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Helping Business Weather the Storm

National Weather Summary for Friday, April 21, 2017

by David Moran, on Apr 21, 2017 10:57:31 AM

Severe thunderstorms are expected Friday across portions of the Southern Plains as a warm front lifts northward. A stalled front from the Ozarks to the Mid Atlantic will be the focus for some strong to severe thunderstorms Friday. This same front will allow for the potential for excessive rainfall and flash flooding Friday across the Ozarks.

  • Severe Thunderstorms Expected Friday across the Southern Plains
  • Strong to Severe Thunderstorms Possible from the Mississippi Valley into the Mid Atlantic on Friday
  • Excessive Rainfall Risk for the Ozarks on Friday
  • Thunderstorm Potential for Lower Mississippi River into Mid Atlantic on Saturday
  • Excessive Rainfall Potential Saturday for the Tennessee Valley
  • Potential for Thunderstorms across the Southeast on Sunday

US Hazards Friday, April 21, 2017US Hazards

Severe Thunderstorms Expected Friday across the Southern Plains
A southeastward moving line of thunderstorms currently approaching the OKC metro area will continue progressing through the morning and early afternoon hours, bringing the potential for severe hail and damaging wind gusts. Then, into the mid-afternoon and evening hours, additional thunderstorms will develop and build southward towards the DFW area, allowing for an increase in tornado potential, along with the attendant hail and wind risk. This enhanced tornado, hail, and wind risk is then expected through around midnight or so, where the risk should then lessen thereafter as conditions become more stable.

Update 11:57am CDT: Squall line continues to move across eastern Oklahoma. Damaging winds will be the primary hazard.

Radar 11:57am CDT 4/21/17Radar 11:57am CDT

Major Cities in Region: Oklahoma City, OK, Dallas, TX, Tulsa, OK, Fort Smith, AR, Little Rock, AR, Jonesboro, AR

Region 1 Friday, April 21, 2017Region 1

Strong to Severe Thunderstorms Possible from the Mississippi Valley into the Mid Atlantic on Friday
Scattered thunderstorm development is forecast this afternoon along a cold front draped from the Mid-Atlantic through the Mid-South region. Clusters of storms and some individual supercells will be possible, with damaging winds and a few areas of hail as the main risks.

Update 1:21pm EDT: Severe thunderstorms capable of large hail and damaging winds north of Knoxville, TN.

 Radar 1:21pm EDT 4/21/17Radar 1:21pm EDT

Update 2:47pm EDT: Severe thunderstorm southeast of Nashville capable of large hail and damaging winds.

Radar 2:47pm EDT 4/21/17Radar 2:47pm EDT

Major Cities in Region: Memphis, TN, Nashville, TN, Knoxville, TN, Raleigh, NC, Richmond, VA, Washington, DC, Baltimore, MD, Philadelphia, PA

region2-133.pngRegion 2

Excessive Rainfall Risk for the Ozarks on Friday
Showers and thunderstorms will impact the Ozarks for much of the day and evening on Friday as a frontal boundary stalls. Some of this activity may produce very heavy rain at times, with rainfall totals of 2 inches being common. Locally higher totals in excess of 4 inches will be possible, leading to the potential for flash flooding.

Major Cities in Region: Tulsa, OK, Fayetteville, AR, Joplin, MO, Springfield, MO, Jonesboro, AR

Excessive Rainfall Risk Outline for Friday, April 21, 2017Excessive Rainfall Risk Outline for Friday

Thunderstorm Potential for Lower Mississippi River into Mid Atlantic on Saturday
An area of low pressure will continue to track into the Mississippi Valley on Saturday into the Gulf Coast ahead of an advancing cold front. Scattered thunderstorms will develop during the afternoon, with large hail and damaging winds the primary hazards with any storms that develop. The potential for strong to severe thunderstorms will return to the Mid Atlantic as a front stalls across the region. Scattered showers and thunderstorms will develop during the afternoon, posing a risk for strong winds. This activity will diminish by early evening.

Major Cities in Region: Baton Rouge, LA, Memphis, TN, Jackson, MS, Nashville, TN, Birmingham, AL, Knoxville, TN, Charlotte, NC, Raleigh, NC

SPC Convective Outlook for Saturday, April 22, 2017SPC Convective Outlook for Saturday

Excessive Rainfall Potential Saturday for the Tennessee Valley
Moderate to heavy rainfall will be persistent across the Tennessee Valley for much of the day and evening on Saturday as an area of low pressure tracks through the region. Rainfall amounts of 1-2 inches with isolated higher amounts in excess of 3 inches will be possible from northern Tennessee into eastern Kentucky and the Appalachians. This will likely lead to local runoff issues.

Major Cities in Region: Knoxville, TN

Excessive Rainfall Risk Outline for Saturday, April 22, 2017Excessive Rainfall Risk Outline for Friday

Potential for Thunderstorms across the Southeast on Sunday
There will be a chance for severe weather on Sunday across the Southeast, mainly along the Southeast Coast and all of Florida. Strong to severe thunderstorms are expected to develop by the afternoon ahead of an area of low pressure. Scattered to widespread showers and thunderstorms will develop across the region with large hail, damaging winds, and an isolated tornado all potential hazards.

Major Cities in Region: Atlanta, GA, Tampa, FL, Orlando, FL, Jacksonville, FL, Miami, FL, Raleigh, NC, Savannah, GA

SPC Convective Outlook for Sunday, April 23, 2017SPC Convective Outlook for Sunday

A Look Ahead
An area of low pressure moving into the Northern Plains Monday, may allow for the development of showers and thunderstorms. At this time, no severe weather is expected. Elsewhere, showers and thunderstorms are forecast across the Mid Atlantic and Northeast Tuesday into Wednesday.

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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