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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – April 19, 2018

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

Forecast Discussion:

Extreme nice weather for today.  Calm winds, sunshine, and temperatures near 70F.  No need for a map on that... let's watch this next storm.

The longer range forecast:

Figure 1 shows the low gathering itself in southern Utah with a front down into AZ.  This is a touch further north, still, over previous forecasts.  That means warmer mid-storm temperatures. Figure 2 shows one low up in NW Colorado and a secondary low down in New Mexico.  We'll have a storm, but it won't be as wet or cold as it looked five days ago.

Figure 3 is the graphical forecast for Thursday through Sunday.  Rain chances begin around 8am Friday but the more persistent rainfall doesn't start until after 6pm.  Rain chances drop off late morning to around noon Saturday. You can see that temperatures don't drop below freezing during this storm, at all.

Figure 4 is the latest snowfall forecast.  Longmont may see a coating on the west side, but most of town won't get any measurable snow according to this.  Estes Park may still see 8-12 inches of snow though. For rainfall (Figure 5) we are up a bit over the forecast for yesterday at 0.25 to 0.5 inches of water.

Looking further out, we remain above freezing for the next 10 days (except for this morning). All model runs in the ensemble put precipitation down for the Fri/Sat storm.  Next week April 24-28 we see unsettled weather giving us chances of rain now and then.  Fertilize your law today if your sprinklers are still off.

Figure 1: The forecast surface map for Thursday PM from NCEP. Longmont is the pink dot.

Figure 2: The forecast surface map for Friday AM from NCEP. Longmont is the pink dot.

Figure 3: 4 days out of the 10 day graphical forecast for Longmont from weatherunderground.com

Figure 4: The GFS snowfall estimate between Wed PM and midday Saturday. Longmont is the pink dot.

Figure 5: The GFS precipitation estimate between Wed PM and midday Saturday. Longmont is the pink dot.

Figure 6: The 10 day graphical forecast from weather5280.com for Denver. Circled area is only morning we drop below (or approach) freezing (the blue line).

Current Weather

Cloudy

Cloudy

36°F

UV Index
1 Low
Pressure
30.27 Rising
Visibility
6 miles
Dewpoint
33 °F
Humidity
89%
Wind
NNE 4.4 mph
Gust
8 mph
Wind Chill
33 °F

Hourly Forecast

Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain
Today
7 PM
38°F
Rain
Today
8 PM
37°F
Cloudy
Today
9 PM
36°F
Flurries
Today
10 PM
36°F
Cloudy
Today
11 PM
36°F
Rain and snow
Tomorrow
12 AM
36°F
Rain and snow
Tomorrow
1 AM
35°F
Cloudy
Tomorrow
2 AM
35°F
Snow
Tomorrow
3 AM
34°F
Flurries
Tomorrow
4 AM
34°F
Snow

7 Day Forecast

Rain and snow

Friday

41 °F

Chilly; rain and snow showers this morning with little or no accumulation followed by rain and drizzle this afternoon


Rain and snow

Friday Night

33 °F

Periods of snow; rain mixed in early, accumulating 1-3 inches; roads could be slippery


Flurries

Saturday

39 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and cold; storm total snowfall 1-3 inches


Intermittent clouds

Saturday Night

30 °F

A shower in places in the evening; otherwise, partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny and warmer


Mostly clear

Sunday Night

41 °F

Mainly clear


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Partly cloudy

Monday Night

40 °F

Partly cloudy


Mostly cloudy

Tuesday

66 °F

Mostly cloudy and not as warm


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data