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Helping Business Weather the Storm

National Weather Summary for Wednesday, July 25, 2018

by David Moran, on Jul 25, 2018 11:11:49 AM

An area of low pressure and associated cold front moving across the Plains and Upper Midwest will allow for the potential for thunderstorms on Wednesday. The risk for excessive rainfall will continue for the Northeast and Mid Atlantic as an upper level trough remains in place over the region. There will be a risk of excessive rainfall across portions of Colorado and the Front Range through Thursday along a stalled front.

  • Thunderstorms for the Central Plains and Upper Midwest on Wednesday
  • Excessive Rainfall Wednesday for the Northeast and Mid Atlantic
  • Risk for Excessive Rainfall for Colorado and the Front Range through Thursday
  • Thunderstorms Thursday and Friday for the Rockies 
  • Potential for Thunderstorms for the Lower Great Lakes Thursday
  • Excessive Rainfall for New England Thursday
  • Risk for Thunderstorms Friday from New England to the Central Appalachians
  • Potential for Excessive Rainfall Friday for the Central Plains

US Hazards for Wednesday, July 25, 2018
US Hazards

Thunderstorms for the Central Plains and Upper Midwest on Wednesday
An area of low pressure will track eastward across the Plains and into the Upper Midwest today with the associated cold front tracking south and southeastward. Morning rain and thunderstorms will continue along and ahead of the front, tracking southeastward across the Plains. A few strong to severe thunderstorms may develop. During the afternoon, instability will build to the south of the front. With forcing provided by the front, morning activity will re-intensify and additional thunderstorms will develop. Some of these storms could become strong to severe with large hail, damaging winds, and tornadoes all potential hazards. The threat will transition to damaging winds after sunset.

Major Cities in Region: Goodland, KS, North Platte, NE, Sioux Falls, SD, Omaha, NE, Des Moines, IA, Minneapolis, MN, Green Bay, WI, Milwaukee, WI

Thunderstorm Risk for Wednesday, July 25, 2018
Thunderstorm Risk for Wednesday

Excessive Rainfall Wednesday for the Northeast and Mid Atlantic
Heavy to excessive rainfall will continue for the Northeast and Mid Atlantic on Wednesday as an upper level trough remains in place over the region. Southerly flow will continue to pump high amounts of moisture northward. With the trough providing ample lift, slow moving areas of showers and thunderstorms will persist across the region. Widespread moderate to heavy rain will continue with rainfall accumulations of 1-3 inches and locally higher amounts in excess of 4 inches forecast. Due to this additional rainfall, there will be a risk for flooding and flash flooding across the region.

Major Cities in Region: Albany, NY, New York, NY, Providence, RI

Rainfall Accumulation for Wednesday, July 25, 2018
Rainfall Accumulation for Wednesday

Risk for Excessive Rainfall for Colorado and the Front Range through Thursday
Ample low level moisture will remain in place across portions of the Rockies and Front Range through Thursday as upslope flow continues to bring moisture northward from the Gulf of Mexico. A frontal boundary will slowly move southward across the area and stall. This front will act as a focus for the development of showers and thunderstorms during the afternoon and evening over the next two days. These thunderstorms will be slow moving, allowing for the potential for heavy to excessive rainfall. Rainfall amounts of 1-2 inches with locally higher amounts in 3 inches are expected, bringing an enhanced risk for excessive runoff and widespread flash flooding. 

Major Cities in Region: Denver, CO, Colorado Springs, CO

Rainfall Accumulation for July 25-26, 2018
Rainfall Accumulation through Thursday

Thunderstorms Thursday and Friday for the Rockies
Upslope flow will pump ample moisture into the Front Range and Rockies on Thursday and Friday. As daytime heating increases during the afternoon, instability will build across the region. With ample wind shear in place across the Rockies, isolated to scattered showers and thunderstorms are expected to develop during the afternoon. Some of these storms could become strong to severe with large hail, damaging winds, and tornadoes all potential hazards. Thunderstorms will quickly diminish after the sun sets with the loss of daytime heating. 

Major Cities in Region: Casper, WY, Cheyenne, WY, Denver, CO, Colorado Springs, CO

SPC Convective Outlook for Thursday, July 26, 2018
SPC Convective Outlook for Thursday

Potential for Thunderstorms for the Lower Great Lakes Thursday
A cold front will continue to track southeastward across the Great Lakes on Thursday. With instability and strong wind shear ahead of the cold front, shower and thunderstorm activity is forecast to increase in coverage and intensity along and ahead of the front. A few isolated to widely scattered thunderstorms could become strong to severe with damaging winds and large hail the primary hazards.

Major Cities in Region: Toledo, OH, Detroit, MI, Cleveland, OH, Buffalo, NY

SPC Convective Outlook for Thursday, July 26, 2018
SPC Convective Outlook for Thursday

Excessive Rainfall for New England Thursday
A cold front will be making its way eastward across the Northeast on Thursday. Ahead of the cold front, southerly flow will pump ample moisture northward into New England. With daytime heating creating ample instability and the cold front providing lift, slow moving rain and thunderstorms are forecast to develop. Some of these storms may produce widespread moderate to heavy rainfall. Rainfall amounts of 1-2 inches with locally higher amounts in excess of 3 inches are forecast, resulting in an increased risk of excessive runoff and flash flooding. 

Major Cities in Region: Providence, RI, Boston, MA

Rainfall Accumulation for Thursday, July 26, 2018
Rainfall Accumulation for Thursday

Risk for Thunderstorms Friday from New England to the Central Appalachians
A cold front will track eastward across the Northeast and Mid Atlantic on Friday. With southerly flow continuing to pump ample moisture northward, instability building, and wind shear increasing, thunderstorms are expected to develop along and ahead of the front. These storms will track eastward with hail and damaging winds the primary hazards within the stronger storms. 

Major Cities in Region: Knoxville, TN, Charleston, WV, Harrisonburg, VA, Washington, DC, Baltimore, MD, Philadelphia, PA, New York, NY, Albany, NY, Burlington, VT

SPC Convective Outlook for Friday, July 27, 201 8
SPC Convective Outlook for Friday

Potential for Excessive Rainfall Friday for the Central Plains
An area of low pressure is expected to develop in the lee of the Rockies on Friday. With southerly flow to the south of this low pumping moisture northward and the low providing ample lift, widespread shower and thunderstorm activity is expected. These thunderstorms will pose a risk for heavy to excessive rainfall. Rainfall amounts of 1-2 inches with locally higher amounts in excess of 3 inches are expected, resulting in an enhanced risk for flash flooding and excessive runoff.

Major Cities in Region: Goodland, KS, North Platte, NE

Rainfall Accumulation for Friday, July 27, 2018
Rainfall Accumulation for Friday

A Look Ahead
Showers and thunderstorms may develop across portions of the Plains on Saturday ahead of a cold front. This activity may persist into Sunday. Early next week, thunderstorms may extend from the Southern Plains into the Tennessee Valley on Monday. By Tuesday, showers and thunderstorms will extend from the Ohio Valley into the Southeast. 

Topics:Nowcast/Forecast

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