…Excessive Rainfall and Severe Thunderstorms possible over portions of
the Great Plains and Mississippi Valley…
…Heavy to Excessive Rainfall possible across parts of the Northwest
through Monday…
…Increasing Excessive Heat threat over parts of California, Nevada and
Arizona…
A series of shortwaves will be responsible for Excessive Rainfall and
Severe Thunderstorms that develop across the Great Plains and Mississippi
Valley over the next few days. Today, showers and isolated thunderstorms
will spread from the High Plains into the Mississippi Valley. Some storms
may turn severe. The Storm Prediction Center issued an Enhanced Risk
(level 3/5) of Severe Thunderstorms across portions of the Central High
Plains this afternoon and evening. Very large hail, severe wind gusts
greater than 75 mph, and a few tornadoes are expected. Rain rates in some
of those storms could be high enough to cause flash flooding which is why
there’s a Slight Risk (at least 15%) of Excessive Rainfall over parts of
the Northern/Central Plains and Upper/Middle Mississippi Valley.
Elsewhere, a deep upper low will transport anomalous tropical Pacific
moisture into the Northwest today. Excessive Rainfall is naturally a
concern over the favorable terrain of the Cascades, Bitterrroots, Salmon
River Mountains as well as the Seattle metro, where Slight Risks (at least
15%) are in effect through Monday. Monday will be a Marginal Risk kind of
day for Excessive Rainfall and Severe Thunderstorms over parts of the
Southern/Central Plains and Mississippi Valley. Cloudy/cooler conditions
will prevail over the Northwest thanks to the Atmospheric River event set
to unfold over the next couple of days. Otherwise, the Great Plains and
Northeast are likely to experience above average temperatures this week.
Abnormal heat is expected to expand across parts of the West mid-week.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php