Hot and humid conditions overspread parts of Northern Virginia on July 9, producing heat indices above 100 to 110.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
Hot and humid conditions overspread parts of Northern Virginia on July 9, producing heat indices above 100 to 110.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Jul 9, 9:26 AM EST, 1 hour 34 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
2 excessive heat. Local standard time, as filed.
The AWOS at Manassas Regional Airport (KHEF) measured a peak heat index value of 110. Several mesonets in the county measured peak heat indices around 110.
The ASOS at Ronald Reagan Washington National Airport (KDCA) measured a peak heat index value of 112. Several mesonets in the county measured peak heat indices around 110.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2024Every state in 2024This day in weather historyWarnings in Virginia, July 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 1204896, 1204897.