![]() ![]() If you want to calculate the pressure drop needed for a bomb cyclone, you take the sine of the latitude where the low pressure is located and divide it by the sine of 60 degrees (and you thought you would never use trigonometry). They added the term “bomb” because of the explosive power that these storms derive from rapid pressure drops (though Gyakum reportedly doesn’t use that word anymore because of its reference to weaponry). Sanders and Gyakum adjusted the ground rules to vary based on latitude. Its authors, MIT meteorologists Fred Sanders and John Gyakum, built upon work by Swedish meteorology researcher Tor Bergeron, who had initially defined “rapidly deepening” storms as those that met the 24 millibars-in-24 hours criterion.īut Bergeron was way up in Scandinavia, where storms strengthen much quicker because of the latitude (remember the Coriolis effect?) The term can be traced back to a meteorological research paper published in a 1980 edition of Monthly Weather Review. So, the millibar requirement can change depending on where the storm forms. However, that benchmark is also based on the latitude of the storm. Temperatures are forecast to plummet by as many as 60 degrees from earlier temps.īomb cyclone is a term given to a rapidly strengthening storm that fulfills one important criterion: Generally, pressure must drop 24 millibars (a unit of pressure) within 24 hours. Life-threatening cold: Denver's high temperature on Thursday is expected to stay below zero and likely will be its coldest day in over 30 years. That means the city experienced a drop of more than 75 degrees in terms of wind chill, which indicates what the wind feels like.Ĭheyenne also saw a 30-degree drop in temperature in 10 minutes and a record-breaking 43-degree temperature drop in one hour. local time to a temperature of -13 with a wind chill of -42 at 4:00 pm. In Wyoming, the capital city of Cheyenne went from 43 degrees with a wind chill of 35 at 1:05 p.m. ![]() A 24-degree drop in temperature was also recorded in seven minutes. Wind chill also fell to -30 degrees from 32 degrees during the same time frame.Ī 37-degree drop in temperature over one hour at Denver International Airport is preliminarily the biggest ever recorded at that location, according to the National Weather Service in Boulder. Temperatures in Denver plunged to -9 degrees Fahrenheit from 42 degrees on Wednesday afternoon into the evening. Record-breaking temperature drops are occurring in Colorado and Wyoming as a nationwide winter storm bears down. Warnings in effect: There is a blizzard warning and a wind chill warning for the Pennington County Plains, according to the National Weather Service. Motorists are taking shelter at the church in Wicksville," the sheriff’s office said, adding that about 65 people were at a warming shelter in nearby New Underwood. “More than 50 people are taking shelter in Wall. Officials are urging stranded motorists to stay in their vehicles and call 911. Warming shelters have been opened in the area, they said.Īn emergency operations center is also open in the county's administration building, according to the sheriff’s office. The goal is to get all stranded motorists to safety,” the Pennington County Sheriff’s Office said in a Facebook post Wednesday night. "Resources from Pennington County Highway Department, South Dakota Department of Transportation and area volunteer fire departments are tied up rescuing people along this stretch of road. More than 100 vehicles were stuck between Rapid City and the city of Wall roughly 50 miles east along Interstate 90, prompting a coordinated effort with the Pennington County Sheriff’s Office and the South Dakota Highway Patrol to help motorists. Read more about how different regions are impacted here:ĭozens of drivers were stranded on snow-covered roadways Wednesday in western South Dakota as a massive storm system delivers heavy snow to the region. The sudden arrival of these conditions can increase the danger,” the National Weather Service explained. Even small snow amounts, when combined with very strong wind gusts and plummeting temperatures, can cause poor visibility and slick spots on roads. “This is a case in which snow totals may not tell the whole story. Florida is at risk of seeing sudden temperature drops Friday. Many roads closed in Wyoming and northern Colorado due to poor visibility triggered by blowing snow, and dozens of vehicles were stranded in western South Dakota as drivers went through the nightmare of not being able to dig their cars out.Įven the South will not be spared: Nashville, Memphis, Birmingham and other metro areas are expected to see snow Thursday. (Karen Ducey/The Seattle Times/AP)Īreas accustomed to seeing heavy snow and brutal winters are experiencing intensified conditions with this storm. Rain turns to snow on pine trees during the morning hours in Lake Forest Park, Seattle on Tuesday.
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