The Nation’s Weather

…Dangerous heat expected in the Southwest Friday and Saturday…

…Excessive rainfall is constrained to the southern and eastern portions
of the country through Saturday…

The general flow pattern features a deepening upper level trough in the
East where temperatures will remain mild/become increasingly below average
for most areas, while ridging builds across the West and into the northern
Plains, bringing increasing heat/above average temperatures with time.
Record high temperatures will be threatened in and near northern
California on Friday and from California northward through portions of
Nevada, Oregon, Idaho, and western Montana on Saturday. The anticipated
heat in the Southwest on Friday and Saturday has led to the issuance of
Extreme Heat Warnings for the dangerous heat for portions of southernmost
Nevada, southeast California, and northwestern most Arizona. Drinking
plenty of water, wearing light colored clothing, and staying in air
conditioned areas is advised as temperatures soar as high as the mid 110s
Fahrenheit in lower desert locations like Death Valley, California.

Otherwise, waves of low pressure will move along a front, expected to push
southward through through Texas into northern Mexico and eastward from the
Southern Plains through the Mid-South, Southeast, and Mid-Atlantic States
as an increasingly dominant and very strong cyclone for late May
strengthens while moving from the Mid-Atlantic States through New England
Friday and Saturday. The excessive rainfall/flash flooding risk is
highest across the Southern Plains and Southeast Thursday evening/night,
from Kentucky across West Virginia and Maryland on Friday, and across
northern New England Saturday. The severe weather risk is expected to be
highest in and near northwest Texas Thursday evening, the Southeast
Thursday evening and Friday, and the Mid-Atlantic States on Saturday, with
a generally decreasing severe weather risk by the day.

Roth

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