SPC AC 080543
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1143 PM CST Wed Mar 07 2018
Valid 081200Z - 091200Z
...NO THUNDERSTORM AREAS FORECAST...
The risk for thunderstorms appears low across the country today.
As a series of shortwave troughs advance cyclonically around its
periphery, a large closed mid/upper low will slowly progress from
the Great Lakes towards New England through the period. Related to
this evolution, a broad trough across the eastern half of the US
will favor offshore/continental low-level trajectories today, with
only initial/weak moisture return occurring over southern Texas late
Thursday night. Therefore, stable conditions should preclude
thunderstorm development east of the Rockies.
Farther west, an impulse will de-amplify as it translates eastward
from the Pacific Northwest to the northern Rockies today. Cooling
mid levels (e.g., 500mb temps around -25 C) may yield weak buoyancy
from far eastern Oregon/Washington to the Idaho/Montana border by
afternoon, and an isolated strike or two may occur. However,
weakening large-scale ascent and a lack of deeper/more substantive
instability are forecast to temper overall convective activity.
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