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Posted at 04:15 PM ET, 09/06/2011

PM Update: Periods of rain continue, sometimes heavy; warmer Wednesday

Flash flood watch thru Wed. p.m.| Hurricane Tracking Center | NatCast

For the first time since mid-May, the high temperature in D.C. failed to reach 70 degrees. How appropriate for the day after Labor Day? While a northerly wind made it feel like fall, rain remains the big story. Moderate to heavy rain showers are likely overnight and into tomorrow, when a wind shift warms things up a bit. The steadiest rain and greatest risk of flooding will continue to be west of I-95.


Radar & lightning: Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Through Tonight: Rain is pretty much guaranteed overnight, with more intermittent shower activity east of I-95, and steady, driving downpours more likely to the west. New rainfall overnight ranges from around 0.5” east of I-95, with around 1-2” in the western suburbs. Localized heavier (and lighter) amounts than forecast will occur due to sometimes random distribution of downpours. Temperatures are more or less steady, with lows in the low-to-mid 60s

Tomorrow (Wednesday): We see mostly cloudy skies (*maybe* a few peeks of sun) with more intermittent showers and possibly a thunderstorm. Due to considerable spin in the atmosphere, a few weak tornadoes cannot be ruled out especially in the afternoon southeast of I-95 towards southern Maryland. Winds coming in from the southeast give temperatures a boost, with highs 75-82 (northern suburbs to southern suburbs). Rainfall potential is generally 0.25-0.5, with locally higher amounts possible especially in the far western suburbs.

See Matt Rogers’ forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

Pollen: Washed out due to rain

Summer heat records: Christopher Burt, Weather Historian at wunderground, has a great post where he summarizes the countless heat records set this summer. Some of his conclusions:

* So many heat records of various types have been shattered this past summer that it is impossible to quantify them.
* Not since the great heat waves of 1934 and 1936 has the United States seen so many heat-related records broken as occurred this past summer (not to mention last summer, 2010).
* The back-to-back nature of the intensity of the past two summers should raise some interesting questions, questions I am not qualified to address.

By  |  04:15 PM ET, 09/06/2011

Categories:  Forecasts

 
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