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The Front Range Forecast: A Spring Snow is on the way

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Figure 5: the 10:1 snowfall forecast for the next 3 days from the GFS and tropicaltidbits.com

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.

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Figure 1: the 10 day graphical forecast for Longmont from weatherunderground.com
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Figure 2: the surface forecast map and precipitation for Sunday PM from the GFS and tropicaltidbits.com
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Figure 3: the surface forecast map and precipitation for Sunday midnight from the GFS and tropicaltidbits.com
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Figure 4: the snowfall forecast from Matt Makens and weather5280.com
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Figure 5: the 10:1 snowfall forecast for the next 3 days from the GFS and tropicaltidbits.com
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Figure 6: the precipitation forecast for the next 3 days from the GFS and tropicaltidbits.com

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.

 


About the Author: John Ensworth

John Ensworth used to work from Longmont as the PI for the NASA through the IGES (The Institute for Global Environmental Strategies). He now teaches technology, algebra, astronomy, meteorology, film school, and Lego robotics to middle/high school.
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Current Weather

Sunny

Sunny

62°F

UV Index
2 Low
Pressure
29.65 Falling
Visibility
6 miles
Dewpoint
59 °F
Humidity
88%
Wind
SW 1.6 mph
Gust
3.2 mph
Wind Chill
62 °F

Hourly Forecast

Today
8 AM
69°F
Sunny
Today
9 AM
76°F
Mostly sunny
Today
10 AM
81°F
Mostly sunny
Today
11 AM
85°F
Partly sunny
Today
12 PM
88°F
Intermittent clouds
Today
1 PM
90°F
Intermittent clouds
Today
2 PM
92°F
Intermittent clouds
Today
3 PM
90°F
Intermittent clouds
Today
4 PM
88°F
Mostly cloudy w/ t-storms
Today
5 PM
85°F
Intermittent clouds
Today
6 PM
84°F
Intermittent clouds
Today
7 PM
82°F
Intermittent clouds

7 Day Forecast

Partly sunny w/ t-storms

Saturday

92 °F

Warmer with intervals of clouds and sunshine; a thunderstorm around this afternoon


Mostly clear

Saturday Night

57 °F

Clear to partly cloudy


Mostly sunny

Sunday

93 °F

Sunny to partly cloudy and very warm


Partly cloudy

Sunday Night

56 °F

Partly cloudy


Partly sunny

Monday

94 °F

Partly sunny and hot; breezy in the afternoon


Clear

Monday Night

55 °F

Windy in the evening; clear


Partly sunny

Tuesday

80 °F

Partly sunny and cooler; breezy in the afternoon with a thundershower in spots


Mostly cloudy

Tuesday Night

52 °F

Mostly cloudy with a shower in the area late


Cloudy

Wednesday

75 °F

A thunderstorm around in the morning; otherwise, cloudy


Intermittent clouds

Wednesday Night

55 °F

Partly cloudy with a stray thunderstorm late


Sunrise and Sunset

Sunrise
5:30 AM
Sunset
8:32 PM

Based on AccuWeather data