A warm front passed through the area while an upper-level trough approached from the west. A southerly flow behind the front caused an unstable atmosphere, and moderate amounts of instability developed due to colder air aloft ahead of the approaching trough.
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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.
A warm front passed through the area while an upper-level trough approached from the west. A southerly flow behind the front caused an unstable atmosphere, and moderate amounts of instability developed due to colder air aloft ahead of the approaching trough. There was enough instability for some thunderstorms to become severe as a cold front approached from the west.
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 Jun 30, 9:33 AM EST, 2 hours 27 minutes earlier.
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</html>The Sterling radar (KLWX), 118 km away, was scanning. The volume nearest the first event began at 17:00 UTC.
5 thunderstorm wind. Local standard time, as filed.
A tree was reported down near Rocks Rd and Sharon Rd.
Multiple trees were reported down near Ridge Rd and Whiteford Rd.
A tree was reported down near the 100 block of Thunderbird Rd.
Numerous trees and power lines were reported down near the intersection of Cortland Lane and Southern Maryland Blvd.
A tree was reported down at the intersection of Crane Highway and Trade Zone Ave.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2015Every state in 2015This day in weather historyWarnings in Maryland, June 2015
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: 584985, 584986, 584987, 587507, 587508.