MAJOR WINTER STORM IMMINENT (3:30am update)

Posted by Trevor Cole in Daily Weather Updates on 05-02-2010

*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…
Snowfall Through Saturday AM

Comments:

Hun, 3:30 am…?! You’re crazy! But wow it’ll be bad!

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