Heavy Rainfall and Severe Thunderstorm Threats; Heat Risk Expands; Monitoring the Tropics

Flash flooding risks continue for portions of the Four Corners and Great Basin through today. Severe thunderstorms are outlooked from the eastern Great Lakes, southern New England into the mid-Atlantic through Tuesday. Heat risk increases and expands across the center of the nation and across the Ohio Valley and mid-Atlantic this week. Continue to closely monitor tropical development in the Gulf. Read More >

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Last Map Update: Mon, Aug 31, 2026 at 12:38:13 pm MDT

Watches, Warnings & Advisories

National Weather Service Grand Junction, CO

National Weather Service NWS Flagstaff, AZ

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National Weather Service NWS Tucson Arizona

Flood Watch

Hazardous Weather Outlook

Rainfall Monday

Storm Outlook Today

Tuesday & Wednesday

Hazardous Heat

Showers and thunderstorms will favor areas along and west of the Central Mountain Chain on Monday. Storms will move toward the north and northeast around 15 to 25 mph. Most likely rainfall amounts will generally be up to one inch, though localized areas may receive 1.5 to 2 inches of rainfall through Monday night. Heavy rainfall may cause flash flooding in areas that see repeated rounds of rainfall.

Three rounds of storms are expected today. Round 1 will impact mainly northwest and west central NM where light to moderate rainfall and few lightning strikes will occur from around 8am through 2pm. Round 2 will feature showers and thunderstorms capable of heavy rainfall and gusty winds near the Continental Divide and along the Central Mountain Chain between 1pm and 9pm. Round 3 will feature colliding outflow boundaries in the Rio Grande Valley which should spark additional thunderstorm development between 5pm and 9pm. Showers and isolated storms will linger between the Continental Divide and the Central Mountain Chain through the overnight hours.

Though precipitation chances decrease Tuesday and Wednesday, there remains a chance for isolated to scattered showers and thunderstorms from the southwest mountains to areas east of the Central Mountain Chain. Gusty winds and brief heavy rainfall will be a concern. Precipitation chances may trend upward for both Tuesday and Wednesday.

Heat can escalate quickly. Warm temperatures can quickly become dangerous. Heat is one of the most deadly weather hazards - don't underestimate it. Never leave people or pets alone in a car. Drink plenty of water, even if you don't feel thirsty. Wear loose-fitting, light-colored clothing. Spend time in air conditioning and in the shade.