Major Winter Storm to Impact the Mid-Atlantic and Northeast; Inclement Weather in the Pacific Northwest

A major winter storm is expected to bring heavy snow, strong winds, and coastal flooding across the Mid-Atlantic and Northeast that may cause impossible travel conditions and power outages. Blizzard conditions are possible along coastal areas from the DelMarVa Peninsula through southeastern New England. Wet weather and strong winds return to the Pacific Northwest and north-central California. Read More >

Overview

The afternoon of July 5th, storms developed along a boundary between very dry air and very moist air. This setup supported isolated storms and strong straightline winds. The most impressive storm produced a microburst (a very narrow area of strong winds within a thunderstorm) right over Mina Lake, causing structural damage, uprooted trees, and flipped boats and pontoons. This same storm tracked southeast and eventually produced hail and strong winds in the Northville/Mellette area. Large hail was also reported between Bath and Groton.

A second area of storms further west produced large hail near Isabel and tracked southeast. Several strong wind reports from 58 to 65 mph were reported along the Missouri River Valley.

SPC Storm Reports from July 5, 2017. Interactive map here: http://www.spc.noaa.gov/climo/gmf.php?rpt=170705_rpts_filtered

Wind & Hail
Radar

Wind & Hail:

Microburst

A microburst (a very narrow area of strong winds within a thunderstorm) developed over Mina Lake in Edmunds County. Winds were estimated around 80 mph.


Uprooted Tree at Mina Lake, Photo Credit Jennifer Pint	Downed Tree at Mina Lake, Photo Credit Jennifer Pint	Flipped Pontoon at Mina Lake, Photo Credit Sara Jo Bonn	Microburst seen from the NWS Aberdeen instrument tower cam at 6:10 pm CDT

Wind & Hail


Golfball Size Hail 6 W of Groton, Photo Credit: Joel	Quarter Size Hail Near Richmond Lake, Photo Credit: Gene Wolter	Grain Bins Knocked Over Near Northville, Photo Credit: Rondi Torrence

Radar:


Radar Reflectivity overview at around 6:30 pm CDT	Radar Reflectivity & Velocity at the time of the microburst over Mina Lake. The black arrow denotes the higher velocity values from the microburst

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Major Winter Storm to Impact the Mid-Atlantic and Northeast; Inclement Weather in the Pacific Northwest

Hail & Microburst Damage July 5, 2017