U.S. Northeast, Midwest face severe storms, flood threats
The big picture: NOAA's Weather Prediction Center issued a Level 3 out of 4 risk for excessive rainfall over parts of the Ohio Valley through Monday morning, with storms containing 3-4"/hour rainfall rates developing Sunday evening. Forecasters said parts of Missouri and Illinois could see "locally significant" flash flooding.
Threat level: A severe thunderstorm warning was issued for parts of Iowa, including Des Moines. Severe thunderstorm watches were issued for parts of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont until 9pm Sunday ET and for portions of Montana and North Dakota through midnight local time.
Per a National Weather Service forecast discussion, there's a a slight risk of severe thunderstorms over parts of the Northeast, including New England; the Ohio Valley into the Central Appalachians; and the Northern and Central High Plains on Sunday and parts of the Northern Plains on Monday.
A tornado warning was issued for Cincinnati, Ohio, the Cincinnati-Northern Kentucky Airport in Ky. and Covington, Ky. Sunday evening.
New York, Boston and Indianapolis were among other major cities under threat from the severe weather. The D.C. area could also see isolated thunderstorms, a day after a flash flood emergency was declared in a Maryland region near the city.
Meanwhile, the NWS warned warned the Central Plains, Lower and Middle Mississippi Valley, and Southeast should expect "dangerously hot conditions."
Driving the news: A cold front over the Northeast to the Ohio Valley was threatening to unleash showers and severe thunderstorms, with the NWS warning potential hazards could include "frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes."
"A quasi-stationary front extending from the Great Basin to the Northern Plains and Middle Mississippi Valley remains quasi-stationary through Tuesday evening," per the NWS.
"The eastern half of the front, extending from the Mid-Atlantic to the Middle Mississippi Valley on Sunday, will move southward to the Southeast and then extend northwestward to the Middle Mississippi Valley by Tuesday evening," per the agency.
"Moisture pooling along the front over the Ohio Valley will produce showers and thunderstorms, accompanied by heavy rain."
What we're watching: A building heat dome across central and southeastern parts of the U.S. was expected to impact much of the Midwest by Midweek, with peak heat indices of 105 to 115 degrees Fahrenheit expected in cities including Chicago Wednesday and Thursday.
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Yahoo
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A major heat risk means there is a risk for heat-related illnesses for most residents, especially for those without access to air conditioning or who don't stay hydrated. Dangerous heat: Heat advisory issued for Palm Beach County as temperatures and humidity soar Heat index and temperature map for US, Florida What is the heat index? The heat index is what the temperature feels like to the human body when relative humidity is combined with the air temperature, according to the National Weather Service. At its most basic: the heat index is what the temperature feels like when you're outside. The chart above shows the combination of air temperature with humidity. It's important to note the chart uses the air temperature in the shade. In direct sun, the air temperature can be up to 15 degrees higher. In Florida, except for Miami-Dade County, the National Weather Services offices around the state would issue a heat advisory if the heat index is expected to reach 108 to 112 degrees. The National Weather Service Miami said Miami/Dade County wanted a lower threshold for an advisory for its population, which was set at 105 degrees. NWS issues several types of heat-related warnings National Weather Service changed its heat watch and warning terms in March 2025. Here's what you should know: Excessive heat watches were renamed to extreme heat watches. Issued when dangerous heat is possible and residents are encouraged to be prepared. Excessive heat warnings were renamed to extreme heat warnings. Issued when dangerous heat is happening or about to happen. What is a heat advisory? Issued for dangerous heat conditions that are not expected to reach warning criteria. ➤ See when heat watches and warnings could be issued in your area What is a heat advisory? A heat advisory is issued for dangerous heat conditions that are not expected to reach warning criteria, according to the National Weather Service. "Residents are advised to consider postponing or rescheduling outdoor activities, especially during the heat of the day. If you must be outside, be sure to drink plenty of water and take frequent breaks in the shade. Stay in a cool place, especially during the heat of the day and evening." When a heat advisory is issued also depends on where you are in Florida. For most of the state, a heat advisory is issued if the heat index is expected to be between 108 to 112 degrees. Here is the breakdown by each NWS region. A heat advisory is issued when the heat index is expected to be: Western Panhandle: 108-112 degrees Central Panhandle, North Florida: 108 to 112 within the next 6 to 24 hours or air temperature is forecast to reach 103 degrees Northeast Florida: 108-112 degrees East Central Florida: 108 to 112 degrees In South Florida: 108 degrees in South Florida or 105 degrees for Miami/Dade and Broward counties Southwest, West Central Florida: 108-112 or the air temp is greater or equal to 103 degrees The National Weather Service Miami said Miami/Dade County wanted a lower threshold for a heat advisory for its population. Signs, symptoms of heat stroke Heat stroke is the most serious of heat-related illnesses, according to the Centers for Disease Control. Signs and symptoms include: Confusion, altered mental status, slurred speech Loss of consciousness (coma) Hot, dry skin or profuse sweating Seizures Very high body temperature Heat stroke is fatal if treatment is delayed What to do: Call 911 Move the person to a shaded, cool area and remove outer clothing Cool the person quickly, using the following methods: With a cold water or ice bath, if possible Wet the skin Place cold wet cloths on the skin Place cold wet cloths or ice on the head, neck, armpits, and groin Soak clothing with cool water Circulate the air around the person to speed cooling Signs, symptoms of heat exhaustion Heat exhaustion is the body's response to an excessive loss of water and salt, usually through excessive sweating, the CDC said. Signs and symptoms include: Headache Nausea Dizziness Weakness Irritability Thirst Heavy sweating Elevated body temperature Decreased urine output What to do: Take the person to a clinic or emergency room for medical evaluation and treatment Call 911 if medical care is unavailable Have someone stay with the person until help arrives Remove the person from the hot area Remove unnecessary clothing, including shoes and socks Cool the person with cold compresses or have the them wash their head, face, and neck with cold water Encourage frequent sips of cool water How to stay safe. What do meteorologists recommend when it's hot outside? ➤ What's the best temperature to set your air conditioner thermostat? Drink plenty of fluids Stay in an air-conditioned room Stay out of the sunshine Check on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Car interiors can reach lethal temperatures in a matter of minutes. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 911. Stay informed. Get weather alerts via text What's next? We will provide weather coverage as conditions warrant to keep you informed and prepared. Download your local site's app to ensure you're always connected to the news. And look for our special subscription offers here. This article originally appeared on Pensacola News Journal: Florida heat advisories issued with heat index up to 115 expected Solve the daily Crossword
