Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
401 AM EDT Tue Aug 09 2022

Valid 12Z Tue Aug 09 2022 - 12Z Thu Aug 11 2022

...Heat to continue from the Northwest into the Plains, some relief by
Wednesday for the Northeast...

...Heavy Rain and Flash Flooding threat from the Ohio Valley into the
Central Appalachians...

...Monsoonal Showers to continue from the Southwest, portions of
California and into the Great Basin...

The prolonged heat streak will be winding down over the next couple of
days. Parts of the Interior Northwest and east across the Plains will have
daily temperatures ranging from the mid to upper 90s, which is above
seasonal average. Heat advisories and Excessive Heat Warnings are in
effect across eastern Washington, Oregon and northern Idaho. Cooler
temperatures will begin to filter into the Great Lakes and Northeast today
and continue through Wednesday as the cold front sinks southeastward
across the Northern Plains into the Upper Mississippi Valley and Upper
Lakes region. Much of the East will have another day of the heat before
temperatures start to moderate.

Showers and thunderstorms developing ahead of and along the leading cold
front will bring heavy rainfall and flash flooding from the Mississippi
Valley to the Central Appalachians; locations that have been very wet in
the past couple of weeks and have near soil saturation, lowered FFG and
elevated stream flows. Additional heavy rains across these areas may lead
to life-threatening flash flooding conditions.

Across the West very little change is expected through the end of the work
week. There will upper-level high pressures that will build across the
Rockies which will allow deep layered moisture to continue northward. This
above average moisture will help trigger widespread scattered monsoonal
showers and thunderstorms across these areas over the next few days. 
Isolated flash flooding is possible across these areas, especially over
burn scars, slot canyons, dry river beds or urban areas.

No changes expected also across the southeast quarter of the nation.  The
frontal boundary pressing into the Ohio Valley and Northeast will not make
any headway into the southeast quarter of the nation with humid conditions
prevailing.  Widespread showers and thunderstorms also possible with areas
of the Lower Mississippi Valley and Central Gulf Coast having the best
chances for heavy rains.  The clouds and rain across this area will also
keep high temperatures over the next few days slightly below average.

Campbell/Oravec

Graphics are available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php