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.
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.
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.