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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – July 23-24, 2019

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

In Brief:

We return to normal (or a bit below normal) temperatures Tuesday and on into next week. With monsoon/tropical moisture sitting around, afternoon thunderstorms over our very moist state are a possibility every day.

Forecast Discussion:

Monsoon (or moisture flow from the tropics/Gulf of Mexico and Gulf of California) moisture is drifting around (Figure 1) a high pressure system over the four corners areas. This will lead to a chance of afternoon storms every day - starting in the mountains and drifting southeast (Figure 2).

Temperatures will be just about average for this time of year beginning today (Tuesday - Figure 2).

The Longer Range Forecast:

The high over the southwest will drift VERY slowly deeper down into the southwest as the week wears on. This will keep some moisture drifting in (green arrows - Figure 3) and abnormally cool air filtering down into the central U.S. (Figure 4). This will be a strange end of July for much of the U.S. and we are on the edge of this cool-ish air.

I'm off on ANOTHER business trip - so I'll need to 'cover a few days at a time' again. I'll be watching the state from San Francisco this time... gotta pack that suitcase again.

Figure 3: the water vapor satellite image (browns/reds are dry air, whites and light grey is moist air, purple/blue is ice and high cloud tops). From the the NWS Monday PM.
Figure 2: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 3: Image of the 500mb pattern for Thursday at noon from the GFS and tropicaltidbits.com.
Figure 4: Image of the surface temperature anomaly (departure from normal) pattern for Thursday at noon from the GFS and tropicaltidbits.com.

Current Weather

Mostly sunny

Mostly sunny

54°F

UV Index
3 Moderate
Pressure
29.63 Falling
Visibility
8 miles
Dewpoint
22 °F
Humidity
29%
Wind
WSW 7.5 mph
Gust
17.8 mph
Wind Chill
54 °F

Hourly Forecast

Today
10 AM
55°F
Showers
Today
11 AM
57°F
Intermittent clouds
Today
12 PM
58°F
Mostly cloudy
Today
1 PM
59°F
Mostly cloudy
Today
2 PM
60°F
Intermittent clouds
Today
3 PM
62°F
Intermittent clouds
Today
4 PM
60°F
Intermittent clouds
Today
5 PM
58°F
Intermittent clouds
Today
6 PM
56°F
Intermittent clouds
Today
7 PM
54°F
Intermittent clouds
Today
8 PM
51°F
Intermittent clouds
Today
9 PM
48°F
Partly cloudy

7 Day Forecast

Partly sunny w/ showers

Tuesday

62 °F

A brief morning shower or two; otherwise, windy with times of clouds and sun


Partly cloudy

Tuesday Night

34 °F

Partly cloudy and colder; there can be frost in the normally colder spots


Intermittent clouds

Wednesday

59 °F

Cool with times of clouds and sun


Mostly cloudy w/ showers

Wednesday Night

37 °F

Increasing clouds with a shower in spots late


Partly sunny w/ showers

Thursday

56 °F

Times of clouds and sun with a couple of showers; cool


Cloudy

Thursday Night

40 °F

Cloudy


Mostly cloudy

Friday

66 °F

Mostly cloudy and warmer


Mostly clear

Friday Night

40 °F

Mainly clear


Mostly sunny

Saturday

74 °F

Mostly sunny, pleasant and warmer


Mostly clear

Saturday Night

43 °F

Mainly clear


Sunrise and Sunset

Sunrise
5:52 AM
Sunset
8:02 PM

Based on AccuWeather data