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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – July 13th and 14th, 2018

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

Forecast Discussion:

Note, I'm at the end of a 2 week family camping vacation near Red Feather Lakes, CO at this time.  Internet availability is very limited, so these discussions are shorter and simpler than normal.

The moisture is finally here and the temperatures are down a bit.  As I write (internet of opportunity at the library) the afternoon storms have yet to form on Thursday, but hopefully Longmont saw some rain.

Figure 1 shows the returning moisture from the deep southwest as the high pulls off to the east.  The severe weather chances are minimal and would be brief under heavier cells, but both Friday and Saturday, storms are expected to be more of the normal storm strength (Figures 2 and 3).

Figure 1: the water vapor satellite image from Thursday AM. Reds/Oranges are dry air, greys/whites are moist air regions.

Figure 2: the day 2 SPC thunderstorm and severe weather forecast made Thursday (valid Friday).

Figure 3: the day 3 SPC thunderstorm and severe weather forecast made Thursday (valid Saturday).

The longer range forecast:

A short wave ridge crosses the state on Saturday and depresses storm chances. A bit of moisture returns Sunday and beyond---temperatures return to just a bit above normal with afternoon thunderstorms chances.

Figure 4: the next 10 days of the graphical forecast for Longmont, CO from weatherunderground.com

Current Weather

Drizzle

Drizzle

34°F

UV Index
0 Low
Pressure
30.21 Steady
Visibility
2 miles
Dewpoint
32 °F
Humidity
94%
Wind
NNE 2.8 mph
Gust
5.1 mph
Wind Chill
32 °F

Hourly Forecast

Today
8 AM
34°F
Cloudy
Today
9 AM
35°F
Showers
Today
10 AM
36°F
Intermittent clouds
Today
11 AM
38°F
Rain and snow
Today
12 PM
40°F
Intermittent clouds
Today
1 PM
41°F
Intermittent clouds
Today
2 PM
42°F
Cloudy
Today
3 PM
43°F
Cloudy
Today
4 PM
41°F
Cloudy
Today
5 PM
40°F
Cloudy
Today
6 PM
39°F
Rain
Today
7 PM
38°F
Rain

7 Day Forecast

Rain and snow

Friday

43 °F

Chilly with some sun, then turning cloudy; a morning rain or snow shower in spots 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


Flurries

Saturday

40 °F

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


Intermittent clouds

Saturday Night

31 °F

Partly cloudy


Partly sunny

Sunday

64 °F

Partly sunny, pleasant and warmer


Partly cloudy

Sunday Night

41 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Warmer with a blend of sun and clouds


Partly cloudy

Monday Night

36 °F

Partly cloudy


Intermittent clouds

Tuesday

64 °F

Cooler with periods of clouds and sunshine


Mostly cloudy

Tuesday Night

40 °F

Mostly cloudy


Sunrise and Sunset

Sunrise
6:15 AM
Sunset
7:44 PM

Based on AccuWeather data