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The Forecast Discussion from the Cherrywood Observatory – May 25-27, 2020

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

In Brief:

With northwest flow aloft for a bit longer, we have one more notable front this week. This front comes through Wednesday afternoon followed by showers overnight into Thursday. After that, we warm up to summer levels with afternoon storm chances. June 1st IS the beginning of meteorological summer (even if June 20th is the start of astronomical summer).

Forecast Discussion:

Let's look backwards before we look forwards. That was a very nice wet storm. Figure 1 shows the actual rainfall pattern for the storm - it matches the GFS's forecast very well. Denver, Boulder, and Colorado Springs were the big winners with over an inch of water. Looking at individual gauges in Boulder county, Longmont saw 0.70 to 1.00 inch across town. Boulder saw around an inch to 1.40 inch - Figure 2.

High pressure settles in for a couple of days (Figure 3) before...

The Longer Range Forecast:

There is one notable cool front coming in Wednesday afternoon. It will only shave about 5 degrees off of temperatures but brings in a chance of showers Wednesday night into Thursday AM. After that, we return to very warm temperatures (hovering around 90F) with afternoon storm chances. It will feel and look a lot like summer.

Note, if all goes well, this will be the last discussion on the Longmont Observer. The next forecast discussion should appear on the Longmont Leader.

Figure 1: the 1 day precipitation observations from NOAA for Colorado ending 7am Monday.
Figure 2 : 24 hour snowfall reports through 7am Monday in Boulder Co. from CoCoRaHS.
Figure 3: The forecast surface map for Tuesday PM from NCEP.
Figure 4: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 5: The 500mb forecast upper air analysis for Wednesday PM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.
Figure 6: precipitation totals through the next 5 days from the GFS and weather5280com for Colorado made Monday AM.

Current Weather

Mostly cloudy

Mostly cloudy

36°F

UV Index
0 Low
Pressure
29.83 Rising
Visibility
8 miles
Dewpoint
29 °F
Humidity
76%
Wind
NNE 1.7 mph
Gust
3.5 mph
Wind Chill
36 °F

Hourly Forecast

Today
7 AM
37°F
Mostly cloudy
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
Today
6 PM
47°F
Mostly cloudy w/ showers

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