In Brief:
A warm weekend becomes rain, thunderstorms and some snow at lower elevations.
The Forecast Discussion:
A more Spring-like storm is on its way for Sunday afternoon and evening (Figure 1). This storm will create a more prolonged impact in the mountains (Sun AM to Mon AM, then again Tuesday and Wednesday mid-days). At lower elevations, precipitation will mainly fall between 1pm Sunday and 11pm Sunday (Figure 2 and Figure 3).
The cold front should sweep past Longmont around 2pm. Precipitation will start as rain and thunderstorms with windy conditions and dropping temperatures. Liquid water totals seem to add up to 0.25 to 0.75 inch with locally 1 inch in lucky neighborhoods (Figure 6). Temperatures will be in the 50's Sunday, so we won't see lower elevations switch to snow until evening (the low will be around 20F). The Monday morning commute could be slushy with ice on bridges. Drive carefully//slow down!
Mini-snowfall roundup:
Weather5280.com 1-4" (Figure 4)
The GFS 2-4" (Figure 5)
Channel 9 1-3"
Channel 7 2-3"
I'm calling for 0.5-3" in Longmont.
The Longer Range Forecast:
Things remain cool at the start of the week (Figure 1) with a return of a few rain/snow showers Tuesday PM. We warm up nicely by the end of the week with indications of a more stormy weekend.
