Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 336 AM EDT Sun Sep 08 2024 Valid 12Z Sun Sep 08 2024 - 12Z Tue Sep 10 2024 ...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