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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – May 22, 2019

This content was originally published by the Longmont Observer and is licensed under a Creative Commons license.

In Brief:

A Freeze Warning is in effect later tonight through Wednesday morning. Protect sensitive outdoor plants!

We'll have another chance of picking up (probably less than 1/2 inch) of rainfall Wednesday through Thursday with a bit of early morning and late night Thursday snow again. Beyond that we warm up for the weekend and see anther cool and wet system for next week.

Forecast Discussion:

Alert brief: Freeze Warning issued May 21 at 12:01PM MDT until May 22 at 8:00AM MDT by NWS Denver CO.
The National Weather Service in Denver has issued a Freeze Warning, which is in effect from 10 PM this evening to 8 AM MDT Wednesday.
* TEMPERATURES...Falling into the upper 20s to lower 30s.
* TIMING...Late tonight through Wednesday morning.
* IMPACTS...Freezing temperatures could kill sensitive vegetation and damage unprotected outdoor plumbing. (Figure 1).

Another short wave trough rolls through today and tonight increasing our rain chances again (Figure 2). There IS a chance of a rain/snow mix Thursday AM and again as the precipitation tapers off later Thursday night.

The next system is pretty moist- but most of the precipitation will remain out in the mountains and to the west (Figure 3).

The Longer Range Forecast:

Over the next 3 days, we might see a 1/3rd of an inch of rain (by weatherunderground.com - Figure 2) or 1/2-3/4ths of an inch from the GFS (Figure 4). The three day snowfall map has snow right down to the western neighborhoods of Longmont (Figure 5).

After a relatively warm and dry weekend (with afternoon thunershowers each day - Figure 2) another system moves in for next week (Figure 6 - red trough plowing into the state Tuesday). Crazy cool/cold May!

Figure 1: Spring storm highlights notice from the NWS.
Figure 2: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 3: The forecast surface map for Wednesday night from NCEP.
Figure 4 : the forecast accumulated precipitation map from the GFS and weather5280.com for Colorado,over the next 3 days.
Figure 5: the forecast accumulated snowfall map from the GFS and weather5280.com for Colorado,over the next 3 days.
Figure 6: The 500mb forecast upper air analysis for next Tuesday morning. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.

Current Weather

Light snow

Light snow

35°F

UV Index
0 Low
Pressure
30.26 Rising
Visibility
2 miles
Dewpoint
29 °F
Humidity
79%
Wind
ENE 1.6 mph
Gust
4.5 mph
Wind Chill
35 °F

Hourly Forecast

Today
8 PM
36°F
Showers
Today
9 PM
37°F
Cloudy
Today
10 PM
38°F
Cloudy
Today
11 PM
38°F
Cloudy
Tomorrow
12 AM
38°F
Cloudy
Tomorrow
1 AM
37°F
Cloudy
Tomorrow
2 AM
36°F
Cloudy
Tomorrow
3 AM
35°F
Cloudy
Tomorrow
4 AM
35°F
Mostly cloudy
Tomorrow
5 AM
34°F
Mostly cloudy
Tomorrow
6 AM
34°F
Cloudy
Tomorrow
7 AM
35°F
Cloudy

7 Day Forecast

Rain and snow

Thursday

38 °F

Cloudy and much colder; snow showers this morning, accumulating a coating to an inch followed by brief showers this afternoon


Mostly cloudy

Thursday Night

34 °F

An evening shower in spots; otherwise, mostly cloudy


Mostly cloudy w/ showers

Friday

47 °F

Chilly with some sun, then turning cloudy; a little rain in the afternoon


Rain and snow

Friday Night

33 °F

Periods of snow; rain mixed in early, accumulating an inch or two


Flurries

Saturday

43 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and chilly; storm total snowfall an inch or two


Intermittent clouds

Saturday Night

31 °F

Partly cloudy


Partly sunny

Sunday

69 °F

Pleasant and warmer with partial sunshine


Partly cloudy

Sunday Night

44 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Very warm with a blend of sun and clouds


Intermittent clouds

Monday Night

36 °F

Increasing clouds


Sunrise and Sunset

Sunrise
6:17 AM
Sunset
7:43 PM

Based on AccuWeather data