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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.



Comments

Clear

Clear

71°F

UV Index
0 Low
Pressure
30.06 Steady
Visibility
7 miles
Dewpoint
46 °F
Humidity
40%
Wind
N 0 mph
Gust
6.6 mph
Wind Chill
71 °F

Forecast


Partly sunny w/ t-storms

Monday

92 °F

Sun mixing with clouds, a t-storm in spots in the p.m.; unhealthy air quality for sensitive groups


Partly cloudy

Monday Night

59 °F

Partly cloudy


Partly sunny

Tuesday

96 °F

Partly sunny and very warm


Mostly clear

Tuesday Night

61 °F

Mainly clear


Partly sunny

Wednesday

96 °F

Partly sunny and hot; caution advised if doing strenuous activities outside


Mostly clear

Wednesday Night

57 °F

Mainly clear


Mostly sunny

Thursday

95 °F

Mostly sunny and very warm


Clear

Thursday Night

57 °F

Clear


Sunny

Friday

101 °F

Sunny; caution advised if outside for extended periods of time


Mostly clear

Friday Night

61 °F

Mainly clear


Sunrise and Sunset

Sunrise
11:38 AM
Sunset
2:32 AM

Based on AccuWeather data