A strong low pressure system is forecasted to begin to organized and wrap up over Utah on Tuesday and Wednesday October 27 and 28th. Tonight both the NAM and GFS forecast models are in agreement and have the low pressure system tracking slowly across southern Utah and southern Colorado Tuesday, Wednesday, into Thursday morning and then hooking northeastward into far northeastern Colorado and southwest Nebraska on Thursday afternoon/evening. Right now it looks like light snow will begin falling sometime late Tuesday night into Wednesday morning over southeastern Wyoming and it will develop southward into northeastern Colorado shortly after (especially near the foothills). The general consensus is that the heaviest snow will fall Wednesday or Wednesday night over the Colorado Front Range urban corridor. The GFS predicts the heaviest snow to begin falling early Wednesday morning through Wednesday evening while the NAM holds off the heaviest snowfall until Wednesday evening into early Thursday morning.
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GFS
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Total water equivalent precipitation forecast for both the NAM and GFS are in agreement that a significant amount of precipitation will fall. Somewhere between 0.75″ and 1.5″ of water equivalent precipitation is forecasted to accumulate by Friday morning. If we use the standard 10:1 snow to water ratio, 7.5 to 15 inches of snow will fall across all of Northeastern Colorado. If the NAM verifies, parts of southeastern Wyoming will get more than 2 feet of snow.
** Update Oct 27th: Several watches and warnings have been issued by the National Weather Service. Right now it appears that the heaviest snowfall will occur east of the continental divide of the Front Range where up to 2 feet may fall. Plains locations from Denver north and eastward could see 8″ to 14″. Here’s a link to a newsfeed of the warnings: