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The Next Storm/Next Snow Forecast Discussion from the Cherrywood Observatory – August 9th, 2018

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

Forecast Discussion:

The Nebraska storm forecasted yesterday (Tuesday) DID occur and even dropped a near-dawn tornado Wednesday morning. There was plenty of hail in that storm as well (Figure 1). The outflow did make it to the Front Range, but no storms formed here (except some very small midday cells north and south of Estes Park).

We continue to dry out today. The upper level ridge is now centered overhead (Figure 2) so the atmosphere is sinking, making thunderstorms more scarce. Precipitation over the next 48 hours is nearly zero on the northeastern plains of Colorado (Figure 3). The mountains and southern central regions of the state may see something. But not much.

We have a surface high in place as well today (Figure 4). Things are getting quiet.

Checking on last week's drought index (Figure 5) dry conditions are creeping up from the southwest as we go longer and longer without widespread rain.

Figure 1: Radar image from iOS app RadarScope Pro. Longmont is the pink dot.

Figure 2: The 500mb forecast upper air analysis for Thursday PM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.

Figure 3: The total accumulated precipitation between Wednesday PM and Friday noon from the GFS and weather5280.com

Figure 4: The forecast surface map for Thursday PM. From NCEP.

Figure 5: the Colorado drought index map posted a week aga from NOAA NESDIS and NCEI.

The longer range forecast:

The ridge tilts over by the weekend (Figure 6) but we remain quite dry and very close to normal for temperatures all week. We are normally dry and around 89°F this time of year. That is what you'll get!

Figure 6: The 500mb forecast upper air analysis for Sunday AM. Pink dot is Longmont. Red lines are troughs, blue lines are ridges.

Current Weather

Mostly sunny

Mostly sunny

64°F

UV Index
4 Moderate
Pressure
29.59 Steady
Visibility
7 miles
Dewpoint
37 °F
Humidity
37%
Wind
WNW 4.6 mph
Gust
11.2 mph
Wind Chill
64 °F

Hourly Forecast

Today
11 AM
66°F
Cloudy
Today
12 PM
67°F
Cloudy
Today
1 PM
68°F
Mostly cloudy
Today
2 PM
69°F
Mostly cloudy
Today
3 PM
70°F
Mostly cloudy
Today
4 PM
68°F
Mostly cloudy
Today
5 PM
66°F
Cloudy
Today
6 PM
63°F
Thunderstorms
Today
7 PM
59°F
Cloudy
Today
8 PM
56°F
Cloudy
Today
9 PM
53°F
Cloudy
Today
10 PM
51°F
Thunderstorms

7 Day Forecast

Mostly cloudy w/ t-storms

Friday

70 °F

Some sun, then increasing clouds with a couple of thundershowers this afternoon; gusty winds and small hail can accompany any downpour


Thunderstorms

Friday Night

44 °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

47 °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

36 °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

61 °F

Mostly cloudy and warmer


Intermittent clouds

Sunday Night

36 °F

A thunderstorm in spots in the evening; otherwise, 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

Pleasant with sunshine and patchy clouds


Partly cloudy

Tuesday Night

43 °F

Partly cloudy


Sunrise and Sunset

Sunrise
6:06 AM
Sunset
7:51 PM

Based on AccuWeather data