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10am Update: Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – August 2-3, 2019

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

In Brief:

After rain dumped on a few spots in Colorado Thursday PM, the upper level high reforms over the southwestern U.S. Moisture will still flow into the ridge, but at a lesser rate. Low level winds will return to a northwesterly direction drying things out a bit. We hover around the upper 80'sF and lower 90'sF until a (hinted) return of more moisture next week.

10am Update:

The severe weather predictions yesterday may have been a bit over-done - persistent clouds limited heating needed to push the plentiful moisture up into stronger storms. Still, there were some high wind and hail reports in NE Colorado (Figure 1 update). There is still some deeper moisture (almost 1 inch of precipitatable water) - but the drier air is beginning to flow in from the northwest (orange arrow in Figure 2 update).

Figure 1 update: storm reports to the SPC for Thursday 8/1 nationwide.
Figure 2 update: the water vapor satellite image (browns/reds are dry air, whites and light grey is moist air, purple/blue is ice and high cloud tops). From the the Weather Channel from Thursday.

End 10am Update.

Forecast Discussion:

There was 'some' excitement (thunderstorm-wise) across the state on Thursday (I'll update with interesting storm reports Friday). As the upper level trough of Thursday passes, the high center will reform over the desert Southwest (Figure 2). Moisture will still be fairly abundant for the next few days (Figure 1). For Friday, the severe storm chances reside out in Kansas and Oklahoma, far to our east (Figure 3).

The Longer Range Forecast:

The high will jog towards our state Saturday tamping down the storms some more and warming us to the lower 90'sF - then moisture returns, temperatures drop a few degrees, and afternoon storms return (Figure 4).

Figure 1: the water vapor satellite image (browns/reds are dry air, whites and light grey is moist air, purple/blue is ice and high cloud tops). From the the Weather Channel from Thursday.
Figure 2: The 500mb forecast upper air analysis for Friday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.
Figure 3: The severe storm weather forecast for the U.S. from the Storm Predication Center in Norman, OK. Made Thursday for Friday.
Figure 4: the graphical forecast for the next 10 days for Longmont, CO from weatherunderground.com

Current Weather

Partly sunny

Partly sunny

49°F

UV Index
2 Low
Pressure
29.6 Rising
Visibility
8 miles
Dewpoint
45 °F
Humidity
83%
Wind
NW 2.6 mph
Gust
9.1 mph
Wind Chill
49 °F

Hourly Forecast

Today
9 AM
54°F
Cloudy
Today
10 AM
58°F
Cloudy
Today
11 AM
63°F
Cloudy
Today
12 PM
68°F
Cloudy
Today
1 PM
67°F
Mostly cloudy
Today
2 PM
70°F
Mostly cloudy
Today
3 PM
68°F
Mostly cloudy
Today
4 PM
67°F
Mostly cloudy
Today
5 PM
65°F
Cloudy
Today
6 PM
58°F
Thunderstorms
Today
7 PM
56°F
Thunderstorms
Today
8 PM
55°F
Cloudy

7 Day Forecast

Thunderstorms

Friday

70 °F

Mostly cloudy with a couple of thundershowers this afternoon; gusty winds and small hail can accompany any downpour


Thunderstorms

Friday Night

45 °F

Cloudy; a couple of showers and a thunderstorm this evening followed by periods of rain late; gusty winds and small hail can accompany any downpour


Rain

Saturday

48 °F

Chilly with periods of rain and a thunderstorm; travel in the foothills and mountains will be slippery due to snow


Rain and snow

Saturday Night

39 °F

Cloudy with rain, mixed with a little snow late; travel in the foothills and mountains will be slippery due to snow


Mostly cloudy

Sunday

59 °F

Mostly cloudy and warmer


Partly cloudy

Sunday Night

36 °F

Partly cloudy


Partly sunny

Monday

71 °F

Partly sunny, pleasant and warmer


Partly cloudy

Monday Night

45 °F

Partly cloudy


Mostly sunny

Tuesday

73 °F

Mostly sunny, breezy and pleasant


Partly cloudy

Tuesday Night

43 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:06 AM
Sunset
7:51 PM

Based on AccuWeather data