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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – July 8th, 2019

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

In Brief:

We hover in the 80's F for Sunday and Monday (Sunday is posting day) with severe weather possible each afternoon. After that we warm to center on 90°F with only wandering thunderstorms most afternoons.

Forecast Discussion:

We have another stream of moisture coming into the state through Monday, and a trough to the west (Figure 1). This places boundaries, fronts, and a trough down stream of the Rockies- around the state (Figure 2) Sunday and Monday. Severe weather (hail and high winds) are a risk both Sunday and Monday afternoons (Figure 3 and Figure 5). This is a Marginal Risk (1 on a scale of 1 -5) according to the Storm Prediction Center both days.

The Longer Range Forecast:

We return to 90's F for most of the week with afternoon wandering, mountain initiated, thunderstorms (Figure 4). Over the next 48 hours, we should get some rain (maybe up to a quarter inch - Figure 6) unless a lucky thunderstorm core hits (aka Friday).

Figure 1: 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 Weather Channel.
Figure 2: The forecast surface map for Friday night from NCEP.
Figure 3: The severe storm weather forecast for the U.S. from the Storm Predication Center in Norman, OK. Made Sunday for Sunday.
Figure 4: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 5: The severe storm weather forecast for the U.S. from the Storm Predication Center in Norman, OK. Made Sunday for Monday.
Figure 6: the forecast accumulated precipitation map from the GFS and weather5280.com for Colorado, for the next 2 days.

Current Weather

Mostly cloudy

Mostly cloudy

40°F

UV Index
0 Low
Pressure
29.8 Steady
Visibility
8 miles
Dewpoint
30 °F
Humidity
68%
Wind
N 2.7 mph
Gust
4.7 mph
Wind Chill
38 °F

Hourly Forecast

Today
6 AM
38°F
Cloudy
Today
7 AM
37°F
Intermittent clouds
Today
8 AM
38°F
Intermittent clouds
Today
9 AM
41°F
Intermittent clouds
Today
10 AM
44°F
Intermittent clouds
Today
11 AM
47°F
Intermittent clouds
Today
12 PM
49°F
Intermittent clouds
Today
1 PM
51°F
Intermittent clouds
Today
2 PM
52°F
Intermittent clouds
Today
3 PM
52°F
Intermittent clouds
Today
4 PM
51°F
Intermittent clouds
Today
5 PM
50°F
Intermittent clouds

7 Day Forecast

Partly sunny w/ showers

Friday

52 °F

Cooler with times of clouds and sun; a couple of showers late this afternoon


Showers

Friday Night

34 °F

A couple of showers this evening; otherwise, cloudy


Mostly cloudy

Saturday

60 °F

Mostly cloudy


Intermittent clouds

Saturday Night

34 °F

Partly cloudy


Intermittent clouds

Sunday

62 °F

Periods of clouds and sun


Mostly cloudy

Sunday Night

33 °F

Becoming cloudy


Showers

Monday

52 °F

Cloudy and cooler with occasional rain; windy in the afternoon


Intermittent clouds

Monday Night

29 °F

Windy in the evening; partly cloudy


Mostly sunny

Tuesday

61 °F

Mostly sunny and milder


Clear

Tuesday Night

29 °F

Clear


Sunrise and Sunset

Sunrise
6:48 AM
Sunset
7:23 PM

Based on AccuWeather data