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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

Partly cloudy

Partly cloudy

69°F

UV Index
0 Low
Pressure
30.14 Steady
Visibility
12 miles
Dewpoint
60 °F
Humidity
73%
Wind
NW 3.2 mph
Gust
4.3 mph
Wind Chill
69 °F

Hourly Forecast

Tomorrow
12 AM
67°F
Mostly cloudy w/ showers
Tomorrow
1 AM
65°F
Partly cloudy
Tomorrow
2 AM
64°F
Mostly clear
Tomorrow
3 AM
62°F
Clear
Tomorrow
4 AM
61°F
Clear
Tomorrow
5 AM
60°F
Clear
Tomorrow
6 AM
58°F
Sunny
Tomorrow
7 AM
62°F
Sunny
Tomorrow
8 AM
68°F
Mostly sunny
Tomorrow
9 AM
74°F
Mostly sunny
Tomorrow
10 AM
80°F
Mostly sunny
Tomorrow
11 AM
84°F
Mostly sunny

7 Day Forecast

Intermittent clouds

Saturday

82 °F

Clouds giving way to sun; high levels of ozone will lead to poor air quality


Mostly clear

Saturday Night

58 °F

A shower in spots late this evening; otherwise, clear to partly cloudy


Partly sunny w/ showers

Sunday

94 °F

Partly sunny with a passing shower in the afternoon


Partly cloudy

Sunday Night

61 °F

Partly cloudy


Mostly cloudy w/ t-storms

Monday

94 °F

Some sun, then increasing clouds with a thundershower in spots in the afternoon


Mostly clear

Monday Night

60 °F

Clear to partly cloudy


Intermittent clouds

Tuesday

92 °F

Sun through high clouds


Partly cloudy

Tuesday Night

60 °F

Partly cloudy


Intermittent clouds

Wednesday

81 °F

Not as warm with times of clouds and sun; a thunderstorm in spots in the afternoon


Intermittent clouds

Wednesday Night

58 °F

An evening thunderstorm; otherwise, partly cloudy


Sunrise and Sunset

Sunrise
5:41 AM
Sunset
8:30 PM

Based on AccuWeather data