Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
358 AM EDT Wed Jun 07 2023

Valid 12Z Wed Jun 07 2023 - 12Z Fri Jun 09 2023

...There is a Slight Risk of excessive rainfall over parts of the
Central/Southern Rockies/High Plains into the Northern Rockies on
Wednesday and over parts of the Northern Intermountain Region/Northern
Rockies on Thursday...

...Air Quality Alerts over parts of the Upper Great Lakes to the
Northeast...

Upper-level impulses and moisture trapped under an upper-level ridge from
the North Intermountain Region to the Upper Mississippi Valley and
southward to the South Rockies to the Central Gulf Coast will produce
showers and thunderstorms through Friday. Some of the showers and
thunderstorms will create heavy rain over parts of Northeastern New
Mexico, the Texas Panhandle, and Colorado on Wednesday. Therefore, the WPC
has issued a Slight Risk of excessive rainfall over parts of the Southern
Rockies, Southern High Plains, and Central Rockies on Wednesday into
Thursday morning. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, and small streams the
most vulnerable.

Another area of heavy rain will develop over parts of Montana and Wyoming,
also on Wednesday. Therefore, the WPC has issued a Slight Risk of
excessive rainfall over parts of the Northern Rockies on Wednesday into
Thursday morning. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, and small streams the
most vulnerable.

On Thursday, the threat of excessive rainfall ends over the Southern
Rockies, Southern High Plains, and Central Rockies. However, the threat of
excessive rainfall continues over parts of Idaho, Montana, and Wyoming.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over
parts of the Northern Intermountain Region/Northern Rockies from Thursday
into Friday morning. The associated heavy rain will create mainly
localized areas of flash flooding, with urban areas, roads, and small
streams the most vulnerable.

Moreover, an upper-level low over Southern California will slowly move
inland to the Great Basin while weakening through Friday. As a result, the
system will produce showers and thunderstorms over parts of the state and
the Pacific Northwest/Great Basin through Friday. Additionally, a weak
front moving from the Mid-Atlantic, Ohio Valley, and Middle Mississippi
Valley southward to the Southeast to the Central Gulf Coast, Lower
Mississippi Valley, and Central/Southern Plains by Friday. Showers and
thunderstorms will develop along and ahead of the boundary on Wednesday
into Friday morning.

Meanwhile, an upper-level low over New England continues over the region
through Friday. On Wednesday, rain and drizzle will develop over parts of
the Northeast through Friday.

Wildfire smoke moving southward out of Canada and over the northern part
of the country has triggered Air Quality Alerts over parts of the
Northeast into the southern Mid-Atlantic.


Ziegenfelder


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