…Excessive Heat Warnings in effect across the California’s Central
Valley and much of the Desert Southwest…
…Severe Thunderstorms and Excessive Rainfall possible over portions of
the Central Plains and Middle Mississippi Valley on Friday…
An entrenched upper-level ridge with embedded shortwave energy will
continue to promote a heat wave throughout much of the West through the
end of the week. Widespread high and low temperature records are likely to
be tied or broken between California Nevada and Arizona today before the
heat wave expands north into Oregon and Washington on Friday and Saturday.
Highs in the 90s and 100s followed by lows ranging from the upper 50s to
mid 70s will represent 20-30 degree anomalies. HeatRisk will peak between
Major and Extreme today for much of the West, with California’s Central
Valley and the Desert Southwest being of particular concern due to their
lower elevations and some urban areas. Little to no overnight relief from
the heat will affect those without effective cooling and/or adequate
hydration.
Mid-level energy propagating through the Florida peninsula will support
warm southerly flow and a couple days of Major to Extreme Heat Risk,
particularly over urban parts of the state. Several high and low
temperature records may be tied or broken on Friday and Saturday.
Showers and thunderstorms will develop along a cold front moving across
the East Coast today. Locally heavy rainfall may occur over portions of
the Interior Northeast and southern New England this afternoon and
evening. Things mostly clear out across the East Coast on Friday, save for
parts of northern/central New England where some light showers and an
isolated thunderstorm will be possible.
We shift our attention to the Central U.S. on Friday as a low pressure
system emerges from the Rockies. Showers and thunderstorms are expected to
develop across the Central Plains and move into the Middle Mississippi
Valley as MCSs that day. The Storm Prediction Center issued a Slight Risk
(level 2/5) of Severe Thunderstorms across southwest/south-central
Nebraska and northwest/north-central Kansas due to the potential for hail
and damaging wind gusts associated with those MCSs. Excessive Rainfall
will be more of a concern once those storms move into a more unstable and
moist environment in the Lower Missouri Valley Friday evening. Thus, a
Slight Risk (at least 15%) of Excessive Rainfall leading to Flash Flooding
is in effect for much of eastern Kansas and parts of western Missouri.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
