NWS Climate Prediction Center

ALT Dangerous heat will persist across the Southwest through Friday with daytime highs of 110-115°F. Expect numerous daily record highs and Major to Extreme HeatRisk. Little overnight relief is expected as many areas may not cool below 80°F for several nights in a row. Temperatures return to near-normal levels over the weekend. Dangerous heat will build across the Southern Plains again beginning this weekend, and persist into next week. Daytime highs of 95-105°F, with limited recovery at night due to lows only in the mid-70s (°F), will result in widespread Major to Extreme HeatRisk. Increased chances for extreme heat continue into early Sep. A moderate risk (40-60% chance) of extreme heat remains highlighted across the south-central CONUS and Lower and Middle Mississippi, and Tennessee Valleys, Sep 4-6. Limit outdoor activity, stay hydrated, and ensure access to A/C or cooling centers. Check on vulnerable family, friends, and neighbors. Never leave kids or pets unattended in vehicles.

ALT An expanding heat wave will build across much of the central and southern areas of the Lower 48 this weekend into next week. Dangerous and record-breaking temperatures are possible. The heat will continue into week 2, spreading into the West. Graphics show the maximum HeatRisk over the country through next Thursday and the chance for continuing heat during the first week of August.

ALT Dangerous heat will expand from the Gulf Coast into the Southern Plains and Desert Southwest through the end of the week. Additional extreme heat will shift eastward from the Pacific Northwest in the middle of this week to the northern Plains by the weekend. A high risk of extreme heat covers the Central and Southern Plains and Lower Mississippi Valley July 29-30. Extreme heat may persist over the rest of the Plains and expand over the west late July and early August. Several consecutive days of hazardous heat are expected due to the combination of hot afternoon highs and warm overnight lows. Highs of 95-105 F with heat indices exceeding 105-115 F in some locations are possible. Record warm overnight lows of 75-80 F are also expected. This will cause accumulated heat stress resulting in widespread major, to locally extreme, HeatRisk. Anyone without adequate cooling or hydration may experience heat related health concerns.

ALT The first widespread significant heat wave of summer across the Intermountain West and Plains is expected to develop on Friday and then expand through early next week. Widespread high temperatures of 95-105 degrees are expected, with local maxima above 110 degrees possible. This could produce numerous daily high, and a few monthly to all time, temperature records. Extremely hot daytime highs combined with potentially record-warm lows will result in increasing heat stress, leading to widespread major to locally extreme HeatRisk. This heat will quickly become dangerous to anyone without adequate cooling or hydration. In the Plains, this heat will be especially dangerous as normal to below-normal June temperatures have limited heat acclimation. Remember to protect yourself by limiting outdoor activity, keeping hydrated, and ensuring access to A/C or cooling centers. Never leave children or animals unattended in vehicles, and make sure outdoor pets and livestock have access to water.

ALT A subtropical ridge will bring hazardous heat across parts of the Carolinas and Southeast, with highs in the 90s to low 100s and record breaking highs Thursday through Saturday. The combination of hot temperatures and high humidity will create heat indices up to 105-110 degrees. Overnight temperatures will provide little relief as the lows will drop to the mid to upper 70s to 80s. Areas of major to extreme HeatRisk are forecast across portions of the Carolinas, Georgia, and Florida through the weekend. This level of heat will affect anyone without adequate cooling or hydration. Hazardous heat will continue in Florida into next week, but should wane across the remainder of the Southeast before increasing again. Prolonged periods of extreme heat are among the deadliest weather hazards in the U.S. because the impacts build over time. Protect yourself by limited time outdoors, stay hydrated, and ensure access to A/C or cooling centers.

ALT The first widespread significant heat wave of summer across the Intermountain West and Plains is expected to develop Friday and then expand northeast through early next week. Widespread high temperatures of 95-105 degrees are expected, with local maxima above 110 degrees possible. This could produce numerous daily high temperature records. Extremely hot daytime highs combined with potentially record-warm lows will result in increasing heat stress, leading to widespread major to locally extreme HeatRisk. This heat will quickly become dangerous to anyone without adequate cooling or hydration. Remember your Heat Safety In many areas of the Plains, this heat will be especially dangerous as normal to below-normal June temperatures have limited heat acclimation. Remember to protect yourself by limiting outdoor activity, keeping hydrated, and ensuring access to A/C or cooling centers. Never leave children or animals unattended in vehicles.

ALT High temperatures in the 90s to low 100s will make for a significant heat wave across the central and eastern U.S. beginning on Sunday and lasting through next week. These hot temperatures combined with high humidity will lead to heat indices of 100-110 degrees, and locally as high as 115. Low temperatures only dropping into the 70s will provide little overnight relief. Multiple days of Major to Extreme HeatRisk are forecast across the Mississippi and Ohio Valleys next week. These levels of heat mean health impacts become more likely in general, and may occur in ANYONE without adequate hydration or cooling. High or moderate extreme heat risks cover much of the U.S. east of the Rockies July 4-5, with a broader slight risk through July 7 extending as far west as the Great Basin. Heat indices of 100-110 degrees are possible, and warm nights in the 70s-80s may limit relief over the holiday weekend. Stay informed and take steps to protect yourself from heat related illnesses.

ALT The first heat wave of the season will impact much of the country to the east of the Rockies by next week with the Central and Southern Plains being the first to see impacts, followed by the east coast by the second half of the week. High temperatures will be several degrees above normal with increasing humidity leading to excessive heat for a large portion of the U.S.