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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – July 6th and 7th, 2018

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

Forecast Discussion:

This post brings us to the 1/2 mark of my camping trip the northern Colorado.  We are under a flash flood watch as I type today.  Thursday PM (yesterday) promised to be very stormy along I-25 with a marginal risk.  But that hasn't happened yet as I type.

After the "fun" of Thursday, the upper level ridge will move/expand westward.  It dominates the eastern 2/3rds of the nation and will really heat things up again.  Often moisture gets trapped under a ridge and is available for thunderstorm formation in the afternoons when heating hits a maximum.

Figure 1 shows the first three days of the forecast period as reaching near peak heat again with afternoon thunderstorms possible. With moisture around, the heat index (temperature + moisture levels) will be very high.  We get very dry early in the week as the ridge moves a bit further west giving us northwest flow.  Southwest flow returns midweek and a cool front might enter the state to bring back showers (and severe chances out on the plains?).

More in a couple of days!

Figure 1: the next 10 days of the graphical forecast for Longmont, CO from weatherunderground.com

Current Weather

Cloudy

Cloudy

50°F

UV Index
0 Low
Pressure
29.9 Steady
Visibility
7 miles
Dewpoint
45 °F
Humidity
83%
Wind
NNW 1.1 mph
Gust
3.7 mph
Wind Chill
50 °F

Hourly Forecast

Today
7 AM
51°F
Partly sunny
Today
8 AM
51°F
Partly sunny
Today
9 AM
59°F
Partly sunny
Today
10 AM
65°F
Intermittent clouds
Today
11 AM
71°F
Intermittent clouds
Today
12 PM
75°F
Intermittent clouds
Today
1 PM
77°F
Intermittent clouds
Today
2 PM
75°F
Thunderstorms
Today
3 PM
73°F
Cloudy
Today
4 PM
73°F
Cloudy
Today
5 PM
72°F
Cloudy
Today
6 PM
68°F
Cloudy

7 Day Forecast

Mostly cloudy w/ t-storms

Thursday

77 °F

Turning cloudy, warm; breezy, a stray thunderstorm this afternoon


Thunderstorms

Thursday Night

47 °F

A thunderstorm in spots this evening; otherwise, considerable cloudiness


Thunderstorms

Friday

69 °F

Mostly cloudy and not as warm with a couple of thundershowers


Thunderstorms

Friday Night

44 °F

Cloudy with a couple of thundershowers


Rain

Saturday

46 °F

Chilly with periods of rain and a thunderstorm


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late


Mostly cloudy

Sunday

59 °F

Mostly cloudy and warmer; a stray afternoon thundershower


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Mostly sunny

Monday

71 °F

Mostly sunny and warmer


Partly cloudy

Monday Night

39 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:07 AM
Sunset
7:50 PM

Based on AccuWeather data