Washington D.C. Forecast: Severe storms and high heat this evening

      This Evening:Strong to Severe Storms Temperatures: 90s Heat Index: 100-105+ Tonight:Partly Cloudy and Muggy Lows: 70s Wind: S 4-8 m.p.h. Thursday:Storms Likely, Possibly Severe Highs: Near 90 Precipitation: 80%

      SEVERE THUNDERSTORM WATCH in effect until 8 pm for the entire areafrequent lightning, torrential downpours, high winds and hail possible with the storms HEAT ADVISORY in effect until 7 pm

      Strong upper level winds high above the extremely hot and humid air at the surface produced a line of severe thunderstorms across the region this afternoon. Later tonight, skies will be clear to partly cloudy and it will remain very warm and humid. High pressure, responsible for the high heat and humidity will be in place tomorrow as a cold front approaches from the west. This will lead to a high likelihood of more numerous showers and thunderstorms during the afternoon and evening.

      At the same time, strengthening TS Arthur will be moving northward just offshore of the Carolina Coastline. It is expected to become a hurricane late at night. The Outer Banks of NC will get a brief brush of hurricane conditions, Mid-Atlantic beaches may have brief Tropical Storm conditions. Rapid clearing and improvement is expected during the day Friday. Friday night through Sunday should be just fine in our area and at the beaches, too. Dangerous surf conditions at the beaches early Thursday through Friday,