With temperatures expected to climb well into the 90s tomorrow, a round of strong storms is possible. The most likely areas to see severe storms are the northern suburbs of the D.C. area.

A strong cold front will approach the area and provide the lift for the storms, as indicated on the lifted idexes forecast map below. While there may be a couple of scattered storms in the afternoon time period, several computer models indicate that a squall line will develop and cross the area as shown on the NAM model forecast (right) in the late evening hours.



(Above) NAM model forecast for the late evening hours Tuesday showing a squal line extending from Eastern Canada to the northern suburbs of D.C.
Damaging winds are usually the most dangerous risk with squal lines.





(Above) Lifted indexes are projected to be in the -4 to -5 range in the afternoon and evening hours. Note: lifted indexes are a measure of the instability in the atmosphere...

>0: any thunderstorm development is unlikely
0 to -3: Severe thunderstorms possible but not likely
-3 to -6: Severe thunderstorms possible
-6 to -9: Severe thunderstorms likely
<-9: GET OUT!