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Wednesday Update: Longmont Weather Forecast: Warm Thursday, chilly Friday, nice Weekend, showers next week...

In Brief:

Exceptionally warm weather through Monday becomes a chance of showers Tuesday then more seasonable temperatures.

 

Wednesday Update:

We received less than 1/10th of an inch in Longmont, but any moisture is good (Figure 2 update). We warm up except for a chill on Friday (a mostly dry cold front). Heads up, though... middle next week on through next weekend looks chilly and wet day after day.  More on that later!

 

 

Figure2u_04072021Figure 2 update: the CoCoRaHS rainfall total as of 7am Wednesday.

 

End Wednesday update.

Monday Update:

The front arrives this evening, but rain is delayed.  It looks like about a quarter inch of rain will fall between mainly noon and 6pm Tuesday (Figure 1 update). The GFS (Figure 2 update) is more bullish about rainfall and gives us 1/2 to 3/4th inch of rain (Note: that IS the 10 day total, the next 48 hours gives us less than 1/10th inch from the GFS).  That would be nice! Enjoy Spring showers!

 

Figure1u_04052021Figure 1 update: snippet of the the 10 day graphical forecast from weatherunderground.com for Longmont, CO.

 

Figure2u_04052021Figure 2 update: the 10 day (10:1 ratio) total precipitation forecast from the GFS and weather5280.com

 

End Monday Update.

Forecast Discussion:

A giant ridge over the western U.S. (Figure 1) is making much of the nation think thoughts of summer (Figure 2).  Temperature anomalies in the second figure are 20-30 degrees above normal from Arizona up into the upper Midwest.

 

Figure1_04042021Figure 1: the 500mb upper air forecast map for Monday noon from the GFS and tropicaltidbits.com

 

Figure2_04042021Figure 2: the temperature anomaly (departure from normal) for Sunday PM from weather5280.com

 

 

The Longer Range Forecast:

The ripple (trough) on the western side of the ridge is slowly approaching Colorado (Figure 1). That will give us about 1/10th of an inch of rain on Tuesday (Figure 3). The ridge breaks down a bit after this and we remain in the upper 60s and lower 70s for much of the rest of the week, closer to normal.  Enjoy and Happy Easter!

 

 

Figure3_04042021Figure 3: the 10 day graphical forecast from weatherunderground.com for Longmont, CO.

 

 


About the Author: John Ensworth

John Ensworth works from Longmont as the Principle Investigator for the NASA Science Mission Directorate Earth and space science education product review through the IGES (The Institute for Global Environmental Strategies – www.strategies.org).
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Current Weather

Cloudy

Cloudy

39°F

UV Index
0 Low
Pressure
30.24 Steady
Visibility
10 miles
Dewpoint
15 °F
Humidity
37%
Wind
ENE 8.1 mph
Gust
8.1 mph
Wind Chill
33 °F

12 Hour Forecast

Today
3 AM
33°F
Flurries
Today
4 AM
33°F
Cloudy
Today
5 AM
32°F
Cloudy
Today
6 AM
31°F
Cloudy
Today
7 AM
31°F
Cloudy
Today
8 AM
31°F
Cloudy
Today
9 AM
32°F
Cloudy
Today
10 AM
35°F
Cloudy
Today
11 AM
37°F
Rain and snow
Today
12 PM
39°F
Cloudy
Today
1 PM
42°F
Cloudy
Today
2 PM
44°F
Cloudy

7 Day Forecast

Rain and snow

Monday

43 °F

Mostly cloudy with a couple of showers of rain or snow in the afternoon


Rain and snow

Monday Night

31 °F

Plenty of clouds with a rain or snow shower in spots late


Rain and snow

Tuesday

46 °F

Cloudy and chilly with a shower around; perhaps a snow shower early in the day


Rain and snow

Tuesday Night

33 °F

A couple of showers of rain or snow this evening followed by a little snow late, up to 1"


Mostly cloudy

Wednesday

47 °F

Mainly cloudy


Rain and snow

Wednesday Night

38 °F

Considerable cloudiness with a rain or snow shower in spots; not as cold late


Showers

Thursday

51 °F

Considerable cloudiness with a little rain


Snow

Thursday Night

32 °F

Intermittent snow, accumulating 1-3 inches


Snow

Friday

39 °F

Colder with a little snow at times with little or no accumulation


Snow

Friday Night

25 °F

A little snow at times in the evening; otherwise, mostly cloudy and colder


Sunrise and Sunset

Sunrise
6:27 AM
Sunset
7:36 PM

Based on AccuWeather data