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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

Cloudy

Cloudy

35°F

UV Index
0 Low
Pressure
30.27 Steady
Visibility
7 miles
Dewpoint
32 °F
Humidity
89%
Wind
E 1.1 mph
Gust
3.3 mph
Wind Chill
35 °F

Hourly Forecast

Tomorrow
12 AM
34°F
Cloudy
Tomorrow
1 AM
34°F
Showers
Tomorrow
2 AM
34°F
Cloudy
Tomorrow
3 AM
34°F
Cloudy
Tomorrow
4 AM
34°F
Mostly cloudy
Tomorrow
5 AM
34°F
Mostly cloudy
Tomorrow
6 AM
34°F
Cloudy
Tomorrow
7 AM
35°F
Cloudy
Tomorrow
8 AM
36°F
Intermittent clouds
Tomorrow
9 AM
37°F
Intermittent clouds
Tomorrow
10 AM
40°F
Intermittent clouds
Tomorrow
11 AM
43°F
Intermittent clouds

7 Day Forecast

Rain and snow

Thursday

37 °F

Cloudy and much colder; snow showers this morning, accumulating a coating to an inch followed by brief showers this afternoon


Mostly cloudy

Thursday Night

34 °F

A shower in spots late this evening; otherwise, mostly cloudy


Mostly cloudy w/ showers

Friday

47 °F

Chilly with some sun, then turning cloudy; a little rain in the afternoon


Rain and snow

Friday Night

33 °F

Periods of snow; rain mixed in early, accumulating an inch or two


Flurries

Saturday

43 °F

A bit of morning snow with little or no accumulation; otherwise, cloudy and chilly; storm total snowfall an inch or two


Intermittent clouds

Saturday Night

31 °F

Partly cloudy


Partly sunny

Sunday

69 °F

Pleasant and warmer with partial sunshine


Partly cloudy

Sunday Night

44 °F

Partly cloudy


Intermittent clouds

Monday

79 °F

Very warm with a blend of sun and clouds


Intermittent clouds

Monday Night

36 °F

Increasing clouds


Sunrise and Sunset

Sunrise
6:17 AM
Sunset
7:43 PM

Based on AccuWeather data