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8:50 AM | *Two waves of precipitation today/tonight in the DC metro region*

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Weather forecasting and analysis, space and historic events, climate information

8:50 AM | *Two waves of precipitation today/tonight in the DC metro region*

Paul Dorian

 Hourly loop of precipitation type by the HRRR model; courtesy tropicaltidbits.com, NOAA

Hourly loop of precipitation type by the HRRR model; courtesy tropicaltidbits.com, NOAA

An initial burst of precipitation this morning will produce sleet in parts of the DC metro region; especially, across northern sections, as low-level temperatures have resulted in a corridor favoring this form of precipitation.  Other areas will see some light rain that can freeze on untreated surfaces over the next few hours; especially, in higher elevation locations.  The precipitation will then tend to slacken off or even stop completely during the mid-day and early afternoon hours and then should resume during the mid-to-late afternoon hours.  By that time, the precipitation should fall mainly as liquid; however, there still can be some freezing on untreated surfaces; especially, across the northern and western suburbs of the metro region. 

 Surface analysis map at 8am showing location of a corridor of ice pellets; map courtesy "crankyweatherguy": Twitter

Surface analysis map at 8am showing location of a corridor of ice pellets; map courtesy "crankyweatherguy": Twitter

Temperatures at 8am ranged from 32 degrees in Gaithersburg, 34 at College Park to 36 at Reagan Airport.  Do not be surprised to see the temperature drop a couple of degrees during the onset of this initial burst of precipitation.  Also, be careful early tonight right after sunset as temperatures could drop a couple degrees and that could be significant in some sections (i.e., right around the freezing mark).  The latest hourly loop of a high-resolution computer forecast model (HRRR) shows the two waves of precipitation for the DC metro region from now into tonight.  

Meteorologist Paul Dorian
Vencore, Inc.
vencoreweather.com