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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – August 8th, 2018

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

Forecast Discussion:

The big storms formed, were far apart (on Tuesday), and dumped serious hail on a few locations. Longmont dodged a big one around 5pm Tuesday (Figure 1).

The atmosphere continues to dry out at most levels (low level moisture kept Tuesday storms alive).  The red and black colors are atmospheric columns are low on moisture content in Figure 2.  The GFS is forecasting little rain over the next 48 hours (Figure 3).  Both this model and the one used Tuesday morning on Channel 7 news had storms up in Nebraska send a gust front back to the Front Range today that initiated a big storm around Fort Collins.  That will be interesting to see if it occurs.

Figure 1: Radar image from iOS app RadarScope Pro posted on Twitter by Matt Makens

Figure 2: the water vapor satellite image from Tuesday night. Reds/Oranges are dry air, greys/whites are moist air regions.

Figure 3: The total accumulated precipitation between Tuesday PM and Thursday late PM from the GFS and weather5280.com

The longer range forecast:

The 10 day forecast has a chance of a storm Wednesday (our storm from above?) then very little but a few afternoon storms in afternoon by the weekend and beyond. Temperatures change very little and hover in the upper 80's F throughout the forecast period (Figure 4).

As an interesting note, we have four tropical systems between Mexico and Hawaii (Figure 5). As Joe Bastardi from WeatherBell says, you get a "Ridge over Troubled Water."  There has been a big ridge over the southwest for a long time, so this makes sense. What is even more interesting is that the eastern two-most storms (Llena and John) might merge in a few days.  I've seen tropical system dance around one another, but I've not seen two merge (Figure 6).

Figure 4: the next 10 days of the graphical forecast for Longmont, CO from weatherunderground.com

Figure 5: The hurricane lineup Tuesday in the western Pacific. From the National Hurricane Center.

Figure 6: Hurricane John impacted Tropical Storm Ileana on Tuesday, bringing rough surf conditions and heavy rain to the coast of Baja California. Forecast winds speeds. National Hurricane Center.

Current Weather

Sunny

Sunny

44°F

UV Index
3 Moderate
Pressure
30.02 Steady
Visibility
8 miles
Dewpoint
27 °F
Humidity
50%
Wind
SSE 3.7 mph
Gust
8.4 mph
Wind Chill
42 °F

Hourly Forecast

Today
9 AM
47°F
Sunny
Today
10 AM
51°F
Mostly sunny
Today
11 AM
55°F
Mostly sunny
Today
12 PM
58°F
Mostly sunny
Today
1 PM
60°F
Partly sunny
Today
2 PM
62°F
Intermittent clouds
Today
3 PM
63°F
Mostly cloudy
Today
4 PM
65°F
Mostly cloudy
Today
5 PM
63°F
Cloudy
Today
6 PM
62°F
Cloudy
Today
7 PM
59°F
Mostly cloudy
Today
8 PM
56°F
Mostly cloudy

7 Day Forecast

Mostly cloudy

Thursday

65 °F

Becoming cloudy


Mostly cloudy

Thursday Night

36 °F

Mostly cloudy


Partly sunny

Friday

70 °F

Partial sunshine


Partly cloudy

Friday Night

38 °F

Partly cloudy


Partly sunny

Saturday

66 °F

Partial sunshine


Mostly clear

Saturday Night

41 °F

Clear to partly cloudy


Mostly cloudy

Sunday

76 °F

Rather cloudy; breezy in the afternoon


Intermittent clouds

Sunday Night

43 °F

Partly cloudy


Cloudy

Monday

60 °F

Cloudy and cooler with a shower in spots; windy in the afternoon


Mostly cloudy

Monday Night

43 °F

Breezy in the evening; otherwise, mostly cloudy


Sunrise and Sunset

Sunrise
5:58 AM
Sunset
7:57 PM

Based on AccuWeather data