…Dangerous heat continues to impact portions of the West this weekend…
…Heavy rain and scattered instances of flash flooding are possible along
the Gulf Coast and parts of the Southeast…
…Below average temperatures to settle in across much of the Midwest and
East through the beginning of next week…
A few more days of record-breaking and dangerous heat are in store for
parts of the West as well above average temperatures linger underneath a
weakening upper-level high pressure system. Areas most likely to
experience major to extreme HeatRisk (levels of heat that affect anyone
without effective cooling or adequate hydration) through Sunday include
southern California, the Desert Southwest, and the northern Great Basin.
These regions are also where Excessive Heat Warnings and Heat Advisories
remain in effect. High temperatures in the Southwest are expected to soar
into the upper 90s and triple digits, with 110s in the typically hottest
desert locations through at least Monday. Highs into the upper 90s are
forecast to simmer the northern Great Basin before a gradual cooling trend
commences by early next week, with the anomalously warm temperatures
forecast to shift eastward into the northern Plains. Residents and
visitors are advised to continue following proper heat safety. This
includes staying hydrated and avoiding extended periods of time outdoors
during the hottest parts of the day. Poor air quality will also remain a
concern for parts of the Great Basin as wildfire smoke continues to
overspread the region.
A stationary front extending from off the Southeast coastline to the
northern Gulf of Mexico will continue to provide a focus for numerous
showers and thunderstorms over the next few days as its moisture gradient
gets reinforced by a separate approaching cold front sinking southward
across the Deep South today. Areas of locally heavy rain and scattered
flash floods are possible from the coastal Carolinas to the central Gulf
Coast, including northern and central Florida. Greater concentration of
tropical downpours are anticipated to reorient to southern Texas by Monday
as an area of low pressure develops in the Bay of Campeche and ushers
elevated atmospheric moisture westward to the western Gulf Coast.
Elsewhere, a cold front sweeping across the East Coast today will produce
scattered showers and thunderstorms throughout the Northeast. Behind this
frontal boundary and underneath potent high pressure, below average and
crisp temperatures are expected to overspread much of the Great Lakes,
Midwest, and East this weekend. Widespread lows into the 40s will lead to
a few chilly mornings, with several daily record lows possible between
Missouri and New Jersey on Sunday. Patchy frost cannot be ruled out for
some locations. Conversely, southern Florida will remain hot and humid
this weekend as high temperatures rise into the low-to-mid 90s, while heat
indices approach 110 degrees.
Snell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php