Coatings Of Snow Drag Temperatures
February 10, 2012, 6:04 PM
The National Weather Service in Sioux Falls has been tracking temperatures when snow is on the ground since at least 1940. That data helps us forecast after snow ends.
By February, the average high temperatures are just starting to climb. The 30-year normal is 30 degrees for the next few days. But when no snow was on the ground, our average temperature was around 42.
The winds helped keep us from even approaching that number Friday.
When you start adding snow into the calculations, the numbers don't move much from the average. That shows days with snow cover are much more common, and our typical day reflects that. More than six inches of snow drops the highs around 10 degrees.
The numbers get a little cooler at night. Light snow usually keeps us around normal and rarer lingering heavy snow cuts at least ten degrees off already cold numbers.
Arctic air and pre-existing snow work in concert making bitter temperatures last. The cold air keeps snow from melting and snow keeps the ground-level air from warming. It's a good thing we had last week's melt-off otherwise we'd easily bottom out in the teens below zero.
We won't be that cold Friday evening. Regardless, neither comes close to the record lows for Friday evening: 27 below in Aberdeen and 35 below in Sioux Falls.
© 2012 KELOLAND TV. All Rights Reserved.
5/18/2013 4:55 PM
A Severe Thunderstorm Watch is already out for most of western South Dakota. That goes (for now) until 10:00 p.m. MDT but could be extended east...
5/17/2013 10:04 PM
Some spots in KELOLAND saw more than an inch of rain Thursday night and more is on the way.
5/18/2013 7:30 AM
Plenty of wet weather is left from last night’s storm complex. We didn’t receive any reports of damage across the region, despite se...
5/19/2013 8:31 AM
A closed low pressure system will drift around our region for the next few days, leaving heavy rain and wind behind. There is also another round...
5/19/2013 5:27 PM
There is still a risk of severe weather this evening and tonight. This threat is mainly for SW Minnesota. We have a Tornado Watch for a fe...