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Dangerous heat spreads to Mid-Atlantic

Posted by feww on July 13, 2011

Heat Warnings/Advisories in Effect for Half the U.S. Population

Much of the Eastern, Southern and Mid-Section U.S. Experiencing Dangerous Heat

As oppressive heat gripped much of the eastern U.S. spreading into the Capital, triple-digit temperatures and heat indices hovered around the 115-degree mark, and air quality took a nosedive.

  • In Wichita, Kansas the temperature exceeded 100 degrees for the 20th consecutive day.
  • In Oklahoma City, Oklahoma, temperatures hovered around 100 degrees for the 14th consecutive day.

Heat Warnings and Advisories issued Monday for a large portion of the U.S. mid-section have been extended to the Mid-Atlantic states, as moist air from the Gulf of Mexico combined with dangerously high   “temperatures to perpetuate the dangerous heat illness threat across the South and East.” NWS said.

“Excessive Heat Warnings and Heat Advisories are in effect today from parts of Kansas, Oklahoma and Texas eastward across the Ohio and Tennessee Valleys and the Gulf States to the northern Eastern Seaboard and Mid-Atlantic. Triple digit high temperatures and high humidity are expected for the Nation’s Capital.”

U.S. Max Temp Forecast for July 13-14.

Max Heat Index and Probability Forecast – July 13, 2011

Image Source: NOAA/HPC. Click image to enlarge.

U.S. Weather Summary

  • Severe weather forecast for wide areas from the central High Plains across the Ohio and Tennessee Valleys into the Mid-Atlantic Coast.
  • Heavy rain over flooded river valleys across the northern and central Plains could exacerbate ongoing flooding.
  • Flash Flooding possible over parts of South Dakota, Nebraska, Utah and Colorado.

Weather Forecast Map July 12, 2011. Click to enlarge.

Air Quality

Air quality alerts are in effect in parts of Georgia, Maryland, New Jersey, North Carolina, Pennsylvania and Virginia, as of posting

Severe Weather

Severe weather extending from southeastern Wyoming to the Mid-Atlantic Coast, including parts of 14 states is possible today, NWS said.

“Parts of Wyoming, Colorado, Nebraska, Kansas, Iowa, Missouri, Illinois, Indiana, Kentucky, Tennessee, West Virginia, Virginia, North Carolina and South Carolina are at Slight Risk for severe weather. Another Slight Risk area covers most of Montana and the fringe area of north-central Idaho.”

Wednesday and Thursday Forecast: Parts of Montana, South Dakota, Wyoming, Colorado and Nebraska are also at Slight Risk for severe weather, NWS said.

SPC received 526 reports of severe weather on Monday: 474 reports of high winds and 52 reports of large hail. [Report was later filtered to 351/318/33.]

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