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Thur Update: The Front Range Forecast: Dense Fog Advisory

In Brief:

Winds and warming temperatures, a small chance of snow/rain early in the week.

Thursday Update.

Issued: 4:51 AM Dec. 14, 2023 – National Weather Service

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM MST THIS MORNING...

* WHAT...Visibility less than a quarter mile in dense fog.

* WHERE...Fort Collins, Boulder and the western suburbs of Denver,
Denver, Castle Rock, and Greeley.

* WHEN...Until 10 AM MST this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

figure1u_12142023
Figure 1 update: the current advisory, watch, and warning map from the NWS and weatherunderground.com

End Thrusday update.

Forecast Discussion:

I called for 0-1 inch around Longmont and we got 2-3 inches last night (Figure 1). My forecast was a bust, but that is more moisture for us (about 0.20 inch).

Winds coming off the Rockies will be pretty high today out on the Plains (Figure 3). With the downslope flow, we'll warm to the 50's Sunday (Figure 2). A cold front arrives Monday evening (blue line) bringing a wimpy chance of precipitation along I-25 (blue dotted box).

figure1_12092023
Figure 1: the 7am snowfall reports from CoCoRaHS for Boulder Co.
figure2_12092023
Figure 2: the 10 day graphical forecast for Longmont from weatherunderground.com
figure3_12092023
Figure 3: the wind speed forecast from the GFS and weathe5280.com for noon Saturday.

The Longer Range Forecast:

Beyond that system, it looks like the weather gets quite quiet with slightly above normal temperatures (Figure 2). Snowfall over the next 5 days will be confined to north central Colorado, central, and southeast Colorado (Figure 4). The precipitation map shows that what does fall will be mainly as snow (Figure 5).

figure4_12092023
Figure 4: the 10:1 snowfall ratio forecast for the next 5 days from the GFS and weather5280.com
figure5_12092023
Figure 5: the precipitation forecast for the next 5 days from the GFS and weather5280.com

 


About the Author: John Ensworth

John Ensworth used to work from Longmont as the PI for the NASA through the IGES (The Institute for Global Environmental Strategies). He now teaches technology, algebra, astronomy, meteorology, film school, and Lego robotics to middle/high school.
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Current Weather

Mostly cloudy

Mostly cloudy

44°F

UV Index
0 Low
Pressure
29.73 Rising
Visibility
8 miles
Dewpoint
40 °F
Humidity
86%
Wind
NNE 5.9 mph
Gust
14.3 mph
Wind Chill
41 °F

Hourly Forecast

Today
9 PM
45°F
Showers
Today
10 PM
45°F
Cloudy
Today
11 PM
45°F
Cloudy
Tomorrow
12 AM
45°F
Cloudy
Tomorrow
1 AM
45°F
Cloudy
Tomorrow
2 AM
45°F
Cloudy
Tomorrow
3 AM
45°F
Cloudy
Tomorrow
4 AM
45°F
Cloudy
Tomorrow
5 AM
45°F
Cloudy
Tomorrow
6 AM
45°F
Cloudy
Tomorrow
7 AM
47°F
Cloudy
Tomorrow
8 AM
52°F
Cloudy

7 Day Forecast

Partly sunny w/ t-storms

Wednesday

74 °F

Cooler with sunshine giving way to clouds, becoming windy this afternoon with heavy thunderstorms; gusty winds and small hail can accompany any downpour


Cloudy

Wednesday Night

45 °F

An evening shower in the area; otherwise, overcast


Intermittent clouds

Thursday

68 °F

Windy with intervals of clouds and sunshine


Mostly cloudy

Thursday Night

46 °F

Overcast in the evening, then partly cloudy late


Intermittent clouds

Friday

73 °F

Beautiful with times of clouds and sun


Mostly cloudy

Friday Night

44 °F

Mostly cloudy


Mostly cloudy

Saturday

75 °F

Mostly cloudy


Intermittent clouds

Saturday Night

45 °F

Clearing


Mostly cloudy w/ showers

Sunday

71 °F

Turning cloudy with a couple of showers in the afternoon


Mostly cloudy

Sunday Night

44 °F

A thunderstorm in parts of the area in the evening; otherwise, mostly cloudy


Sunrise and Sunset

Sunrise
5:46 AM
Sunset
8:08 PM

Based on AccuWeather data