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Helping Business Weather the Storm

National Weather Summary for Thursday, July 27, 2017

by David Moran, on Jul 27, 2017 11:23:48 AM

There will be a risk for thunderstorms and excessive rainfall from the Plains to the East Coast on Thursday as an upper level system moves eastward. Increasing instability across the High Plains on Thursday may allow for the development of thunderstorms. Excessive rainfall will be a concern from the Southwest into the Southern High Plains on Thursday ahead of a cold front.

  • Thunderstorms from the Plains to the East Coast on Thursday
  • Risk for Thunderstorms Thursday across the High Plains
  • Excessive Rainfall from the Southwest to the Southern High Plains on Thursday
  • Thunderstorm Potential Friday from the Lower Mississippi Valley to the East Coast
  • Strong to Severe Thunderstorms for the High Plains on Friday
  • Excessive Rainfall Friday from the Central Appalachians to the East Coast 
  • Continued Risk for Excessive Rainfall from the Southwest to the Central High Plains on Friday
  • Potential for Thunderstorms Saturday across the Southeast
  • Excessive Rainfall from the Central Rockies to the Central High Plains on Saturday
  • Excessive Rainfall Saturday for the Mid Atlantic 

US Hazards for Thursday, July 27, 2017US Hazards

2017 Tropical Season Outlook Webinar

Thunderstorms from the Plains to the East Coast on Thursday
A cold front slowly moving southeast between the Ohio Valley and western Oklahoma generated a complex of showers and thunderstorms over the Central Plains and Ozarks overnight. This weakening complex is creating outflow boundaries that are moving eastward and southward. Moderate instability ahead of the front and aforementioned outflow boundaries are forecast to allow the development of additional thunderstorms this afternoon and through the early evening. Widespread severe weather is not expected, but one or two higher end storms could produce strong wind gusts. Storms should diminish after sunset.

Major Cities in Region: Oklahoma City, OK, Nashville, TN, Cincinnati, OH, Washington, DC, Philadelphia, PA, New York, NY

Region 1 Thursday, July 27, 2017Region 1

Risk for Thunderstorms Thursday across the High Plains
A weak area of low pressure, moderate instability, and daytime heating will allow for widely scattered thunderstorm development beginning near the high terrain during the early to mid afternoon. Activity may persist through the early evening with damaging winds the primary hazard.

Major Cities in Region: Denver, CO, Cheyenne, WY, Scottsbluff, NE

Region 2 Thursday, July 27, 2017Region 2

Excessive Rainfall from the Southwest to the Southern High Plains on Thursday
As the tail end of a cold front moves southward through the Southern Rockies and Southern Plains, it will produce scattered thunderstorms across the region during the afternoon and evening. With deep moisture in place, there will be a possibility for excessive rainfall across the region. General rainfall amounts of 0.50-1.50 inches are expected, with locally heavier amounts in excess of 2 inches. 

Major Cities in Region: Albuquerque, NM, Santa Fe, NM, Trinidad, CO

Excessive Rainfall Risk Outline for Thursday, July 27, 2017Excessive Rainfall Risk Outline for Thursday

Thunderstorm Potential Friday from the Lower Mississippi Valley to the East Coast
An area of low pressure will intensify and move eastward into the Mid Atlantic. Its associated cold front will track southeastward through the Southeast. These features will promote the development of scattered thunderstorms across the Southeast with more widespread activity over the Mid Atlantic. Thunderstorms ongoing during the morning and associated cloud cover will lead to some uncertainty in the overall threat. However, there will be a risk for severe thunderstorms capable of producing large hail and damaging winds. 

Major Cities in Region: Memphis, TN, Jackson, MS, Nashville, TN, Birmingham, AL, Atlanta, GA, Raleigh, NC, Washington, DC, Norfolk, VA

SPC Convective Outlook for Friday, July 28, 2017SPC Convective Outlook for Friday

Strong to Severe Thunderstorms for the High Plains on Friday
A weakening front moving across the Rockies will lead to the development of isolated thunderstorms across the central and northern High Plains on Friday during the afternoon and evening. Daytime heating combined with favorable wind shear will allow for a few strong to severe thunderstorms. Gusty winds and hail will be the primary hazards with these storms.

Major Cities in Region: Denver, CO, Cheyenne, WY, North Platte, NE

SPC Convective Outlook for Friday, July 27, 2017SPC Convective Outlook for Friday

Excessive Rainfall Friday from the Central Appalachians to the East Coast 
An intensifying area of low pressure moving eastward into the Mid Atlantic will generate a potential for excessive rainfall from the Central Appalachians to the East Coast on Friday. Scattered to widespread showers and thunderstorms will spread from west to east across the region throughout the day, with rainfall amounts of 1-3 inches and locally higher amounts in excess of 4 inches expected. 

Major Cities in Region: Knoxville, TN, Pittsburgh, PA, Raleigh, NC, Washington, DC, Philadelphia, PA, New York, NY

Excessive Rainfall Risk Outline for Friday, July 28, 2017Excessive Rainfall Risk Outline for Friday

Continued Risk for Excessive Rainfall from the Southwest to the Central High  Plains on Friday
A stalled frontal boundary moving through the High Plains will interact with monsoonal moisture as it continues to overspread the region. This will bring scattered showers and thunderstorms to the region. Rainfall amounts will average 0.50-1.00 inch with locally higher amounts in excess of 1.50 inches.

Major Cities in Region: Tucson, AZ, Albuquerque, NM, Santa Fe, NM

Excessive Rainfall Risk Outline for Friday, July 28, 2017Excessive Rainfall Risk Outline for Friday

Potential for Thunderstorms Saturday across the Southeast
Thunderstorms are expected to be ongoing early in the day across portions of the Southeast in the vicinity of a slowly advancing cold front. This will likely be followed by additional development during the afternoon and early evening before tapering off. Favorable lift along the cold front along with strong mid level winds will produce at least a marginal risk for strong to severe thunderstorms. Gusty winds will be the primary hazard with these storms. 

Major Cities in Region: Jackson, MS, Mobile, AL, Montgomery, AL, Tallahassee, FL, Savannah, GA, Charleston, SC

SPC Convective Outlook for Saturday, July 29, 2017SPC Convective Outlook for Saturday

Excessive Rainfall from the Central Rockies to the Central High Plains on Saturday
A lingering stationary front will produce continued rain chances across portions of the central Rockies into the central High Plains on Saturday. Showers and thunderstorms will be possible throughout the day with rainfall amounts of 0.50-1.00 inch and locally higher amounts in excess of 1.50 inches. Given previous days of heavy rain, there will be an increased risk of flooding.

Major Cities in Region: Colorado Springs, CO, Dodge City, KS

Excessive Rainfall Risk Outline for Saturday, July 29, 2017Excessive Rainfall Risk Outline for Saturday

Excessive Rainfall Saturday for the Mid Atlantic 
Showers and thunderstorms associated with an area of low pressure moving through the region will continue to spread across much of the Mid Atlantic on Saturday. This activity may begin to taper off by evening or overnight as the low moves offshore and weakens. Rainfall amounts of 1-2 inches with locally higher amounts in excess of 3 inches are forecast. Given the expected heavy rain on Friday, this may lead to an increased risk of flooding on Saturday.

Major Cities in Region: Pittsburgh, PA, Washington, DC, Philadelphia, PA, New York, NY

Excessive Rainfall Risk Outline for Saturday. July 29, 2017Excessive Rainfall Risk Outline for Saturday

A Look Ahead
There will be a risk for excessive rainfall on Sunday for portions of northern Florida ahead of a cold front. Rainfall amounts will range 1-2 inches with locally higher amounts in excess of 3 inches. Across the High Plains, thunderstorms may develop across the High Plains on Sunday. Gusty winds and hail will be the primary hazards with these storms. This risk will continue into Monday.

This is just a brief look at current weather hazards. We can provide you site-specific weather forecast information for the purpose of protecting your personnel and assets and to assess your weather risk. Try a 7-day demo right away and learn how timely precision weather information can enhance your bottom line.

Topics:Nowcast/Forecast

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