Dangerous Widespread Weather
US and Canada Face Extreme Heat and Severe Storms, Heat Indices Soar
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Central New York will face an Extreme Heat Watch from 11 AM Wednesday to 8 PM Friday, with heat indices reaching 105+ degrees; Syracuse could peak near 106 degrees Thursday afternoon, and some western areas may see as high as 109 degrees, following a day when 90+ temps and heat index around 96 are expected today.
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Savannah and the Lowcountry are expected to have a dry spell midweek (Wednesday and Thursday) with temps in the low-to-mid 90s, then a hot, humid 4th of July weekend with afternoon thunderstorms likely and highs around 94–96 degrees; the best chance for storms appears on Sunday.
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Burlington, Vermont forecasters warn of a First Alert Weather day for thunderstorms today, with risks including gusty winds and hail; tornado potential is low but not zero; after the storms, heat and humidity rise with highs in the low to mid 90s and dewpoints climbing into the 70s.
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Ulster is expected to see a mix of showers from the west with heavy, thundery bursts and cooler temperatures around 15–20 C; tonight will bring clear spells in parts of the east but overall cloud increases with more showers tomorrow and heavier rain/drizzle spreading eastward, plus coastal winds.
A dangerous heat dome is tightening its grip on the northeastern United States and Southern Ontario, with Central New York facing a formal Extreme Heat Watch from 11 AM Wednesday through 8 PM Friday. National Weather Service warns that heat index values could top 109°F in western parts of the region — levels not seen in decades. Thunderstorms add to the threat across multiple areas stretching from Toronto to Burlington, Vermont.
New York Governor Kathy Hochul urged residents to use cooling centers and check on elderly neighbors, warning that "extreme heat poses a huge risk if not taken seriously." In Toronto, Mayor Olivia Chow activated all heat emergency measures, opening 24-hour cooling centers and dispatching outreach workers with bottled water to find vulnerable residents.
Syracuse Could Hit 106°F as Heat Dome Peaks
Central New York is bracing for its worst heat stretch in years. The Extreme Heat Watch runs Wednesday through Friday, with Syracuse forecast to reach a heat index of 106°F on Thursday afternoon, 1370wfea.com reported. Western CNY areas could see heat indices as high as 109°F — tying for some of the second-highest June-July readings in 30 years, according to National Weather Service meteorologist Seth Kutikoff.
Even before the watch period begins, Tuesday brings 90°F-plus temperatures and a heat index around 96°F across the region. Scattered thunderstorms could bring damaging winds, large hail, or even tornadoes during the watch window. New Yorkers can text 333111 to get emergency weather alerts from the Governor's Office.
Burlington and Toronto Brace for Storms Then Scorching Heat
Burlington, Vermont is under a First Alert Weather Day Tuesday, with strong to severe thunderstorms bringing gusty winds and hail. WCVB noted that storm threats extend across New England, with Worcester County facing particularly strong cells. Tornado risk is low but not zero, forecasters said. After the storms clear, heat surges — Burlington highs climb into the low-to-mid 90s with dewpoints rising into the 70s, a level that makes nighttime recovery nearly impossible.
Toronto hit 34.2°C (93.6°F) Tuesday with a humidex of 44 at Pearson International Airport. By Thursday, Environment Canada Senior Climatologist David Phillips projected temperatures could reach 37°C (98.6°F). The city added 100 emergency shelter spaces to manage heat displacement. Construction sites across Toronto and Syracuse shifted to early-morning schedules to avoid the 1 PM–5 PM danger window, newsnowwarsaw.com reported.
Savannah Lines Up a Hot Fourth of July Weekend
Savannah and the Lowcountry get a brief dry spell Wednesday and Thursday, with highs in the low-to-mid 90s and no rain. But the Fourth of July weekend brings a return of heat and humidity. Highs on July 4 are expected to reach 94–96°F. The best chance for afternoon thunderstorms arrives Sunday, July 5, which could disrupt outdoor celebrations across the region.
The pattern mirrors what Alabama Weather Network described across the Deep South — heat indices topping 100°F most afternoons this week, with storms firing up each evening as surface moisture and daytime heating combine. Relief may not arrive until early next week as the cold front pushes through.
Ulster Sees Heavy Thundery Rain While North America Bakes
While North America bakes, Ulster in Northern Ireland faces a very different problem. Showers and heavy, thundery bursts are moving in from the west Tuesday, with temperatures holding in a cool 15–20°C range. Brisk coastal winds and increasing cloud cover will bring more showers overnight, with heavier rain and drizzle spreading eastward Wednesday.
Dr. Jared Ulmer of Vermont's Climate and Health Program warned that when overnight lows stay in the mid-to-upper 70s — as they will across CNY and Southern Ontario this week — the human body builds cumulative heat stress on the cardiovascular system. Vulnerable groups including the elderly, unhoused people, and outdoor workers face the highest risk across all affected regions.
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