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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

Mostly clear

Mostly clear

73°F

UV Index
0 Low
Pressure
30.04 Steady
Visibility
8 miles
Dewpoint
49 °F
Humidity
42%
Wind
SW 2.2 mph
Gust
4.4 mph
Wind Chill
73 °F

Hourly Forecast

Today
11 PM
70°F
Mostly cloudy w/ t-storms
Tomorrow
12 AM
68°F
Intermittent clouds
Tomorrow
1 AM
67°F
Mostly clear
Tomorrow
2 AM
65°F
Mostly clear
Tomorrow
3 AM
64°F
Mostly clear
Tomorrow
4 AM
63°F
Mostly clear
Tomorrow
5 AM
62°F
Mostly clear
Tomorrow
6 AM
61°F
Mostly sunny
Tomorrow
7 AM
64°F
Mostly sunny
Tomorrow
8 AM
70°F
Mostly cloudy
Tomorrow
9 AM
76°F
Mostly cloudy
Tomorrow
10 AM
81°F
Mostly cloudy

7 Day Forecast

Mostly cloudy

Sunday

95 °F

Turning cloudy


Partly cloudy w/ t-storms

Sunday Night

61 °F

A thunderstorm in spots late this evening; otherwise, partly cloudy


Mostly cloudy

Monday

94 °F

Mostly cloudy


Partly cloudy

Monday Night

62 °F

Partly cloudy


Partly sunny w/ t-storms

Tuesday

91 °F

Intervals of clouds and sun, turning breezy in the afternoon with a thundershower in spots


Mostly clear

Tuesday Night

62 °F

A thunderstorm in spots in the evening; otherwise, mainly clear


Partly sunny w/ t-storms

Wednesday

85 °F

Clouds and sun with a strong thunderstorm in spots in the afternoon; thunderstorms can bring hail and damaging winds


Mostly clear

Wednesday Night

59 °F

Mainly clear


Mostly cloudy

Thursday

84 °F

Turning cloudy


Partly cloudy w/ t-storms

Thursday Night

58 °F

A couple of evening thunderstorms; otherwise, turning out clear


Sunrise and Sunset

Sunrise
5:48 AM
Sunset
8:26 PM

Based on AccuWeather data