…Extremely critical fire weather conditions will continue across coastal
Southern California today…
…Much below average temperatures from the Midwest to the central
Appalachians through Wednesday but warming into the central U.S. on
Thursday…
…Locally heavy lake effect snow showers downwind of the Great Lakes
through Wednesday…
Overall, the weather pattern across most of the lower 48 through Thursday
will feature a lack of precipitation with a warming trend later in the
week. This will be a reflection of broad upper level troughing over the
eastern two thirds of the nation and ridging over the Pacific Northwest,
forecast to migrate eastward through Thursday.
Coastal southern California will continue to see extremely critical fire
weather conditions through at least today with localized wind gusts near
70 mph focused across Ventura and Los Angeles counties. Very dangerous
conditions will continue into Wednesday for many of these same locations
with a broader, though not as extreme, threat extending along most of the
Transverse and Peninsular Ranges. Winds are expected to oscillate in
magnitude over the next 48 hours but the environment is expected to be
remain extremely dangerous, favorable to very rapid fire growth if a fire
does start.
After the passage of a cold front on Monday night across the eastern U.S.,
another surge of modified Arctic air will move across the Midwest today.
High temperatures will be 10 to 20 degrees below average for many
locations from the Upper Midwest through the Ohio Valley today, with the
cold continuing for the Ohio Valley on Wednesday. A change in wind
direction from northerly/northwestelry to westerly will accompany a warm
front on Wednesday across the north-central U.S. which will have the
effect of significant warming for the region. In fact, high temperatures
are forecast to jump about 20 degrees higher on Wednesday compared to
Tuesday for the north-central U.S., moving high temperatures from below
average to above average. The warmer weather will expand south and east
for Thursday but the East Coast will still remain a little below average.
The other consequence of the cold weather will be heavy lake effect snow
showers on the southeast and eastern shores of the Great Lakes. While
local wind direction will vary over the next couple of days, moving narrow
bands of heavy snow north or south, the heaviest accumulations of 1 to 2
feet (locally higher) are expected east of Lake Erie and Lake Ontario,
especially into the Tug Hill Plateau.
Otto
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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