Just saw someone mention an ob of thunder near Huntsville on southerwx. It showed up on GOES derived flashes, and if that correlation coefficient above is right, someone in N AL just got thunder snow.
For you Chattanooga folks, looks like a rain/snow line is heading up Interstate 59:
It's not too distinct until the last few frames. No clue if it keeps moving at that pace, but it is a fair clip.
I'm going to drink some coffee and then go on a little adventure up towards Wartburg. I bet I only have to drive 5 miles on highway 27 to get into the snow. That's just based on y'alls obs this AM. I haven't looked at the radar or temps up here yet.
Here'a a weird HRRR theory, what if it it is just got some parameter that automatically raises the temp when there's daylight:
I don't know why else it would randomly decide to change some areas over to rain or mix? Does it think the downsloping is increasing?
Sound from over my area at the end of that run:
Look how small that boundary layer warmth is.
It looks like it is still digging to me. I think it will make a run at the Gulf:
Nice t-storms starting to pop there too (thankfully not parallel to the coast to cut off moisture.
It's wild that they would raise it just a couple of hours before they give the afternoon update, and then lower it. I could see if an event was ongoing and over or under performing, and people needed info, but that's just extra work, lol.
Just looking at the run to run trends on the vort, it looks like the NAM is maybe playing catch up:
Watch the leading edge of the vorticity run further into the FL panhandle each run
Man this sucker really seems to be digging to me. At the latitude of LA's northern border and still heading SE.
It does look like it is starting to make the turn, but you tell me. Maybe I'm looking at the wrong water vapor level, but it looks SW of where the 18z 3km NAM has it.
The above gif starts at 1 PM and is in hourly increments.
HRRR is an amazing run for parts of Cumberland county, but no snow for me, lol. Soundings are still doing that thing where the "guess" snow, but the model shows rain over my area and Roane county.