The atmosphere has saturated across the entire tri-state, so everyone should be seeing snow at this time. I’m currently reporting moderate snow with 3/4 to 1/2 mile visibility. I’d say we’re nearing an inch already here in Montgomery (NE Ham CO), with another 2-3″ expected by sunrise. I’ve tapped into the radar at CVG, and it shows a nice coverage of snow across the entire tri-state (with embedded moderate banding):
Light to moderate (even heavy at times) snow is closing in on the tri-state, with flakes being reported as close as Northern Kentucky. Expect the leading edge to reach the metro by 1am, and the east side by 3am. Once the snow commences, it will become steady rather quickly. Given the very cold air/ground temps, all snow will accumulate, even on treated surfaces. As I’ve been saying all day, I expect all schools to be closed Tue, with many having delays/closings on Wed as well. Take it slow out there tomorrow if you ABSOLUTELY have to drive.
The National Weather Service has issued a WINTER STORM WARNING, effective midnight tonight through 6pm Wed. An area of low pressure, currently developing to our south, will begin to slide NE towards the tri-state. Out ahead of it, widespread precipitation will develop in the form of snow. I expect the first flakes to hit the ground between 2-3am, quickly becoming steady. The snow, heavy at times, will continue through the late afternoon hours before it winds down in evening. By then, we will have a solid 3-6″. The snow will wind down for a brief period (bit of a lull in the action), but will once again commence tomorrow night as the ULL (upper-level low) spins overhead. With the added energy and lift tomorrow night, expect another couple inches of snow. In total (by Wed AM), all of the immediate tri-state will see a solid 5-8″, with 8″+ just to the north/northwest of the metro. In addition, with an abundance of energy at the mid/upper levels, spotty thundersnow is possible midday tomorrow through tomorrow evening. If that occurs, rapid accumulation in a very short period of time (2″+ an hour rates) would be likely. As for schools, I expect all to be closed tomorrow. A delay would be inefficient as the snow will continue through the afternoon (same goes for an early-dismissal). Roads will become slick and hazardous tomorrow, continuing through much of Wed as temps will be well below freezing (harder to melt/clear). I will have hourly (bi-hourly if necessary) updates posted through the night, so stay tuned!
*WINTER STORM WARNING IN EFFECT UNTIL 6PM SATURDAY*
Temps across the tri-state are in the lower to middle 30s at this time, which is allowing for most of the precip to fall as light rain. I’ve been in contact with weather observers across the tri-state and there are spotty reports of sleet (most recently in SW Ham CO), though it won’t accumulate much due to the marginal surface temperatures. Most of the precip should fall as rain through midday as a brief tounge of warm air punches into the tri-state. However, as the area of low pressure begins to slide a bit further east, temps at all levels (surface to the upper-levels) will begin to crash, allowing the rain to change to snow. This should occur between 2-5pm (2pm for the NNW counties and 5pm for the SSE counties). Once this changeover to snow occurs, it will come down fairly heavily through tomorrow morning, with significant accumulations for everyone (see graphic below). Roads should be in decent shape through 4pm in most spots, but after that, expect conditions to deteriorate rather rapidly (about an hour or so after the changeover occurs). The main event will occur this evening through tomorrow morning when a large swath of moderate to heavy snow will slide through. Given the impressive dynamics in place/plenty of lift to work with, I wouldn’t rule out spotty thundersnow (enhanced bands of snow containing thunder/lightning). I don’t think that will be widespread, but don’t be surprised if you see a flash of lightning or hear a clap of thunder. If all goes as planned, expect very hazardous road conditions through Saturday (and even into Sun, depending on how much we end up with). Plan on not going anywhere Saturday…
