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2012 North American heat wave

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Map of land surface temperature anomalies for June 17–24, 2012. The map depicts temperatures compared to the 2000–2011 average for the same eight day period in June. (Land surface temperatures (LST) are distinct from the air temperatures that meteorological stations typically measure.)

The summer 2012 North American heat wave is a heat wave which has led to more than 82 heat-related deaths across the United States and Canada.[1][2] An additional twenty-two lives were lost in the resultant June 2012 North American derecho. This long-lived, straight-line wind and its thunderstorms cut electrical power to 3.7 million customers.[3] Over 500,000 were still without power on July 6, as the heat wave continued.[4] Temperatures generally decreased somewhat the week of July 9 in the east,[5] but the high pressure shifted to the west, causing the core of the hot weather to the build in the Mountain States and the southwest U. S. shifting eastwards again by mid-July[6][7]

Cause

High pressure aloft traps heat near the ground, forming a heat wave

The heat wave formed when high pressure aloft over the Baja of Mexico strengthened and moved over the southern plains around June 20-23 and then spread east and northward, remaining fixed over the center of North America.[8][9]

The heat is due to the fact that, under high pressure, the air subsides (sinks) toward the surface. This sinking air acts as a dome capping the atmosphere. This cap helps to trap heat instead of allowing it to lift. Without the lift there is little or no convection and therefore little or no convective clouds (cumulus clouds) with minimal chances for rain. The end result is a continual build-up of heat at the surface resulting in drought conditions over wide areas.[10]

Although it is not definitively possible to say that global warming caused any specific weather event, there is a strong correlation between the increased frequency of events like this affecting continental climate zones and observations of climate change. [11][12][13]

Timeline of impacts

Beginning of Heat Wave

The intense heat wave in the West was initiated around June 20-23 when the high pressure system centered over the Baja of California shifted upward into the plains and caused temperatures to approach or even surpass 110 degrees for the next several days, breaking many records for the area.

The heat spread east from the Rocky Mountains and a massive high-pressure system over the Midwest caused extreme temperatures not seen on such a scale since the 1930s.[14] On June 25, 2012, Denver, Colorado tied its all-time high with a temperature of 105°F (40.5°C). On the same day a couple of 113°F (45°C) readings were recorded in Kansas. The heat was so strong that Alamosa, Colorado broke their daily records for six consecutive days. In Galveston, Texas, the earliest 100°F (38°C) day ever was recorded.[15]

Hill City, Kansas was the warmest point in the United States on June 26, with the thermometer climbing to 115°F (46.1°C).[16]

Thousands of records were again broken on June 28. Fort Wayne, Indiana tied its all-time record high with 106°F (41.1°C) while Indianapolis broke its monthly record at 104°F (40°C). More monthly records that day included St. Louis, Missouri at 108°F (42.2°C) and Little Rock, Arkansas at 107°F (41.7°C).[17]

The heat resulted in two boys from Bradley County, Tennessee dying of hyperthermia.[18]

In the Deep South, from June 28 through June 30, many notable temperature extremes occurred. In Paducah, Kentucky, June 29 witnessed an all time official record of 108 °F (42.2 °C). In Bowling Green, Kentucky, the same day witnessed 109 °F (42.8 °C), one degree short of the state's all-time record for June. Perhaps more remarkable, Tennessee observed a handful of all-time record highs. Nashville reached 109 °F (42.8 °C) on June 29, two degrees higher than the previous record. Chattanooga reached 107 °F (41.7 °C), an all-time high, on both June 30 and July 1. And, although not officially verified by the National Weather Service at this time, Smyrna, Tennessee recorded a reading of 113 °F (45.0 °C) on the 29th, which would in fact be the highest recorded temperature in the state.[19]

In Northern Canada, Fort Good Hope, Northwest Territories, located at the Arctic Circle, had a streak of five consecutive days above 30°C (86°F) from June 21 to June 25 peaking at 35°C (95°F, quite possibly the longest heat wave in Canada at that time.[20] Further south, on June 19, 20 and 21, Toronto experienced its first official early season heat wave (In Canada, a heat wave is defined as three or more consecutive days with temperatures at or above 90°F (32°C)), with temperatures ranging between 92.1°F (33.4°C) and 94.1°F (34.5°C) and the minimum temperature on June 20 not dropping below 75.9°F (24.4°C).[20] On both July 4 and July 6, Toronto reached 36.3°C (97.3°F)[20] and on July 17, the city hit 36.8°C (98.3°F),[20] making this the hottest day of the year so far in the city and the 5th record daily high of this summer.

Spread to Southeastern U.S.

The high pressure ridge continued to slide eastward and centered itself over Tennessee, causing hundreds of records to be matched or surpassed for multiple states, including Illinois, Indiana, Kentucky, Georgia, North Carolina, and Wash. D.C., among others.

The scorching heat continued on June 29 when Washington, D.C. and Atlanta, Georgia recorded their highest June temperature ever at 104°F (40°C). Charlotte, North Carolina and Raleigh, North Carolina were warm enough to tie the all-time record at 104°F (40°C) and 105°F (40.6°C) respectively.[21]

The Mid-Atlantic States did not escape the heat. On June 29 and June 30, Salisbury, Maryland recorded a monthly record high of 101 °F (38.3 °C). Baltimore reached 103 °F (39.4 °C) on June 29, setting a similar month of June record. Interestingly, on July 18, Baltimore reached 104 °F (40.0 °C), although not shattering the monthly record; only the daily record broken.[22]

New England and Midwest

While still affecting the Southeastern and Great Plains regions of the U.S., the heat wave continued to spread northward into the New England area around July 7th and 8th, leading to temperatures surpassing 90 degrees F.

Chicago's O'Hare International Airport tied its all-time 4th of July record of 102°F (38.89°C) which was set back in 1912. Not far from O'Hare, the official measuring station for the city of Chicago, the villages of Park Ridge, Niles, Norridge as well as much of the Chicago metropolitan area recorded a temperature of 104°F (40°C). Some places north of Chicago got even hotter. Caledonia, Wisconsin, just south of Milwaukee, Wisconsin reached 107°F. Actual air temperatures were close to 110°F in and around the city of Allegan, Michigan. St. Louis endured a string of ten straight days with temperatures above 100 °F, ending on July 7.[23] Three deaths in St. Louis have been attributed to the heat.[24]

As of July 6, Chicago has had four official 100 °F (38 °C) or higher temperature readings, one on June 28, along with three in July, culminating with an official near-record shattering high of 103 °F (39 °C) at O'Hare on consecutive days of July 5 and 6. Much like on the 4th of July, temperatures were much higher in Park Ridge and in much of the metropolitan area of Chicago on the 5th of July, with highs reaching 105 °F (40.6 °C) and 106 °F (41.1 °C) in some areas. On July 7 the temperature at O'Hare International Airport reached 98°F shortly before 11 AM, but much of the Chicago metro area west and south of the airport reached or exceeded 100 degrees, marking the fourth consecutive day of 100-degree heat in the wider Chicagoland area. The city proper tied the old record of three consecutive 100-degree days which was set back in August 1947. These temperatures are extremely unusual for the city and the surrounding area. Normally, the highest temperature recorded in a typical Chicago summer is around 95 °F (35 °C), a streak of 3 days above 90 °F (32 °C) constitutes a "heat wave", and the thermometer reaches or surpasses 100 °F (38 °C) only once every five to ten years. The Chicago temperatures exceeded the 1995 Chicago heat wave, which claimed over 750 lives, although humidity and dew points were higher duing that heat wave.[25] Through the first five days of July, the mean temperature in Chicago averaged 86.4 °F (30.2 °C), 13.2 °F (7 °C) above normal, the hottest since 1911.[26] Two deaths are confirmed so far from the heat in Cook County, and two other lives were lost in a train derailment blamed on the heat.[27] An additional death in Rock County, Wisconsin has been noted.[28]

The heat caused highways to buckle in Illinois, North Carolina and Wisconsin.[29][30]

After a brief respite from the extreme heat, the Mid-Atlantic States resumed observation of record highs by the end of the first week of July. Maryland has been particularly hard-hit, with eight deaths so far, including four on July 5.[31] Cumberland, Maryland recorded a monthly record of 104 °F (40.0 °C) on July 8. Bremo Bluff, Virginia recorded an astounding 109 °F (43 °C), which is an all-time-record high on July 8. [32]

The Northeastern United States suffered the worst of this heat wave during two time perioids: July 7 & 8. Even normally cool plateau regions experienced highs in the 90s F. Laurel Mountain, Pennsylvania, near Johnstown, Pennsylvania, reached 95 °F (35.0 °C) on the 8th, beating the previous all-time-record high by 2°F (1°C). Similarly, on July 7, daily record highs were all broken in Harrisburg, Pennsylvania, Lancaster, Pennsylvania, and Chambersburg, Pennsylvania. They each reached 101 °F (38.3 °C). Interestingly, the previous year, Newark, New Jersey reached 108 °F (42.2 °C), the highest temperature ever recorded there. [33]

On July 8, the high pressure shifted to the west, causing hot weather in the mountain states and the southwest U. S.[6][7][34]

Heat Continues in Great Plains

After some modification in the heat during the past week, the jet will once again move further north into Canada allowing intense heat to build across eastern North America. On July 15, Temperatures reached 109 °F (42.8 °C) in Pierre, South Dakota.

On July 17, the temperature at Detroit, Michigan Metro Airport climbed to 102 °F (38.9 °C), the third plus 100 degree day thus far in July. The average July maximum temperature is 83 °F (28.3 °C).

The Northeastern states also experienced a second round of heat, with temps again returning to the 90's. Atlantic City, New Jersey reached 101 °F (38.3 °C) on July 18, a daily record high. The same day, Newark, New Jersey reached 104 °F (40.0 °C), a daily record. [32] Teterboro Airport, NJ recorded a monthly record high of 103 °F (39.4 °C). Triple-Digit Temperatures even reached Hartford, Connecticut, where, on July 18, the city reached 100 °F (37.8 °C), which was a monthly record high. [32]

As of July 25, St. Louis, Missouri endured its 16th straight day of plus 100 °F (37.8 °C) heat with 27 of the past 28 days exceeding this temperature, with 90s forecast over the next few days. 24 deaths have been attributed to the heat in St. Louis metro area [35]

Other Impacts

Wildfires raged across the western United States during the time of the heat wave, in part attributable to the dry conditions caused by the heat. The Waldo Canyon fire in Colorado attracted the most attention after spreading into Colorado Springs and charring hundreds of homes, but large wildfires also burned throughout Utah, Wyoming, Montana, New Mexico, Arizona and Idaho.[11]

The heatwave has also contributed to the record-shattering 2012 North American drought, which has caused massive crop failures throughout the Midwest and most likely will cause food prices to rise. This drought affects 80% of the contiguous US as of July 24, and is considered the worst drought since the 1950's.[36]

Severe Storms

Main article: Summer heat wave of 2012 derecho series
Composite radar image as the June 2012 North American derecho moved from Indiana to Virginia.

On June 29–30, 2012, The heat and humidity from the heat wave caused a small thunderstorm in Iowa to develop into a violent and unprecedented derecho, which tracked across the Midwest and Mid-Atlantic regions of the United States while causing 80 MPH or higher winds, doing hundreds of millions of dollars in damage, and downing trees and power lines, leaving four million people in the eastern U. S. without power.[37]

On July 26, 2012, the heat wave contributed to the formation of a multi-bow serial derecho in the Midwest and Northeast.

The heatwave outbreaks may continue to cause significant derechos or possibly tornado outbreaks anywhere in the midwestern United States, the Great Lakes region and southern Canada similar to the 1995, 1999 and 2006 derechos. Parts of west-central Ohio were affected by 3 derechos within 4 weeks. This area, on average, only suffers one derecho strike per year.

See also

References

  1. ^ Associated Press (2012-06-30). "Americans get relief from heat, but severe storms loom". msnbc.msn.com. Retrieved 2012-07-07.
  2. ^ Bruce Schreiner, Roxana Hegeman, and Seth Borenstein (2012-06-28). "Nation bakes as serious heat wave hits early". Yahoo! News. Retrieved 2012-07-07.{{cite web}}: CS1 maint: multiple names: authors list (link)
  3. ^ Ian Simpson (2012-06-30). "Storms leave 3.4 million without power in eastern U.S." Chicago Tribune. Reuters. Retrieved 2012-06-30.
  4. ^ "Over 115 million bake in heat, with more scorching temps to come". CNN.com. Retrieved 2012-07-07.
  5. ^ Associated Press (9 July 2012). "US to get a reprieve from hot temperatures". The Wall Street Journal. Retrieved 30 July 2012. {{cite news}}: Italic or bold markup not allowed in: |publisher= (help)
  6. ^ a b Nelson, Laura J. (2012-07-07). "Heat relief is on way for East, Midwest, as high temps shift west". latimes.com. Retrieved 2012-07-30.
  7. ^ a b "U.S. News | National News - Latest Headlines, Videos, Photos - ABC News". Abcnews.go.com. 2006-05-04. Retrieved 2012-07-30. [dead link]
  8. ^ "Record-setting heat wave could break soon for millions â€"". Usatoday.com. Retrieved 2012-07-30.
  9. ^ Burt, Christopher. "The Amazing June Heat Wave of 2012. Part 1: The West and Plains June 23-27". wunderground.com. Retrieved 26 July 2012.
  10. ^ "Heat Index". US National Weather Service.
  11. ^ a b "NASA Maps Heat Wave Fueling Wildfires in the Rockies". NASA. Retrieved 2012-07-07.
  12. ^ "Has global warming brought an early summer to the US?". New Scientist. 28 March 2012. Retrieved 30 July 2012. {{cite news}}: Italic or bold markup not allowed in: |publisher= (help)
  13. ^ http://www1.ncdc.noaa.gov/pub/data/cmb/bams-sotc/2011-peterson-et-al.pdf
  14. ^ Murphy, Kevin (2012-06-28). "Extreme heat spreads across U.S., breaks records - Yahoo! News". Yahoo! News. Retrieved 2012-07-07.
  15. ^ "All-Time Record Highs Fall in Colorado, Kansas, Nebraska". Accuweather. Retrieved 2012-07-07.
  16. ^ Associated Press (2012-06-27). "Hill City high temperature hits 115 again Wednesday". The Kansas City Star. Retrieved 2012-07-07.
  17. ^ "STORM2K - RECORD HIGHS JUNE 2012". Storm2k.org. Retrieved 2012-07-07.
  18. ^ "Heat Caused Death Of Two Young Boys In Bradley County - 07/06/2012". Chattanoogan.com. 2012-06-07. Retrieved 2012-07-07.
  19. ^ Burt, Christopher (2012-07-01). "The Amazing June Heat Wave of 2012 Part 2: The Midwest and Southeast June 28-30". wunderground.com. Retrieved 2012-07-21.
  20. ^ a b c d "Daily Data | Canada's National Climate Archive". Climate.weatheroffice.gc.ca. 29 May 2012. Retrieved 7 July 2012.
  21. ^ Samenow, Jason (2012-06-29). "Washington, D.C. shatters all-time June record high, sizzles to 104 - Capital Weather Gang". The Washington Post. Retrieved 2012-07-07.
  22. ^ "NCDC Record Extremes". wunderground.com. Retrieved 2012-07-21.
  23. ^ "Streak of 100-degree weather in St. Louis area hits five days". StLToday.com. 2012-07-03. Retrieved 2012-07-07.
  24. ^ "Midwest Can't Get Any Relief from Oppressive Heat". weather.com. Retrieved 2012-07-07.
  25. ^ "Tim's Weather World: Is this heat wave Chicago's worst - Chicago Weather Center". Blog.chicagoweathercenter.com. July 6, 2012. Retrieved 2012-07-07.
  26. ^ "Oppressive heat spills into Friday with the hottest temps since Chicago's deadly July 12-16, 1995 heat wave 17 years ago - Chicago Weather Center". Blog.chicagoweathercenter.com. July 6, 2012. Retrieved 2012-07-07.
  27. ^ "Intense heat in Chicago a factor in two deaths, many disruptions". Chicago Tribune. Retrieved 2012-07-07.
  28. ^ "Heat related death noted in Rock County". Beloit Daily News. Retrieved 2012-07-07.
  29. ^ Temperatures across US cool slightly but still hot July 8, 2012
  30. ^ Kesling, Ben (2012-07-09). "Unwavering Heat Wave Grips U.S. - WSJ.com". Online.wsj.com. Retrieved 2012-07-30.
  31. ^ "Update: Heat-Related Deaths Rise To 9 In Md". WUSA (TV). 6 July 2012. Retrieved 2012-07-07.
  32. ^ a b c "NCDC Record Extremes". Retrieved 2012-07-21.
  33. ^ "Wunderground U.S. Records". Retrieved 2012-07-21.
  34. ^ "Heat's impact hits roads, thermostats". WRAL.com. 2012-06-29. Retrieved 2012-07-30.
  35. ^ "Cooler weather could bring relief to St. Louis-area consumers hit hard by utility bills". Stltoday. 2012-07-26. Retrieved 2012-07-30.
  36. ^ Suhr, Jim (17 July 2012). "U.S. drought worst since mid-'50s". The Seattle Times. Retrieved 26 July 2012.
  37. ^ Associated Press (30 June 2012). "East Coast storms kill 13, cause wide power outages". Newsday.com. Retrieved 2012-07-07.

External links

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