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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – March 26, 2019

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

Forecast Discussion:

To use an old joke of mine; I'm issuing a nice-weather alert for today and tomorrow (Tue and Wed). We have high pressure over the state (and a big ridge aloft). We break 70F today. Wonderful. Tomorrow will be even warmer.

The longer range forecast:

Our big, approaching, late week Spring storm is visible out in the Pacific in Figure 1 and in Figure 2, the water vapor satellite image. The rivers of moisture from the warm (El Nino) tropics are flowing up shown by the dark green arrows. Figure 3 is our standard 10 day graphical glance and the wonderful warmth holds even into Thursday AM before the next system splashes in.

Figure 3 shows a day and a half of robust precipitation chances with another batch of energy moving in Saturday overnight. The upper air map for Sunday morning shows the closed low right overhead and fairly strong trough in place (Figure 4). Temperatures are fairly warm, for a storm, this time of year.

We'll look at a wider range of models in later posts this week, but the weatherunderground model and GFS are good early indicators of what might happen. The weatherunderground model has 4/10ths of an inch of rain and less than an inch of snow by Sunday morning. This seems very under-done to me.

The GFS (Figure 5) has a very healthy 1.5 inches of water and 3-4 inches of snow by Sunday morning. That might be over-done, but, again, we'll keep an eye on it. I'm planning on the first camping outing of the year... I might need ponchos.

Figure 1: The forecast surface map for Tuesday PM from NCEP.
Figure 2: The water vapor satellite image from Monday night from NOAA. Longmont is the pink dot.
Figure 3: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 4: The 500mb forecast upper air analysis for Sunday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.
Figure 5 : the forecast accumulated precipitation map from the GFS and weather5280.com for Colorado, through Sunday AM.
Figure 6 : the forecast accumulated snow map from the GFS and weather5280.com for Colorado, through Sunday AM.

Current Weather

Cloudy

Cloudy

36°F

UV Index
1 Low
Pressure
30.23 Rising
Visibility
8 miles
Dewpoint
34 °F
Humidity
90%
Wind
NNE 3.3 mph
Gust
6.5 mph
Wind Chill
35 °F

Hourly Forecast

Today
12 PM
38°F
Mostly cloudy
Today
1 PM
39°F
Intermittent clouds
Today
2 PM
40°F
Cloudy
Today
3 PM
41°F
Cloudy
Today
4 PM
42°F
Cloudy
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
35°F
Flurries
Today
10 PM
35°F
Cloudy
Today
11 PM
35°F
Rain and snow

7 Day Forecast

Rain and snow

Friday

42 °F

Cloudy and chilly; a couple of showers of rain or snow this morning followed by a little rain this afternoon


Rain and snow

Friday Night

32 °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, remaining cloudy and chilly; storm total snowfall 1-3 inches


Intermittent clouds

Saturday Night

31 °F

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


Partly sunny

Sunday

64 °F

Partly sunny, pleasant 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

36 °F

Partly cloudy


Mostly cloudy

Tuesday

64 °F

Mostly cloudy and cooler


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data