SPC May 18, 2017 Day 4-8 Severe Weather Outlook

By Newsroom America Feeds at 18 May 2017

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0322 AM CDT Thu May 18 2017 Valid 211200Z - 261200Z ...DISCUSSION... The upper-level trough over the Great Lakes early Day 4/Sun will lift northeast into Canada, breaking down the upper ridge over the Eastern Seaboard. Not much in the way of severe weather is expected as this occurs given weak shear and only modest moisture from the mid-Atlantic to New England. Meanwhile, a shortwave trough over the northern Rockies will dig southeast into the Plains and Upper Midwest by Day 6/Tue. Much of this region will be devoid of any better boundary layer moisture thanks to a cold front scouring out Gulf moisture in the Day 3-4/Sat-Sun time frame. This large-scale trough will persist across the central and eastern portions of the country through the end of the period. It is possible some low-end severe threat could materialize from the Gulf Coast states to the Carolinas late in the period as a surface low develops somewhere from the OH Valley to the Deep South ahead of the deepening upper trough, but predictability is too low at this time to highlight any threat. Read more



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