eastward. One of these will advance across southern Canada, while
the other will push from California to the Four Corners region
through the period. As it does so, an attendant surface front will
drop southeast across the Great Basin. Despite fairly low
tropospheric moisture content, ascent associated with both the
impulse and the front should be sufficient for convective activity,
primarily during the day across parts of Nevada and Utah. Forecast
soundings depict pockets of weak buoyancy, but through a suitable
depth for a few flashes of lightning.
Elsewhere, convection will likely approach the Florida Keys through
the period, aided by a weak impulse (currently observed over the
Gulf) rotating around the base of a longer-wave trough. Modest
low-level moistening, combined with gradual mid-level cooling, is
forecast to generate adequate surface-based buoyancy for showers and
a couple thunderstorms.
..Picca/Cook.. 11/27/2017
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