The Nation’s Weather

…Record breaking heat continues over the Southwest U.S….

…Critical fire weather risk over the Northern/Central High Plains today
and tomorrow…

…Generally dry conditions across much of the Lower 48 through midweek…

Approximately 35 million people in the Southwest U.S. fall within a heat
alert today as a late-season heat wave keeps a firm grip over the region.
Continuing the trend from the last several days, numerous record breaking
high temperatures in the triple digits are expected through at least this
Friday, which will support widespread Moderate to Major heat impacts
across the San Francisco, Las Vegas, and Los Angeles metropolitan areas
per the most recent experimental HeatRisk runs. Locally Extreme heat
impacts are also expected atop the Phoenix metropolitan area today. As a
reminder, the Major to Extreme HeatRisk categories mean that health
impacts from heat become more likely in general, and may occur in anyone
without adequate hydration or cooling.

Outside of the Southwest, well-above average temperatures are expected
through midweek across much of Intermountain West and Plains states within
the warm sector of a developing surface low in the Canadian prairies.
While temperatures will not reach the hazardous levels of the Southwest,
the warmth combined with strengthening surface winds and dry conditions
will support Critical fire weather conditions over the Northern/Central
High Plains today and tomorrow, respectively. Widespread Red Flag Warnings
are in effect across much of the aforementioned area as of this afternoon.

Precipitation-wise, lingering moderate to locally heavy rainfall over the
Mid-Atlantic and central Florida should clear out tonight as approaching
high-pressure kicks a pesky offshore low to the east. A second batch of
showers may arrive to the Eastern U.S. associated with a cold front
tomorrow, but rainfall amounts should be modest at best. Otherwise, a weak
front in the Gulf of Mexico could support locally heavy rainfall along the
Gulf Coast later tomorrow, although much of the heaviest rainfall is
forecast to remain offshore.

Asherman

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