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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – May 27, 2018

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

Forecast discussion:

Change is returning to Colorado as a front (seen in tonight's forecast map in Figure 1) approaches. This map also predicts thunderstorms in the area this afternoon.

Figure 2 shows the next three days graphically for Longmont. There is a 15% chance of thunderstorms today, but an almost 50/50 chance for Monday afternoon.  The higher chances of thunderstorm activity Monday (with temperatures dramatically lowered to the lower 70'sF by the front) runs from roughly noon to 6pm Monday.

Figure 3 is the severe weather outlook for today - and we are in the marginal (1 on a scale of 1-5) today with a slight (2 on a scale of 1-5) just along I-25 and eastward (a large area).

Figure 4 is Monday's (Memorial Day's) outlook, and it is very similar with the slight (2 of 5 scale) maybe just back a bit closer to us. The primary threat of severe weather both days is of hail and high winds.  There is a bit of a better chance of isolated tornadoes in the slight risk area (not too far away!).

Figure 5 is the weather map for Monday morning, with more thunderstorm action behind the front.

Figure 1: The forecast surface analysis map for Saturday PM from NCEP.

Figure 2: the first 3 days of the 10 day graphical forecast for Longmont from weatherunderground.com

Figure 3: the day 2 SPC thunderstorm and severe weather forecast made Saturday (valid Sunday).

Figure 4: the day 3 SPC thunderstorm and severe weather forecast made Saturday (valid Monday).

Figure 5: The forecast surface analysis map for Monday AM from NCEP.

The longer range forecast:

We repeat last week very closely with a chance of afternoon thunderstorms Tuesday and Wednesday as the temperatures rise.  Then we break 90F again and the atmosphere dries out.  Thunderstorms, and a bit of cool down may return at the end of the week.  Nothing TOO notable!

Current Weather

Cloudy

Cloudy

53°F

UV Index
0 Low
Pressure
29.57 Rising
Visibility
8 miles
Dewpoint
22 °F
Humidity
30%
Wind
W 7.3 mph
Gust
19.9 mph
Wind Chill
53 °F

Hourly Forecast

Today
7 PM
52°F
Showers
Today
8 PM
51°F
Mostly cloudy
Today
9 PM
51°F
Intermittent clouds
Today
10 PM
49°F
Intermittent clouds
Today
11 PM
49°F
Partly cloudy
Tomorrow
12 AM
48°F
Mostly clear
Tomorrow
1 AM
47°F
Mostly clear
Tomorrow
2 AM
46°F
Mostly clear
Tomorrow
3 AM
44°F
Mostly clear
Tomorrow
4 AM
43°F
Partly cloudy
Tomorrow
5 AM
43°F
Intermittent clouds
Tomorrow
6 AM
42°F
Mostly cloudy

7 Day Forecast

Showers

Monday

57 °F

Mostly cloudy, breezy and cooler with a few showers


Intermittent clouds

Monday Night

42 °F

Partly cloudy and breezy


Partly sunny w/ showers

Tuesday

60 °F

A couple of showers in the morning; otherwise, windy with times of clouds and sun


Partly cloudy

Tuesday Night

33 °F

Partly cloudy


Intermittent clouds

Wednesday

58 °F

Cool with times of clouds and sun


Mostly cloudy

Wednesday Night

35 °F

Increasing clouds


Partly sunny w/ showers

Thursday

56 °F

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


Cloudy

Thursday Night

43 °F

Cloudy


Mostly cloudy

Friday

62 °F

Mostly cloudy and warmer


Mostly clear

Friday Night

40 °F

Mainly clear


Sunrise and Sunset

Sunrise
5:53 AM
Sunset
8:01 PM

Based on AccuWeather data