- Day Three
acus03 kwns 260722
Storm Prediction Center ac 260721
Day 3 convective outlook
National Weather Service Storm Prediction Center Norman OK
0221 am CDT Tue Sep 26 2017
Valid 281200z - 291200z
..no severe thunderstorm areas forecast...
severe thunderstorms are not expected across the U.S. On Thursday.
Northern-stream upper troughing is progged to persist across eastern
Canada and the Great Lakes/northeast Thursday, shifting gradually
eastward/southeastward with time. Meanwhile farther west, troughing
over The Rockies -- drifting slowly northeastward -- is expected to
weaken with time while ridging persists over the south-central
states through the period.
At the surface, a cold front -- shifting off the New England and
mid-Atlantic coasts at the start of the period, will progress
southeastward across the southern states, leaving a large area of
high pressure in its wake to cover the majority of the U.S. By the
end of the period.
Along with potential for showers and a few thunderstorms ahead of
the slowly advancing southern/eastern U.S. Cold front, afternoon
showers and isolated thunderstorms are also expected across portions
of The Four Corners states and vicinity near the weakening upper
low/trough. Finally, showers -- and perhaps a few thunderstorms --
are expected over the upper Great Lakes region, mainly during the
second half of the period. In all areas, risk for severe storms
appears to be minimal.