Latest AFD Denver/Boulder-
...POWERFUL WINTER STORM WILL CONTINUE TO IMPACT THE AREA THROUGH SUNDAY... Despite some of the wild gyrations we`ve seen in model guidance, the overall plan with this storm is still the same. In fact, the latest EC and GEM ensemble data suggest about the same evolution, if not slightly higher totals, than previous runs. The EC ensemble average is now up slightly to about 1.8" liquid equivalent for Denver, the GEM remains at ~2.4", while the GEFS was down to about 1.8", following the lead of the wildly erratic GFS. The bottom line is that the value of the ensemble data is huge in this storm, and we`ll be keeping the forecast relatively unchanged at this point and favoring the EC ensemble blend. This storm has everything going for it, including infusion of rich Gulf of Mexico moisture, a pronounced TROWAL, a persistent period of moderate to strong QG lift, long duration, and strong upslope as long as the 500 mb low tracks across east central/southeast Colorado. So far, most model averages (not the 12Z NAM and GFS) are still sticking with the upper low tracking from near the Four Corners into southeast Colorado, putting northeast Colorado in a very favorable area for strong lift, upslope, and heavy snowfall. We`ve overall kept the forecast relatively unchanged for this event with 14 to 24 inches for the I-25 Urban Corridor, with locally heavier amounts possible toward Boulder and Golden depending on exact track and evolution of the storm, of course. Foothills should see 2 to 4 foot totals with the heaviest favoring Larimer County. Again, any slight change in track could result in much higher/lower amounts. The 10-90% snowfall graphics represent this uncertainty well, with bottom end (10th percentile) 10" amounts along the I-25 Corridor but the 90th percentile showing amounts near 30". Foothills areas go as high as several feet in the 90th percentile, or worst case scenario!