NEW: Severe Thunderstorm Warning in effect for Fairfax County

Update at 2:11 p.m.: The county is under a Severe Thunderstorm Warning from 2:09 to 3 p.m. today (Thursday).

Earlier: After two days of excessive heat, rain is officially on the horizon.

Fairfax County and other neighboring jurisdictions are under a Severe Thunderstorm Watch.

The National Weather Service issued the watch around 1:15 p.m. It is in effect until 9 p.m. and includes much of eastern Pennsylvania and portions of New York State.

Forecasters say that scattered strong storms are likely later today in the immediate D.C. area.

“Damaging wind gusts are the primary threat. Isolated instances of considerable wind damage from severe thunderstorms are possible. Isolated instances of large hail are possible as well,” the National Weather Service said.