Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
355 AM EDT Wed Apr 08 2020

Valid Wed Apr 08 2020 - Fri Apr 10 2020

...Unsettled weather to continue across the Southwest with heavy mountain
snow, heavy valley and coastal rain, and the potential for flash flooding
over southern California...

...Severe weather and flash flooding possible for the Ohio Valley into
parts of the  Mid-Atlantic before a strong cold front clears the region on
Thursday...

...Significant snow possible for interior northern New England on
Thursday, plummeting temperatures arrive late week...

The anomalously deep upper-level low that has doused California with rain
and mountain snowfall the last few days will continue to slowly progress
through the Desert Southwest through week's end. A cold front ahead of the
deep upper low will inch its way towards the Lower Colorado River Valley
this morning. Pacific moisture streaming into southern California will
bring the threat of excessive rainfall into the region, which could lead
to flash flooding over the interior desert. In the higher elevations, more
than of foot of snow is expected most notably along the southern Sierra
Nevada. By Wednesday evening precipitation should edge farther east into
Arizona and southwestern Utah. The upper-low is forecast to weaken by
Thursday causing precipitation to become more widely scattered and taper
off across the Southwest, although a few spotty showers cannot be ruled
out.

Farther east, showers and thunderstorms will be common as a pair of
frontal systems traverse the eastern half of the country. As the episode
of severe weather in the eastern Ohio Valley finishes early this morning,
another frontal wave will once again raise the severe weather threat
farther south into the western Ohio Valley, central Mississippi Valley,
and Tennessee Valley on today before a strong cold front arrives from the
west Wednesday night. The Storm Prediction Center has both an Enhanced and
Slight Risks for severe weather in these regions for later today. The
strong front is forecast to sweep through the eastern U.S. on Thursday
with strong thunderstorms possible across the Mid-Atlantic states in the
morning hours. Meanwhile, a chance for showers and thunderstorms will be
present in the western Gulf Coast region Thursday evening.

As the strong cold front moves rapidly off the East Coast on Thursday, a
low pressure system is forecast to rapidly intensify near the New England
coast. In response to this rapid deepening, winds will pick up across New
England with accumulating snow likely to develop across the northern tier
of the region. Winter storm Watches have been issued for northern Maine as
snowfall accumulations over a foot are possible. When gusty winds are
paired with heavy snowfall, the potential exists for treacherous travel
and whiteout conditions. In addition, some lake-effect snow will likely
develop on Thursday downwind from the lower Great Lakes on the back side
of the low pressure system. Meanwhile, a cold Canadian air mass will race
across much of the eastern two-thirds of the country in wake of the strong
cold front. Temperatures in portions of the Central Plains could wake up
to temperatures near freezing come Friday morning.

Mullinax


Graphics available at:
NWS Weather Prediction Center Storm Prediction Center
United States 2 Day Forecast