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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – June 12, 2018

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

Forecast Discussion:

Dry and cooler continues today. Figure 1 shows the departed cold front Monday PM.  Other than smoke, the skies are Colorado-clear. Speaking of smoke, the large fires in the south are pouring out copious amounts of smoke, but the haze around here Monday and today is actually coming from new fires in central Utah (Figure 2).

The upper air pattern for tonight shows the big ridge sitting to our west keeping us high and dry.

Figure 1: The forecast surface map for this afternoon. From NCEP.

Figure 2: The HRRR model forecast for smoke at all levels for midday Tuesday. From NOAA.gov

Figure 3: The 500mb upper air forecast map for Tuesday PM from the GFS and tropicaltidbits.com. Ridges are blue lines, troughs are red lines.

The longer range forecast:

The ridge is still in place tomorrow, but has slid across the state with its central axis just barely to our east (Figure 4).  From this , we see very little weather but rapidly warming temperatures through Thursday (Figure 5). Down in the bottom of figure 4 is an interesting feature - hurricane Bud (oh what a terrifying name).

Figure 5 is the NHC's forecast of storm intensity and direction.  It currently has winds at 120mph making it a category 3 storm headed north-ish (Figure 6).  Figure 7 is the weather map for Friday PM and Bud is coming inland in northern Mexico.  Moisture is already streaming ahead of it into Colorado.  Figure 8 has a lee trough in NE Colorado and a lot of moisture from Bud nearby.  This could be interesting! Going back to Figure 5, afternoon heating will combine with Bud's moisture for Friday afternoon storms.  Saturday and Sunday will see more moisture around.  After that, a stream of Gulf of Mexico moisture seems to get drawn into Colorado with rain showers for the beginning of next week.  Relief *may* be in sight!

Figure 4: The 500mb upper air forecast map for Wednesday PM from the GFS and tropicaltidbits.com. Ridges are blue lines, troughs are red lines.

Figure 5: the total 10 days of the graphical forecast for Longmont, CO from weatherunderground.com

Figure 6: The National Hurricane center prediction for the future position and strength of hurricane Bud. From weatherunderground.com

Figure 7: The future weather map from the GFS and tropicaltidbits.com valid Friday PM.

Figure 8 The future weather map from the GFS and tropicaltidbits.com valid Saturday PM.

Current Weather

Mostly cloudy

Mostly cloudy

39°F

UV Index
0 Low
Pressure
30.2 Steady
Visibility
7 miles
Dewpoint
31 °F
Humidity
72%
Wind
SE 1.6 mph
Gust
3.7 mph
Wind Chill
39 °F

Hourly Forecast

Today
3 AM
39°F
Showers
Today
4 AM
38°F
Partly cloudy
Today
5 AM
38°F
Partly cloudy
Today
6 AM
37°F
Partly sunny
Today
7 AM
39°F
Partly sunny
Today
8 AM
42°F
Mostly sunny
Today
9 AM
45°F
Mostly sunny
Today
10 AM
49°F
Mostly sunny
Today
11 AM
53°F
Mostly sunny
Today
12 PM
55°F
Mostly sunny
Today
1 PM
59°F
Mostly sunny
Today
2 PM
61°F
Partly sunny

7 Day Forecast

Mostly cloudy w/ showers

Friday

76 °F

Some sun, then increasing clouds, becoming breezy in the afternoon with a shower in spots late


Partly cloudy w/ showers

Friday Night

37 °F

Partly cloudy with a couple of showers


Partly sunny

Saturday

66 °F

Partly sunny and not as warm


Mostly clear

Saturday Night

40 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Mostly cloudy and warmer; breezy in the afternoon


Mostly cloudy

Sunday Night

47 °F

Rather cloudy; breezy late


Windy

Monday

60 °F

Very windy; cloudy and cooler


Intermittent clouds

Monday Night

43 °F

Partly cloudy


Intermittent clouds

Tuesday

62 °F

Windy with times of clouds and sun


Partly cloudy

Tuesday Night

36 °F

Partly cloudy


Sunrise and Sunset

Sunrise
5:57 AM
Sunset
7:58 PM

Based on AccuWeather data