Weather Alerts For Troy, IL

# HEADLINE -------------------- EXTREME HEAT WARNING IN EFFECT FROM NOON SUNDAY TO MIDNIGHT CDT THURSDAY NIGHT # DETAILS -------------------- WHAT Dangerously hot conditions with heat index values up to around 110 expected. WHERE In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. WHEN From noon Sunday to midnight CDT Thursday Night. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ISSUED AT Saturday, June 27, 2026 at 1:15 PM CDT ISSUED BY National Weather Service St Louis MO HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. 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 9 1 1. # AREAS AFFECTED -------------------- Jefferson MO, Madison IL, Monroe IL, Saint Charles MO, Saint Clair IL, Saint Louis City MO, Saint Louis MO Including the cities of Alton, Edwardsville, Belleville, Saint Louis, Saint Charles, and Cahokia

There is a Marginal Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN HIGH PLAINS THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE TENNESSEE VALLEY TO THE CAROLINAS SUMMARY Severe thunderstorms are likely today across the northern High Plains including northeast Wyoming and eastern Montana into the western Dakotas, with storms capable of very large hail, very strong outflow winds (80+ mph), and tornadoes late this afternoon into tonight. 20Z Update The previous forecast remains on track, and only minor adjustments were made with this update. The ENH risk was expanded slightly southwestward in northeastern WY, where several discrete supercell have evolved off the Bighorn Mountains -- posing a risk of large to very large hail. In western ND, the CIG1 tornado area was extended slightly northward. Continued diurnal heating amid upper 60s dewpoints will yield moderate-strong surface-based buoyancy and minimal inhibition. Backed surface winds beneath strengthening flow aloft will contribute to favorably curved hodographs. Any storms that can form or move into this environment will conditionally support a strong tornado. Farther east, the SLGT risk was expanded northward in the lower OH Valley. Here, diurnal heating/destabilization of a very moist air mass (upper 70s dewpoints) will continue to support loosely organized thunderstorm clusters capable of producing widely scattered damaging winds this afternoon.