
Central cold fronts and Danny
M. Ressler, Lead Meteorologist, The Weather Channel
Aug. 27, 2009 1:27 pm ET
South |
Other than slightly increased surf and a continued heightened rip current threat, Danny?s effects on the Southeast Coast should be minimal as it passes well east of the Outer Banks Friday night.
Meanwhile, two upper-level disturbances, one moving into the Southeast and a second moving into the lower Mississippi Valley will trigger scattered thunderstorms from parts of parched southern Texas, Arkansas and Louisiana eastward to the Carolinas, Georgia and Florida all day Friday.
A cold front will lag back in Arkansas and north Texas.
Highs Friday will range from upper 60s and 70s in the southern Appalachians to the low 100s in southernmost Texas.
On Saturday as the cold front presses farther into the lower Mississippi Valley, thunderstorms will develop from Tennessee to the northern Gulf Coast and Florida.
On Sunday, the cold front will push into the Southeast and the northern Gulf with thunderstorms extending from eastern Tennessee and North Carolina to the northern Gulf Coast and Florida.
By Monday and Tuesday, the cold front will stall from the coastal Carolinas to Florida.
As the heat eases in Texas, a pleasant air mass will follow the cold front into the Deep South. By early week, low temperatures will be in the 50s from Arkansas to northern Georgia and the western Carolinas with highs in the 70s and lower 80s.
Midwest |
Two cold fronts will join forces in the Mississippi Valley Friday.
While the Plains clear out, thunderstorms will continue to develop from parts of Minnesota, Iowa and Kansas into the Great Lakes and Ohio Valley.
Highs Friday will range from the upper 50s and low 60s around western Lake Superior to the low and mid 80s in the Ohio Valley and parts of the central Plains.
On Saturday, as the cold front pushes through the eastern Great Lakes and Ohio Valley, any lingering showers and thunderstorms will be increasingly confined to northern Michigan, Ohio and Kentucky.
Cooler air will dip morning lows into the 40s across parts of the Dakotas, Nebraska, Minnesota, northern Wisconsin and Upper Michigan. Highs Saturday will range from the 50s around Lake Superior to the low 80s in western Kansas.
Except for a few showers around the Great Lakes Sunday and scattered thunderstorms in parts of the Plains early week, the region should be dry.
Morning lows could dip into the 30s in parts of the Upper Midwest away from the Lakes early week.
Northeast |
North of a stalled front in the Mid-Atlantic, northern New York and northern New England will start Friday with some scattered frost.
Showers and thunderstorms will continue to develop across the Mid-Atlantic and begin to push northward into Upstate New York and southern New England later in the day.
Highs Friday will range from between 65 and 75 north of the front to between 75 and 85 south of the front.
Saturday into early Sunday, Danny will approach and then possibly brush past eastern New England.
An area of high pressure to the north of Danny could aid in upping the winds along coastal New England.
How close Danny will come is still unclear, but along with increased surf, rip currents and coastal flooding issues, heavy rains and strong winds are possible.
Showers and thunderstorms will continue over the rest of the region as a cold front pushes in from the west.
Highs Saturday will range from the upper 50s in northern Maine to the low 80s in Virginia.
By Sunday, Danny will likely be extra-tropical in the Canadian Maritimes but the eastbound cold front will still be producing showers and thunderstorms over most of the region.
Monday and Tuesday, the region will be drying out and temperatures will be on the cool side.
West |
A small piece of the big storm in the northern Pacific will edge into the Pacific Northwest Friday, popping showers and a few thunderstorms from the Cascades and Siskiyou to the coast.
Otherwise the West will end the workweek dry.
Highs Friday will range from the 60s and 70s in the showers west of the Cascades to the 80s in Montana, the 90s in Idaho?s Snake River Valley and between 105 and 120 in the Desert Southwest.
Once onshore, the upper-level disturbance that broke away from the Pacific storm will wander from the Pacific Northwest into the Rockies by early week, popping an increasingly wider area of thunderstorms.