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Flood watches posted for Baltimore and Washington DC

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The National Weather Service at Baltimore-Washington has issued a Flash Flood Watch and a Coastal Flood Watch in effect from Tuesday night through Wednesday morning. An active weather pattern will produce moderate to occasionally heavy rain over the Middle Atlantic states during this period. 1 to 2 inches of rainfall, with locally higher amounts, can be expected. Isolated severe thunderstorms are possible through Wednesday evening.

Weather Summary

After a sunny morning, clouds continue to increase around the area as we transition from a dry weather pattern to a wet period. Showers are expected to overspread the area overnight and into Tuesday morning. Temperatures will be quite cool on Tuesday with highs only in the 50s. Meanwhile, an area of low pressure will move into the Great Lakes region and its associated warm front will move northward across the Middle Atlantic states. The result will be widespread steady rainfall and occasional thundershowers on Tuesday afternoon through Wednesday as the warm air overrides cooler air the surface. Some of the rain showers may produce heavy rain, hence the need to post flood watches in some areas. Most thundershowers and thunderstorms will be garden variety, but a few may become severe with strong winds and possible tornadic activity. A cold front will push from west to east toward Chesapeake Bay by Wednesday night. This will produce additional showers and thundershowers. Rainfall amounts from Monday night through Wednesday night may exceed 1 to 2 inches with locally higher amounts. The warmest day of the week will be on Thursday as warm air surges north in advance of the cold front. Once the front clears the area, a sunny Friday and Saturday can be expected with lows in the upper 40s to lower 50s and highs in the mid to upper 60s.

Regional Weather Information

Baltimore average lows and highs

Washington average lows and highs

National Weather Service daily weather discussion

Baltimore/Washington National Weather Service

Chesapeake Bay marine forecast

Mid-Atlantic radar loop

For more weather updates, please visit my web site www.chesapeakebayweather.com, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.

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