Chinook

Pictures: newest Wikipedia info. Graphic that was tweeted by Jim Cantore.

Here are some maps regarding the Mid-Atlantic storm. The vertical-horizontal cross section (4th picture) shows the warm layer at 850mb extending well into the middle part of the image, with below freezing underneath 850mb. That's where the sleet/freezing rain should exist. I used the RH as colors, as to make it less confusing. Green colors are values of high relative humidity. On the 5th picture you can see temperatures above 0C at 850mb in the same places as those of temps below 30F surface temperature.

It looks like the debris signature for this has tracked from south of Newton MS to almost Hickory MS

north Texas

I'm just watching Reed Timmer's live stream which started less than 2 hours ago (not sure exactly when it started). He says there has been a Decatur TX, south of town, and also around Weatherford.

a spotter reported damage at Grapevine, near to this non-confirmed tornado warning

tornado on the ground in north Fort Worth at 14:11z

New GFS for Colorado

The 00z convection allowing models seem to have a generic look for severe weather in Louisiana and maybe Arkansas at 48 hours. (day-3)

Interesting to see the CIPS analogs from 2-3 days out.

Winter storm watch for northeastern Colorado, mainly away from the bigger cities

sea level pressure: 1046.7mb and -22 degrees F.

well I guess the NAO is negative, specifically if think that one of the ways to express the NAO index is the SLP anomaly in Ponta Delgada, Azores Islands, minus the SLP anomaly in Iceland and the AO index, which is effectively calculated by SLP (really, 1000mb heights) shows a very negative value today December 1-8 analysis shows a strong negative NAO value and yet the eastern USA had higher than normal heights at 500mb

Here are observations from yesterday's high winds and dust storm. The cold front drove a wall of dirt, which shows up on the colorized visible satellite image shown below. Apparently there are dust storm polygons. (Who knew?)

I actually don't know if this was a confirmed tornado, but hey, huge hole in the storm.

tornado video tweeted by @LandonWX10 on twitter

large and complicated velocity signature with reported multi-vortex tornado

confirmed tornado as of about 6:05 or 6:10 eastern time, Bassfield

Even though there is a strong emphasis on tornadoes today, the SPC has meteorologists issuing MDs for snow in the Midwest.

pretty much all convection-allowing models have numerous discrete thunderstorms at 06z tomorrow night

The Day-3 enhanced outlook is very concerning for this region. Maybe this could go into a moderate risk outlook for tornadoes and wind when we get to the event. The severe weather parameters such as the STP will greatly increase from 21z to 06z. The NAM and GFS have much different values for the 850mb wind in the region in this time frame, as the NAM has up to 60kt in E Arkansas but the GFS is lower. Note the GFS has values of STP of 1.0-2.0 in the Louisiana area. That's still impressive, but not as impressive as this chart.

NWS web page "weather story"

The global models have some general agreement on this. There is an open 500mb trough powering up this snow event on possibly Tuesday.

looks pleasant and sunny, with a minimum of snow in this field

Happy Thanksgiving. 72 years ago, Thanksgiving Day was on the 23rd of November. On the 24th, deep upper level low was over the central USA. This drove an arctic air mass into the Ohio Valley. A surface low pressure intensified in North Carolina, then moved north and stalled in Ohio. Heavy snow and blizzard conditions hit Ohio. This was one of the most impactful weather events for northern West Virginia of all time. http://greatlakes.salsite.com/maps/nov2327_1950_sfc_loop.gif