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Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – June 28-30, 2019

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

In Brief:

The heat is here with 90's F on Thursday. We will get dangerously close to 100°F on Friday then we begin to drop a bit into the upper 90's F before a front arrives Saturday afternoon to cool us to the 80's F. Afternoon storms return on Saturday. Highs in the 80's F with afternoon storms is the new norm into next week.

Forecast Discussion:

I'm still out beyond the reach of the interwebs (a half hour drive brought me back into the world briefly). The big question is will we hit 100°F Friday? Certainly locations out on the Plains will get to 100°F. We have a big high pressure front over the state through the weekend (Figure 1). The GFS is conservative with 90's F in the afternoon as the highest temperatures Friday (Figure 2). Weatherunderground.com gives us 97°F (Figure 3). My guess is locations southeast of Limon are most likely to get that hot.

No storms of much note are expected (you might see one or two in the distance).

The Longer Range Forecast:

Saturday is hot too (Figure 3) -but a front (seen up in Nevada in Figure 1) pushes in and takes the extreme off the heat. That also brings in moisture from a tropical system that is spinning off the Mexican coast and afternoon thunderstorms make a return with a weakening of the high pressure and a shift in the upper atmospheric ridge. Stay cool - I'm getting back to the camp site immediately. (We might hit 82°F while you folks are near 97°F.)

Figure 1: The current surface frontal analysis map from Thursday afternoon.
Figure 2: The forecast temperature at the surface from normal map from the GFS and weather5280.com for Colorado, Friday afternoon.
Figure 3: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com

Current Weather

Rain

Rain

59°F

UV Index
0 Low
Pressure
29.68 Rising
Visibility
7 miles
Dewpoint
39 °F
Humidity
47%
Wind
ENE 5.1 mph
Gust
10.5 mph
Wind Chill
59 °F

Hourly Forecast

Today
8 PM
56°F
Thunderstorms
Today
9 PM
53°F
Cloudy
Today
10 PM
50°F
Thunderstorms
Today
11 PM
48°F
Thunderstorms
Tomorrow
12 AM
46°F
Cloudy
Tomorrow
1 AM
46°F
Cloudy
Tomorrow
2 AM
45°F
Cloudy
Tomorrow
3 AM
44°F
Rain
Tomorrow
4 AM
44°F
Cloudy
Tomorrow
5 AM
44°F
Rain
Tomorrow
6 AM
44°F
Rain
Tomorrow
7 AM
44°F
Rain

7 Day Forecast

Mostly cloudy w/ t-storms

Friday

69 °F

Variable cloudiness with a couple of thundershowers this afternoon; gusty winds and small hail can accompany any downpour


Thunderstorms

Friday Night

41 °F

Cloudy; a couple of showers and a thunderstorm this evening followed by periods of rain late; gusty winds and small hail can accompany any downpour


Rain

Saturday

44 °F

Chilly with periods of rain and a thunderstorm; travel in the foothills and mountains will be slippery due to snow


Rain and snow

Saturday Night

36 °F

Cloudy with rain, mixed with a little snow late; travel in the foothills and mountains will be slippery due to snow


Mostly cloudy

Sunday

61 °F

Mostly cloudy and warmer


Intermittent clouds

Sunday Night

36 °F

A thunderstorm in spots in the evening; otherwise, partly cloudy


Partly sunny

Monday

71 °F

Partly sunny, pleasant and warmer


Partly cloudy

Monday Night

45 °F

Partly cloudy


Mostly sunny

Tuesday

73 °F

Pleasant with sunshine and patchy clouds


Partly cloudy

Tuesday Night

40 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:06 AM
Sunset
7:51 PM

Based on AccuWeather data