Timing the Impressive Snowfall Rates Thursday Morning

The latest high-resolution rapid refresh (HRRR) model (courtesy WxBell) shows very heavy snowfall rates of one to two inches per hour (dark blue colors in image below) developing across the Washington Region between 3 and 5 AM.

Note the very heavy sleet (orange) and freezing rain (pink) also showing up just south of the Capital Beltway around 10:00 on Thursday morning when the snow party should begin shutting down in the DC metro (points south and east) and the wintry mix of sleet and freezing rain begins in earnest.

Thump of Heavy Snow Accumulations Prior to Wintry Mix

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Breaking: High Impact Snow and Ice Storm Headed for DC Area

The National Weather Service will likely issue Winter Storm Watches today for the entire Washington Region for significant snow and ice depending upon your exact location Wednesday night through Friday morning.

I give this event a snow plow rating of disruptive as I expect snow-covered roadways on Thursday morning with temperatures in the middle to upper 20s.

Snow will begin to mix with and change over to Sleet and Freezing Rain before transitioning to an Ice Storm with Freezing Rain likely across much of the region, mainly east of the Blue Ridge mountains.

Ice amounts could be crippling with over a quarter-inch of ice accretion from Freezing Rain causing scattered to widespread power outages along and east of the Interstate 95 corridor and nearly impossible travel. 

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Updated Snow Map for Super Bowl Sunday Storm

Winter Storm Warnings remain in effect for the entire Washington Area late tonight through Sunday afternoon.

Snow will develop Sunday morning between 3AM and 6AM becoming heavy between 6AM and 10AM before tapering off and ending between 12 Noon and 2PM. Snowfall rates may reach 2″ per hour Sunday morning with poor visibility and snow-covered roads. Conditions will rapidly improve during the early afternoon hours.

Latest North American Model (NAM, courtesy WxBell.com) shows the quick-hitting snow thump across our region:

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