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6pm Update: Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – May 24-25, 2019

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

In Brief:

The rain showers mostly faded out Thursday night. We return to our regularly scheduled Spring with mild temperatures and only a slight chance of afternoon thunderstorms through the long weekend.

That changes Monday afternoon when a front comes in, kicks off better rain and thunderstorm chances and set us up for another cool and wet week.

Forecast Discussion:

Friday 6pm Update:

I'm going to take a break again this Friday evening - the forecast is on track for a warm weekend with afternoon thunderstorms Sunday and the front arriving 1pm on Monday with a mostly dry and mild BolderBoulder and Memorial day morning. Enjoy the weekend - I'll be back tomorow!

I thought it would be fun to check on our state snow pack after this week of cold precipitation. The SNOTEL graph for Colorado shows us far above the snow-pack of the last 3 years. We are at 252% of normal snow-pack for the state (Figure 1). Little surprise there.

For today (Friday) high pressure moves in as does a ridge (Figure 2) and we pop back into warm dry weather. There is always a chance of afternoon thundershowers moving out onto the plains to blow things around, get you wet, and spook you with a few lightning bolts. Keep an eye to the west each afternoon (Figure 3).

The Longer Range Forecast:

For the BolderBoulder - the forecast is now for temperatures getting into the lower 50's at race start (55F at 8am, an hour later). Skies will be mostly clear and rain chances are very slight. A front comes in in the afternoon and rain chances jump way up at 3pm as rain and thunderstorms form.

We drop to the 60'sF and 50'sF for highs for much of the next week with a wet period Monday afternoon through Wednesday morning. Ah Spring - why won't you stay awhile...?

Figure 1: The snow season trace averaged over all of Colorado. Bright red line is normal. Dark Blue line is 2018-2019. From NRCS and SNOTEL.
Figure 2: The forecast surface map for Friday night from NCEP.
Figure 3: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com
Figure 4: a snippet of the graphical forecast for the next 10 days for Boulder on Monday, CO from weatherunderground.com

Current Weather

Mostly cloudy

Mostly cloudy

53°F

UV Index
0 Low
Pressure
30.1 Steady
Visibility
5 miles
Dewpoint
46 °F
Humidity
79%
Wind
WSW 1.7 mph
Gust
3.3 mph
Wind Chill
53 °F

Hourly Forecast

Today
1 AM
53°F
Mostly clear
Today
2 AM
52°F
Mostly clear
Today
3 AM
51°F
Clear
Today
4 AM
51°F
Clear
Today
5 AM
50°F
Clear
Today
6 AM
49°F
Clear
Today
7 AM
52°F
Sunny
Today
8 AM
58°F
Sunny
Today
9 AM
63°F
Sunny
Today
10 AM
71°F
Sunny
Today
11 AM
76°F
Mostly sunny
Today
12 PM
79°F
Mostly sunny

7 Day Forecast

Partly sunny w/ showers

Sunday

73 °F

Brief morning showers; otherwise, clouds giving way to some sun


Mostly clear

Sunday Night

49 °F

Clear to partly cloudy


Partly sunny w/ t-storms

Monday

86 °F

Partly sunny and warmer; a thunderstorm around in the afternoon


Partly cloudy

Monday Night

52 °F

Partly cloudy


Partly sunny w/ t-storms

Tuesday

72 °F

Times of clouds and sun with a thunderstorm in the afternoon; thunderstorms can bring localized damaging wind gusts


Mostly cloudy

Tuesday Night

50 °F

Increasing clouds


Mostly cloudy w/ t-storms

Wednesday

67 °F

Some sun, then turning cloudy with a couple of thundershowers in the afternoon


Clear

Wednesday Night

50 °F

Clear


Mostly sunny

Thursday

75 °F

Mostly sunny and pleasant


Clear

Thursday Night

47 °F

Clear


Sunrise and Sunset

Sunrise
6:40 AM
Sunset
7:11 PM

Based on AccuWeather data