ChescoWx Posted December 28, 2016 Share Posted December 28, 2016 Latest Wxsim with 6z blend of GFS/NAM data at 12/28 has snow overspreading NW Chesco by 6am tomorrow morning with temps at 32.0. Quickly to a thump of heavy snow by 7am temp 31.7 with a 0.5" of snow on the ground. By 10am still Heavy Snow with 1.5" on the ground and a temp of 32.4. Mixing by 1030am with 2.0" on the ground and 32.6. Precip continues as a mix of snow and rain before ending by 1pm. Total water equiv 0.52". This will likely be quite elevation dependent....this forecast is for over 650ft ASL. Will need much heavier rates to overcome boundary layer issues below 500ft. A little more light snow right around midnight on New Years Eve with another 0.2" of snow. Link to comment Share on other sites More sharing options...
Ralph Wiggum Posted December 28, 2016 Share Posted December 28, 2016 I think wxsim is being too aggressive with the snowfall tomorrow....just mho. Regardless, you need to change the date to the 29th. Link to comment Share on other sites More sharing options...
ChescoWx Posted December 28, 2016 Author Share Posted December 28, 2016 Latest Wxsim with the 18z NAM and 12z GFS on 12/28 (Thanks Steve!) has slightly increased snowfall (and total precip) now to 2.2" of snow and 0.60" of liquid with the same basic start/stop timetables. Snow will gradually change to a mix of Snow and Rain but never going to all rain depending on intensity. High temp tomorrow 34.2. I will update within the hour when the GFS 18z is added into the equation Link to comment Share on other sites More sharing options...
ChescoWx Posted December 29, 2016 Author Share Posted December 29, 2016 Updated 18z data for both GFS/NAM brings snowfall back down to 1.2" and total precipitation down to 0.55" maintains a mix of snow and rain during the duration of the "event" with temps slightly above freezing by 830am Link to comment Share on other sites More sharing options...
hazwoper Posted December 29, 2016 Share Posted December 29, 2016 1 hour ago, ChescoPaWxman said: Updated 18z data for both GFS/NAM brings snowfall back down to 1.2" and total precipitation down to 0.55" maintains a mix of snow and rain during the duration of the "event" with temps slightly above freezing by 830am With winds everywhere out of the ESE overnight into tomorrow morning I'd venture a guess even you will switch to plain rain, and fairly quickly. Although, it may be close that far west and with some elevation. Link to comment Share on other sites More sharing options...
ChescoWx Posted December 29, 2016 Author Share Posted December 29, 2016 18 minutes ago, hazwoper said: With winds everywhere out of the ESE overnight into tomorrow morning I'd venture a guess even you will switch to plain rain, and fairly quickly. Although, it may be close that far west and with some elevation. If I was making a forecast agreed ++ but just sharing what the forecasting program is spitting out.... Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted December 29, 2016 Share Posted December 29, 2016 Sticking some OBS in this thread... Temps IMBY hit freezing about 4:30 am and have been steadily rising since. Currently 34.2F with light rain. Am not seeing any flakes mixed in or hearing any pingers. Rain started about 10 minutes ago. Link to comment Share on other sites More sharing options...
Ralph Wiggum Posted December 29, 2016 Share Posted December 29, 2016 Brief sleet then over to plain rain here 33F. Link to comment Share on other sites More sharing options...
JTA66 Posted December 29, 2016 Share Posted December 29, 2016 Rain/snow mix on the ride from Lansdale to Horsham this morning. The ground is just wet but there was a slushy coating on my windshield. Temp was 33.3F when I left the house. Link to comment Share on other sites More sharing options...
Blowbyu24 Posted December 29, 2016 Share Posted December 29, 2016 Everything is covered. 2 inches here just south of Lehighton. Snow has picked up some since 7am. 31 degs and light snow still coming down. Link to comment Share on other sites More sharing options...
geeter1 Posted December 29, 2016 Share Posted December 29, 2016 27 Degrees IMBY Light Snow - 1 inch on the ground Link to comment Share on other sites More sharing options...
ChescoWx Posted December 29, 2016 Author Share Posted December 29, 2016 Just some light drizzle now and 36.0 in NW Chesco Interesting little event - temps rose above freezing here 1 hour before the first flake with no ZR or IP at all just snow to rain - obviously no accumulation. Paul Link to comment Share on other sites More sharing options...
RkTec Posted December 29, 2016 Share Posted December 29, 2016 0.8" snow accumulation prior to changeover to rain. Currently have a temp of 34 with light rain Link to comment Share on other sites More sharing options...
JoeSeNJ Posted December 30, 2016 Share Posted December 30, 2016 Nice little sleet and snow shower Link to comment Share on other sites More sharing options...
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