Thursdy, October 29th 2009 Weather Outlook

28 10 2009

Thursday’s Weather Outlook; Front Range/Plains/Midwest/Great Lakes/Mississippi Valley System, Northwest System


On Thursday, a system will push through the Plains, as a system pushes through the Northwest. Showers and storms will be likely in portions of the Plains, Midwest, Great Lakes and Mississippi Valley, associated with a system pushing through the Plains. There is a slight risk for severe sotrms in portions of Kansas, Oklahoma, Texas, Missouri, Arkansas and Louisiana.  Scattered showers and storms should be ongoign across portions of the risk area during the Morning. In the wake of this activity, Cape values upp get up to around 3500 J/KG, LI’s up to -7 and Effective Bulk Shear values up to 75KT. A line of severe storms will develop druing the Afternoon and Evenign along the cold frotn from Oklahoma down into Texas. This line will push eastward through the Night, with a continued severe threat. Ahead of this line, discrete cells may develop, which may also become severe. The main threats from the severe storms will be damaging winds, hail and an isolated tornado. Flooding rainfall will be likely in portions of the Missisisppi Valley, due to the high moisture content and training storms. On the northside of the system, accumulating snow will be likely from the Front Range up through the Plains. Over 1 foot of snow will be likely in portions of the Front Range, with up to 1 foot of snow in the Plains. High winds will create blizzard conditions at times, with blowing and drifting snow. In the Northwest, a system will continue to push through the area. Rain will be likely, with accumulating snow being likely in portions of the Cascades and Rockies. Below are the severe weather and snowfall outlooks for Thursday.

sev 705

snow 44

October 27-30th 2009 Inter-Mountain West/Plains Blizzard

28 10 2009

Tuesday-Friday Inter-Mountain Wesy/Plains “Winter” Storm


A powerful system will push through the Inter-Mountain West and Plains, Tuesday into Friday. Heavy snowfall will be likely on the north side of this system from New Mexico up into the Dakotas. Several inches of accumulation can be expected, ranging from up to 12″ in the lower elevations and Plains, to 1-3 feet in the higher elevations where an upslope flow will increase accumulations. High winds will create blizzard conditions at times, with blowing and drifting snow. Below is the snowfall map for this system.

snow 42