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

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

Forecast Discussion:

We are a weather pattern in transition now.  Moisture is coming back into the western US (but it is not a lot yet). Figure 1 shows a strip of very dry air still down the plains near the Front Range foothills (us). The moisture in the western Colorado Rockies did kick off a few showers in the afternoon Monday.

What is interesting is the severe weather and convective outlook from the SPC for Monday. Compare the pattern in Figure 2 with the satellite image of moisture in Figure 1.  That same dry strip shows up as a region with no convection possible (and nothing ultimately formed).

For late tonight, with a stationary front still parked up in Wyoming, we do have a bit more moisture in the mountains and a chance of showers. These 'might' drift over the I-25 communities this evening (Figure 3).

We will still have to deal with smoke. It is pouring in from the west (primarily) - though it is not as thick over Longmont today as it could be (like the northern tier of states) - Figure 4.

Figure 5 shows the storm and severe storm potential for today.  With a bit more moisture (but with cooling caused by the weakening upper level ridge and the smoke over head) we'll see some storms possible over most of the state (except for the Kansas border) - Figure 5.

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

Figure 2: the day 1 SPC thunderstorm and severe weather forecast made Monday (valid Monday).

Figure 3: The forecast surface map for Wednesday AM. From NCEP.

Figure 4: The HRRR (high resolution rapid refresh) model forecast of smoke at all levels for Tuesday noon.

Figure 5: the day 2 SPC thunderstorm and severe weather forecast made Monday (valid Tuesday).

The longer range forecast:

More moisture arrives with easterly surface winds and the upper level trough gets closer to the state.  That should create some severe weather along I-25 on Wednesday.  More about that, and the additional rains and storms (especially the hail this weekend), and the overall cool down- tomorrow.

Figure 6: the day 3 SPC thunderstorm and severe weather forecast made Monday (valid Wednesday).

Current Weather

Sunny

Sunny

60°F

UV Index
6 High
Pressure
30.04 Falling
Visibility
8 miles
Dewpoint
33 °F
Humidity
37%
Wind
SE 3.2 mph
Gust
7 mph
Wind Chill
60 °F

Hourly Forecast

Today
3 PM
62°F
Partly sunny
Today
4 PM
65°F
Intermittent clouds
Today
5 PM
66°F
Intermittent clouds
Today
6 PM
65°F
Intermittent clouds
Today
7 PM
63°F
Intermittent clouds
Today
8 PM
60°F
Mostly clear
Today
9 PM
57°F
Mostly clear
Today
10 PM
55°F
Mostly clear
Today
11 PM
52°F
Mostly clear
Tomorrow
12 AM
50°F
Mostly clear
Tomorrow
1 AM
48°F
Mostly clear
Tomorrow
2 AM
47°F
Mostly clear

7 Day Forecast

Intermittent clouds

Saturday

66 °F

Not as warm with intervals of clouds and sunshine


Mostly clear

Saturday Night

39 °F

Clear to partly cloudy


Mostly cloudy

Sunday

77 °F

Mostly cloudy and warmer; breezy in the afternoon


Mostly cloudy

Sunday Night

45 °F

Rather cloudy and windy


Windy

Monday

60 °F

Very windy; cloudy and cooler


Intermittent clouds

Monday Night

43 °F

Partly cloudy


Intermittent clouds

Tuesday

62 °F

Times of clouds and sun; windy in the afternoon


Partly cloudy

Tuesday Night

36 °F

Partly cloudy


Intermittent clouds

Wednesday

60 °F

Times of clouds and sun


Intermittent clouds

Wednesday Night

35 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:55 AM
Sunset
7:59 PM

Based on AccuWeather data