…Dangerous heat continues to impact portions of southern California and
the Southwest through Monday…
…Heavy rain and scattered instances of flash flooding remain possible
along the Gulf Coast and parts of the Southeast over the next several
days…
…Below average temperatures forecast across much of the Midwest and East
through the beginning of the week…
Potentially dangerous and record-breaking heat is forecast to continue
across southern California as highs soar into the upper 90s and triple
digits away from the immediate coastline. Excessive Heat Warnings remain
in effect through Monday as a gradual cooldown commences on Tuesday. Highs
into the triple digits are also forecast throughout the remainder of the
Desert Southwest, but not considered as anomalous as values forecast
across southern California. Elsewhere, above average temperatures are
anticipated across the northern Great Basin and northern Plains as
upper-level ridging slides eastward. Heat will wane across eastern
Washington and neighboring states by Tuesday as the core of the
late-summer temperatures concentrate over the northern Plains. Highs in
the north-central U.S. are forecast to reach into the low-to-mid 90s early
this week, which equates to around 10 to 20 degrees above average for this
time of year. Additionally, sultry heat and humidity will impact southern
Florida once again today, where Heat Advisories have been issued due to
maximum heat indices forecast to near 110 degrees. Remember to follow
proper heat safety by staying hydrated, limiting strenuous outdoor
activity during peak daytime heating, and checking on vulnerable
individuals.
Much of the Nation is anticipated to be void of notable precipitation over
the next few days, with the Gulf Coast and parts of the Southeast being
the lone exception. A lingering stationary front and developing area of
low pressure in the western Gulf of Mexico will focus heavy rainfall
potential from the coastal Carolinas to the Florida Peninsula and entire
Gulf Coast region. Scattered flash flooding is possible where the heaviest
rainfall occurs, with urban and low-lying areas most at risk to flooding
impacts. Otherwise, isolated flash flooding is also possible in parts of
the Intermountain West through early this week due to widely scattered
thunderstorms developing in tandem with daytime heating.
Large surface high pressure extending from the southern Plains to the
Midwest and East throughout Tuesday will not only supply sunny and dry
conditions for much of the Lower 48, but well below average temperatures
as well. In fact, daily record lows are possible between the Midwest and
Mid-Atlantic this morning as temperatures dip into the 40s for most
locations. Patchy frost is possible in low lying protected areas. As this
autumnal airmass moderates somewhat early this week, afternoon
temperatures will gradually warm back into the mid-80s by Tuesday.
Snell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
