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Posts Tagged ‘Arctic front’

Historic Cold Continues across Eastern U.S.

Posted by feww on February 19, 2015

Dangerously low temperatures affecting much of the eastern U.S.

Historic cold with dangerously low temperatures impacting much of the eastern half of the U.S., with many locations experiencing temperatures as low as 45 degrees below average, and some records threatened, said the National Weather Service (NWS).

A massive surge of arctic air later this week will impact most of the U.S., as another cold front slides south from Canada, said NWS.

“There are indications that this could be some of the coldest weather since the mid-1990s for some parts of the Southeast U.S., Mid-Atlantic, and central Appalachians. An eddy of the polar vortex will add to the potency of the surface cold front, thus creating a deep layer of bitterly cold air. Highs on Thursday and Friday will struggle to get out of the teens for many of these areas, and overnight lows could reach zero degrees or even lower in some places! Wind chill advisories and warnings are currently in effect. The overnight lows on Thursday night will be the coldest in those areas where the wind goes calm, allowing for additional
radiational cooling.”

  • Historic cold impacting eastern U.S. through Friday.
  • Another storm system developing over the southern U.S.
  • Dangerous wind chills are forecast from the northern Plains to the Gulf Coast.
  • Temperatures will be as low as 45 degrees below average for much of region.
  • Heavy snow is forecast for parts of Northern New England.
  • Rain/freezing rain and sleet could affect parts of the Lower/Middle
    Mississippi Valley/Tennessee Valley.

min temp us 48
Low temperature ending February 19, 2015 (NWS).

National High and Low Temperature (for the contiguous United States)
Issued 7 am EST Thursday, February 19, 2015

High Temperature for Wednesday, February 18, 2015
29.4ºC (85 degrees F) at Thermal, CA

Low Temperature for Thursday, February 19, 2015
-40.5ºC (-41 degrees F) at Embarrass, MN
NWS Weather Prediction Center, College Park, MD

[Temperature spread: 70ºC (126 degrees F), as calculated by FIRE-EARTH]

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Major Winter Storm Battering Southern Plains through Ohio Valley

Posted by feww on December 6, 2013

EXTREME WEATHER EVENTS

TEXAS Declares State of Disaster

Arkansas, Missouri, Oklahoma and Tennessee Declare States of Emergency ahead of Ice Storm

Minnesota Declares Snow Emergency in Minneapolis and St. Paul. Other cities that have also proclaimed emergencies, include Crystal, West St. Paul, Plymouth, St. Paul, Robbinsdale, Mendota Heights, Bloomington, Minneapolis and St. Louis Park.

Arctic airmass engulfing the West and Central U.S. with temperatures as much as 30ºC below normal

A major ice storm is expected through Friday Central Texas to the Ohio Valley. The storm system will also bring heavy  snowfall expected from Oklahoma to Lower Great Lakes, and possibly heavy rain from the central Appalachians to the lower Mississippi Valley. Prolonged power outages could occur across the region. —NWS

Hundreds of schools and thousands of businesses have closed as heavy snow and ice blanketed roads and power lines across a wide swath of the United States.

Arkansas, Missouri, Oklahoma and Texas are forecast to be the hardest hit by the major storm system, said the National Weather Service (NWS).

The snowstorm has contributed to hundreds of traffic accidents around the state, including at least five fatal crashes between Monday and Wednesday, AP reported.

us composite 03-30-12-6-2013
Near Real-Time U.S. Composite Satellite Image. Recorded at 03:30UTC on December 6, 2013. (Source: SSEC/Wisc-Uni)

Highlights of Latest NWS Forecast

  • Major ice storm expected from the Central Texas to the Ohio Valley.
  • Heavy snowfall expected from Oklahoma to Lower Great Lakes.
  • A classic ice storm pattern is taking shape from the Southern Plains tothe Ohio Valley.
  • prolonged period of freezing rain and sleet from central Texas to the Ohio valley.
  • Arctic airmass overspreading the West and Central U.S. with temperatures as much as 30 degrees Celsius [54ºF] below normal.
  • Snowfall will be possible even within coastal Washington and Oregon
  • The latest Arctic invasion follows a massive storm that dumped up to 22 inches (56cm) of snow in portions of Minnesota earlier this week.
  • Up to 8 inches of snow is forecast for Missouri Thursday night through Friday.
  •  Albany, New York, St. Louis and Pittsburgh could also receive  up to 6 inches of snow, forecasters  said.
  • Arctic blast that threatens up to 50 million people in the South and the Midwest with snow, ice and super-chilled temperatures, plummeting by as much as 30 degrees Celsius [54ºF.]

In wake of the cold front pushing through the eastern U.S., a very cold airmass will overspread the central and western U.S. Temperatures will be 10 to 30 degrees below normal for the next few days. High temperatures will remain below zero for some parts of the northern Plains. A reinforcing shot of cold air will arrive in the Pacific Northwest toward the end of the period. Snowfall will be possible even within coastal Washington and Oregon. —NWS

us weather hazmap 6dec2013
U.S. Weather Hazards Map (Hazmap)  for Friday, December 6, 2013. Source and Update: NWS/CRH. Hazmap enhanced by FIRE-EARTH Blog.

Text of Disaster Declaration in Texas

I, RICK PERRY, Governor of the State of Texas, do hereby certify that a significant winter storm poses a threat of imminent disaster in the following counties: Andrews, Archer, Armstrong, Bailey, Baylor, Bell, Blanco, Borden, Bosque, Bowie, Briscoe, Brown, Burnet, Callahan, Carson, Castro, Childress, Clay, Cochran, Coke, Coleman, Collin, Collingsworth, Comanche, Concho, Cooke, Coryell, Cottle, Crockett, Crosby, Dallam, Dallas, Dawson, Deaf Smith, Delta, Denton, Dickens, Donley, Eastland, Ector, Ellis, Erath, Falls, Fannin, Fisher, Floyd, Foard, Franklin, Gaines, Garza, Gillespie, Glasscock, Grayson, Gray, Hale, Hall, Hamilton, Hansford, Hardeman, Hartley, Haskell, Hemphill, Henderson, Hill, Hockley, Hood, Hopkins, Howard, Hunt, Hutchinson, Irion, Jack, Johnson, Jones, Kaufman, Kent, Kerr, Kimble, King, Knox, Lamar, Lamb, Lampasas, Limestone, Lipscomb, Llano, Lubbock, Lynn, Martin, Mason, McCulloch, McLennan, Menard, Midland, Mills, Mitchell, Montague, Moore, Motley, Navarro, Nolan, Ochiltree, Oldham, Palo Pinto, Parker, Parmer, Potter, Rains, Randall, Reagan, Red River, Roberts, Rockwall, Runnels, San Saba, Schleicher, Scurry, Shackelford, Sherman, Somervell, Stephens, Sterling, Stonewall, Sutton, Swisher, Tarrant, Taylor, Terry, Throckmorton, Titus, Tom Green, Travis, Upton, Van Zandt, Wheeler, Wichita, Wilbarger, Williamson, Winkler, Wise, Wood, Yoakum, and Young.

THEREFORE, in accordance with the authority vested in me by Section 418.014 of the Texas Government Code, I do hereby declare a state of disaster in the counties listed above based on the existence of such threat, and direct that all necessary measures, both public and private as authorized under Section 418.017 of the code, be implemented to meet that threat.

As provided in Section 418.016, all rules and regulations that may inhibit or prevent prompt response to this threat are suspended for the duration of the incident.

In accordance with the statutory requirements, copies of this proclamation shall be filed with the applicable authorities.

IN TESTIMONY WHEREOF, I have hereunto signed my name and have officially caused the Seal of State to be affixed at my office in the City of Austin, Texas, this the 5th day of December, 2013.

RICK PERRY
Governor of Texas

Recent Extreme Weather Events

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Major Winter Storm Affecting Much of the U.S.

Posted by feww on December 5, 2013

EXTREME WEATHER EVENTS

POWERFUL WINTER STORM has engulfed much of the U.S. as a major icing event looms

Multiple warnings are in effect for extreme weather as a powerful storm system ploughs across the country dumping massive snow and plunging temperatures to dangerously low values.

Portions of Minnesota have already reported up to 2 feet of snow, more snow expected.The snowstorm has contributed to hundreds of traffic accidents around the state, including at least five fatal crashes between Monday and Wednesday.

The Warnings, Watches and Advisories include Ice Storm Warning, Winter Storm Warning, High Wind Warning, Avalanche Warning, Flood Warning, Gale Warning, Wind Chill Warning, Hard Freeze Warning, Freeze Warning, Hazardous Weather Outlook, Freezing Rain Advisory, Winter Storm Watch, Freeze Watch, Special Weather Statement, Air Quality Alert and many others.

Extreme Weather Highlights

  • Major icing event is forecast across the Arklatex and into southern Missouri and Illinois from noon Thursday.
  • Heavy snow and icing will continue to impact the Upper Midwest and Upper Great Lakes.
  • Arctic intrusion will plunge temperatures by as much as 35 degrees below normal to much of the western/central states.
  • Portions of Minnesota have already reported up to 2 feet of snow, more snow expected.
    • The snowstorm  has contributed to hundreds of traffic accidents around the state, including at least five fatal crashes between  Monday and Wednesday, AP reported.
  • Up to half inch of ice accumulations could hit a large region from northeastern Texas through the Ozarks and into southeastern Missouri.
  • Hard freeze warnings are in effect for much of the Central Valley in California, as well as southern Nevada and NW Arizona, and cities such as San Diego will experience near record low temperatures.

Minnesota Plagued by Unrelenting Snowstorm


An unrelenting storm that has spread about 2 feet of snow in northeastern Minnesota continued for a third day Wednesday. It has contributed to hundreds of traffic accidents around the state, including at least five fatal crashes since Monday. (AP- December 4, 2013

The Arctic Element

Cold air is plunging into the Western and Central U.S., and heavy snow continues across the Northern Plains and Great Lakes, as the system moves east and south. The Arctic intrusion has brought temperatures to dangerously low values, especially across the Northern Rockies and Northern Plains, with forecast highs in the negative single digits while lows plunge into the -20s Fahrenheit through Saturday. The freezing wind will lower the apparent/wind chill temperatures to the -30s over parts of Montana and North Dakota …. creating temperature contrast along the Arctic front with the northern tier plagued by the frigid readings, while the mercury moving from upper 70s to lower 80s along the Gulf Coast. —NWS Forecast [edited by FIRE-EARTH for brevity.]

us weather hazmap 5dec2013
U.S. Weather Hazards Map (Hazmap)  for Thursday, December 5, 2013. Source and Update: NWS/CRH. Map enhanced by FIRE-EARTH Blog.

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Massive Winter Storm Engulfs Much of Western, Central and Northern U.S.

Posted by feww on December 4, 2013

EXTREME WEATHER EVENTS

POWERFUL WINTER STORM battering much of Western, Central & Northern U.S. with high winds and heavy Snow

High winds and heavy snow forcing temperatures to plunge as much as 35 degrees below normal across much of the Western and North Central U.S., causing  dangerous wind chills.

Multiple Hazardous Weather Warnings, as well as Watches and Advisories, are in effect across the country. The warnings include Winter Storm Warnings, High Wind Warnings, Flood Warnings, Gale Warnings, Wind Chill Warnings, Hard Freeze Warnings and Freeze Warnings.

  • Hard Freeze Warnings are in effect for California, said the National Weather Service (NWS).
  • Heavy snow is forecast across the Wasatch, Colorado Rockies, and San Juans through Thursday morning.
  • Significant snow accumulations are expected over the Northern Plains, Upper Midwest, and Great Lakes region.

us weather hazmap 4dec2013

Storm Total Snowfall 5:00am MST Sat Nov30 through 1:00pm MST Tue Dec 03

Idaho-Gibbonsville: 30.0 in (76.2cm)
Michigan- Mancelona: 3.5
Minnesota- Two Harbors: 22.0
Montana- Evaro: 20.0
North Dakota- Buffalo: 8.0
Nevada- Sparks: 8.5
Oregon- Flora: 9.5
South Dakota- Red Owl: 10.8
Washington- Wenatchee: 7.0
Wisconsin- Superior: 8.0
Wyoming- Bondurant: 25.0

Selected Peak Wind Gusts (MPH) Earlier In The Event
California- Independence: 59 MPH
Colorado- Pikes Peak: 81 MPH (130km/h)
Idaho- Roberts: 59
Nebraska- Kimball: 50
Wyoming- Arlington : 66

Selected Storm Total Rainfall (inches) Where The Event Has Ended

Idaho- Moose Creek Raws: 3.14 (in)
Oregon- Blazed Alder Snotel: 9.30
Washington- June Lake Snotel: 5.90

NWS Forecast

As Arctic air continues to push southward over the next couple days, the low pressure center in southern Iowa is forecast to intensify on Wednesday and then quickly move into the upper Midwest by Wednesday night. This storm will continue bringing heavy snow, gusty winds, and dangerous wind chills to the Northern Plains and upper Midwest on Wednesday. Additional snow accumulations are expected to range from 6 to 12 inches with up to 15 more inches possible in the upper Great Lakes. As the Arctic front pushes further southward into the central Rockies, additional snowfall totals will range from 4 to 10 inches with upwards of 12 to 18 inches for the highest elevations. Freezing rain accumulations up to a quarter of an inch are possible across portions of the upper Midwest and upper Great Lakes tonight and into tomorrow. In addition, this same system could produce a quarter to more than half an inch of ice across portions of Southern Plains into the lower Ohio Valley later this week.

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