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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

Partly sunny

Partly sunny

61°F

UV Index
3 Moderate
Pressure
29.82 Rising
Visibility
4 miles
Dewpoint
22 °F
Humidity
23%
Wind
WNW 5.6 mph
Gust
12.4 mph
Wind Chill
61 °F

Hourly Forecast

Today
5 PM
58°F
Intermittent clouds
Today
6 PM
57°F
Intermittent clouds
Today
7 PM
56°F
Intermittent clouds
Today
8 PM
54°F
Intermittent clouds
Today
9 PM
51°F
Intermittent clouds
Today
10 PM
48°F
Intermittent clouds
Today
11 PM
45°F
Intermittent clouds
Tomorrow
12 AM
44°F
Intermittent clouds
Tomorrow
1 AM
43°F
Intermittent clouds
Tomorrow
2 AM
42°F
Cloudy
Tomorrow
3 AM
41°F
Cloudy
Tomorrow
4 AM
41°F
Cloudy

7 Day Forecast

Partly sunny

Wednesday

60 °F

Partly sunny and cool


Mostly cloudy

Wednesday Night

40 °F

Increasing clouds


Partly sunny w/ showers

Thursday

52 °F

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


Partly cloudy

Thursday Night

42 °F

Partly cloudy


Mostly cloudy

Friday

61 °F

Mostly cloudy and warmer


Partly cloudy

Friday Night

39 °F

Partly cloudy


Mostly sunny

Saturday

66 °F

Mostly sunny


Mostly cloudy w/ t-storms

Saturday Night

43 °F

Mostly cloudy with showers and thunderstorms late


Mostly cloudy

Sunday

72 °F

Mostly cloudy with a thunderstorm in spots in the afternoon


Intermittent clouds

Sunday Night

44 °F

A thunderstorm in the evening; otherwise, becoming clear


Sunrise and Sunset

Sunrise
5:51 AM
Sunset
8:03 PM

Based on AccuWeather data