National Weather Summary for Friday, November 3, 2017
by David Moran, on Nov 3, 2017 10:48:22 AM
Snow will continue for portions of the Northern Rockies and Plains through Sunday as an upper level disturbance moves over the region. Heavy snow is forecast across portions of the Sierra Nevada through early Sunday as Pacific moisture streams into the region. A cold front moving into the Deep South will be the focus for thunderstorms on Friday.
- Snow for the Northern Rockies and Plains through Sunday
- Heavy Snow through early Sunday across the Sierra Nevada
- Thunderstorms for the Deep South on Friday
- Severe Thunderstorms for the Great Lakes and Ohio Valley on Sunday
Snow for the Northern Rockies and Plains through Sunday
Snow will continue for portions of the Northern Rockies and Plains through Sunday as an upper level disturbance moves across the region. Widespread accumulations of 3-6 inches with locally heavier amounts in excess of 8 inches are forecast for the lower elevations. Above 5,000 feet, snowfall amounts of 8-12 inches are expected with locally higher amounts in excess of 2 feet. Further east across northern and eastern Montana, snowfall amounts of 2-4 inches with locally higher amounts in excess of 5 inches are forecast. Into the Northern Plains, snow will continue through early Sunday morning; accumulations could range 3-5 inches with locally higher amounts in excess of 6 inches,
Major Cities in Region: Helena, MT, Billings, MT, Minot, ND, Bismarck, ND, Grand Forks, ND, International Falls, MN, Duluth, MN
Heavy Snow through early Sunday across the Sierra Nevada
A large fetch of Pacific moisture will stream into the Sierra Nevada over the next several days. Lifting from the mountains along with a cold front will result in significant snowfall and high winds late Friday through early Sunday. Widespread snowfall totals of 12-18 inches are likely around 6,500 feet. Higher elevations will likely see totals in excess of 2 feet. Additionally, winds of 20-30 mph with gusts in excess of 50 mph will limit visibilities to less than a tenth of a mile at times.
Major Cities in Region: Reno, NV, Carson City, NV
Thunderstorms for the Deep South on Friday
With deep moisture in place and daytime heating, moderate instability is expected to build. A weak cold front is also expected to be in the region, and should help provide forcing for the development of strong to severe thunderstorms this afternoon. Damaging winds will be the primary hazard, but some large hail will be possible. These storms should continue into the evening with activity weakening after sunset.
Major Cities in Region: Pine Bluff, AR, Tupelo, MS
Severe Thunderstorms for the Great Lakes and Ohio Valley on Sunday
Across the Great Lakes and Ohio River Valley, there will be a threat for strong to severe thunderstorms during the afternoon and evening hours on Sunday. An area of low pressure in Canada will continue to track northeastward away from the US, however, the associated warm front will track northward into Canada and the associated cold front will track eastward. Warm moist air will be lifted northward across the region, resulting in increasing instability. This instability combined with ample low level moisture and wind shear will result in scattered shower and thunderstorm development. Some storms could become severe with large hail, damaging winds, and tornadoes all potential hazards. Into the evening, storms will become linear and the primary hazard will transition to damaging winds. In addition to the severe potential, there will be a risk for excessive rainfall from western New York into the Ohio Valley given ample moisture and slow movement of thunderstorms. Rainfall amounts of 0.75-1.50 inches with locally higher amounts in excess of 2 inches are expected, leading to a risk for excessive runoff and flash flooding.
Major Cities in Region: St. Louis, MO, Milwaukee, WI, Chicago, IL, Evansville, IN, Indianapolis, IN, Louisville, KY, Cincinnati, OH, Detroit, MI, Columbus, OH, Cleveland, OH
SPC Convective Outlook for Sunday
A Look Ahead
Thunderstorms will continue to move eastward from the Great Lakes and Ohio River Valley to the East Coast Monday as the cold front described above continues to push eastward. Into Tuesday, thunderstorms may develop over portions of Virginia as an area of low pressure moves eastward. Some light snow may also develop across portions of the Rockies and the High Plains on Tuesday.
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