Jeb Posted December 11, 2013 Report Share Posted December 11, 2013 2013-2014 winter weather. Posted in the December Banter Thread 2, Page 25, post 874 http://www.americanwx.com/bb/index.php/topic/41896-december-banter-thread-2/?p=2533314 State of the snowpack - December 11 2013 Its barely mid December and Woodbridge already has 2 inches of snow and sleet on grassy surfaces. The snowpack is composed of an inch of glaciated snow and sleet, with another inch of compacted, frozen snow on top. The ground is surface frozen which supports the snow/sleetpack. An anomalous frigid airmass over the eastern two thirds of the US will likely preserve this snow/sleetpack for at least part of the week. Plows have piled up piles of sleet and snow as much as three feet tall. Tonight these will freeze fairly hard as temps fall to near 20 degrees. If this anomalously cold pattern continues, we could hold on to snowpack into next week. This is early for northeastern Virginia and is not indicated by climatology. This weather pattern is much more representative of late January. -------------------- This is the post to use for the description of the Dec 8-9 2013 snow/sleet/zr storm. http://www.americanwx.com/bb/index.php/topic/41909-winter-storm-128-9-observationsnowcasting-ii/?p=2524265 Sunday December 8 2013 snow and sleet storm. It had two parts. The first part was snow and sleet from 7am to 2pm which then mixed with ZR. We had FZDZ into the evening then the 2nd part of the storm was freezing rain which steadily fell from 9pm to 5am. The temperature during the day was in the 20s and rose to 30, where it remained into 4am. The snow and sleet accumulated an inch. The afternoon ZR then iced up the snow/sleetpack and soaked it. The ZR lin the evening into the overnight accreted a third of an inch of ice over the existing snowpack. The ice accumulation brought down branches and caused power outages. Pine tree branches were the hardest hit by the ice. I saw pine branches at least 6 inches in diameter that had been snapped off. The snow and sleet in the first part of the storm readily accumulated on roads as well as grassy areas. The sleet piled up on roads despite initial road temperatures in the low 40s. Models progged temperatures to rise above freezing at 9Z which is 4am EDT Dec 9. The temperatures stayed at or below freezing until after sunrise. The high on the 9th was only 34 degrees. It stayed cloudy. Some ice melted but much of it remained on the trees and on roads, sidewalks, cars, fences and bushes well into the day. The third of an inch of ice was difficult to remove from cars, particularly if the snow and sleet had been removed before the nighttime icing started. I missed getting to go to the R and get my Bailey and opp some lebs. It would have been a very good day to Bailey and get AD cycles because there would have been very few ppl around. Jon said they closed at 3pm Sunday. Tuesday December 10 2013 snowstorm Models had indicated 4-6 inches of snow which was supposed to start at 7am, perhaps mixing with sleet at the onset. The snow started around 7ish. I woke up at 830am and noticed about a half inch of snow on roads and grass, then heard the ping of sleet mixed in with the snow. We also had a period of very light snow and sleet between 830am and 1030am. Then the snow picked up and fell moderately through at least 1130am but the boundary layer temps were marginal, around 32. The upper level low was moving very fast and the snow was over by noon. I slept til 230pm then saw the sun was out, temps rose to 38 degrees and the snow on the roads and sidewalks melted but we had picked up an inch and a half od fresh snow on cartops and on top of the inch of glacier from 2 days ago. We've had three days of snow cover - The snow/sleet and ZR that fell Sunday Dec 8 stuck around thru Dec 9 into this event which added another inch and a half of snow for three days so far of snow cover. This week is progged to be pretty cold. We might hold on to the snowpack for another few days. Higher elevations such as where Trixie lives near CharlesTown got 4 inches of snow. FDK got about 5-6 inches of snow. They got more banding, just like the Rap had indicated. Jan 28 2014 It is like atmospheric magic. A meteorologist could not have co-located everything at once at the same time over one area. Tanking mid level heights with the incoming PV max, the most divergent portion of that upper jet coupling, strong 600-800 frontal forcing, strong low level moist theta-e advection into the frontal circulation, and extreme convergence into the low level cyclone. I am thinking this is going to be ripping heavy TSSN over N IL like nothing before. baroclinic_instability 12/8/13...1" SN/IP + 1/3 inch ZR 12/10/13...1.5" SN 12/17/13...surprise 1/2" SN 1/3/14...2" SN 1/21/14...5" SN 12 inches of snow 2013-14 season --- 22 days of snow cover <p> ----------------------------------------------------------- Quote Link to comment Share on other sites More sharing options...
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