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Posted at 5:00 AM ET, 03/ 4/2008

Forecast: Heavy Rain Likely Tonight

By Matt Ross

Flood Watch in effect through Wednesday morning

After officially reaching 70 yesterday, we have another chance to do it today, albeit without the sunny skies. A powerful cold front accompanied by heavy rain and possible thunderstorms will move through tonight and usher in an air mass that is a little more seasonable for early March. But first we have to get through this evening which may be volatile. Stay tuned for updates on this situation throughout the day.

TODAY

Very mild, heavy rain late. Upper 60s. We will start out the day cloudy, but mostly dry. Strong flow from the south ahead of an approaching cold front and associated storm system will allow temperatures once again to reach the upper 60s. We may see an isolated shower or two (30% chance) during the day, but the main act will hold off until later.

As we approach early evening, heavier rain will move into the western suburbs and make its way eastward. Some of the rain will be in the form of thunderstorms along with gusty winds. With a cold, hard ground, flooding of creeks and streams is possible due to excessive water runoff. The most likely time frame for heavier rain and thunderstorms is between 6pm and 2am.

Overnight, rain will taper in the early morning hours and skies will remain cloudy with lows only dipping to the low 50s.

TOMORROW

Clearing, cooler. Mid 50s. After some early clouds, skies will become sunny in the afternoon on Wednesday, though accompanied by gusty westerly winds. Afternoon highs will be in the mid 50s. Overnight it will be partly cloudy and much colder with lows in the low to mid 30s.

Keep reading for the forecast through the weekend ...

THURSDAY

Mix of sun and clouds, seasonable. 50-55. Thursday will be partly sunny and typical of early March. Look for afternoon highs in the low to mid 50s, which should feel quite pleasant under an increasingly high sun. Overnight clouds will be on the increase as a developing storm system well to our southwest will bring a chance of some light rain or maybe a snow shower. Lows will be in the low to mid 30s.

A LOOK AHEAD

We are keeping our eye on a storm system that will affect the DC region on Friday and early Saturday. Right now it looks like the track of the system will be far enough inland for the entire region to experiece cold rain and temperatures in the 40s, with any snow relegated to the mountains. However, it bears watching this week as changes in the track would have important implications for the forecast. Once the storm exits early Saturday, a more wintry air mass will settle in for the rest of the weekend with highs in the 40s both Saturday and Sunday and chilly lows in the 20s.

By Matt Ross  | March 4, 2008; 5:00 AM ET
Categories:  Forecasts  
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