A HEAT ADVISORY is in effect from 11 am until 9 pm tomorrow

High pressure has pushed the temperature to 100 degrees in Washington this afternoon. Fortunately, humidity levels are only adding a couple degrees to the Heat Index…more humid conditions are likely tomorrow. High pressure has also suppressed thunderstorm development across the region. HOWEVER… as a cold front slowly approaches the area tomorrow afternoon and evening, the chances of thunderstorms will increase. Temperatures will once again reach the upper 90s but increasing humidity levels will make it feel close to 105 degrees at times.

On Thursday, the cold front will continue its slow movement through the mid- Atlantic keeping high chances for more scattered thunderstorms. Although it will turn somewhat cooler on Friday, enough instability will remain in the atmosphere combined with intense mid -July sunshine to trigger more afternoon thunderstorms.