United States.- The Weather Prediction Center of the National Weather Service, warned that concerns about excessive heat and fire weather continue to affect a large part of the western and northern High Plains.
Separately, heavy rains and the threat of flash flooding spread from southern New England and the Ohio/Tennessee valleys to the western Gulf Coast through Tuesday.
Isolated chances of severe storms and flash flooding exist throughout the Southwest today. As in recent days, unprecedented and excessive heat continues to be found throughout the western United States today and remains the case through at least midweek.
Beneath a strong high anchored over the central Great Basin, high temperatures are forecast to rise well above average and into triple digits. The heat is expected to further increase in severity on Tuesday, with temperatures potentially reaching 110 across California’s Central Valley region.
These highs in California will likely threaten monthly temperature records and be particularly dangerous for vulnerable residents.
Record heat also include much of the central Great Basin and northern Rocky Mountains, with highs in the upper 90s extending as far east as the north/central Plains.
Excessive heat watches and heat advisories have been issued for most of California and Nevada, as well as parts of Arizona, Utah and Idaho. Additionally, scorching heat combined with low relative humidity and gusty winds can lead to critical fire weather conditions today throughout parts of the Great Basin.
Conditions favorable for wildfires to develop and spread out of control also extend north into the Rocky Mountains and north into the High Plains, where red flag warnings have been issued.
Residents and visitors are urged to follow proper fire and heat safety restrictions.
For the Gulf Coast and the eastern third of the Nation, heavy rains and scattered instances of flash flooding will continue to be a concern through the first half of the week.
An elongated upper level low extending over the lower and middle Mississippi valleys will help produce numerous showers and thunderstorms over the Ohio and Tennessee valleys through Labor Day.
Some storms can move slowly and produce intense rainfall rates, which could lead to flash flooding. A slight risk (Level 2/4) of excessive rainfall has been issued for much of this region today and Tuesday, as well as portions of southern Appalachia.
Heavy rain is also possible along a cold front as it slides south from the northeast to the northern Mid-Atlantic by midweek.
A few inches of rain within a short period of time could produce scattered flash flooding Monday from southern New England to the central Appalachians, including most of Pennsylvania.
For the Gulf Coast, a stagnant, tropical air mass will create additional opportunities for showers today, with the threat of more widespread heavy rains moving toward the western Gulf Coast and south Texas by Labor Day. As a result, there is a Slight Risk of Excessive Precipitation.
Effect for today and Monday over South Texas and the lower Texas coast. Elsewhere, isolated showers and thunderstorms across the Southwest today could bring damaging wind gusts and flash flooding.
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The greatest threat is expected to reside in southern California and the Mojave. Desert region, where marginal risks from severe weather and excess rainfall are in effect.