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Longmont Weather Forecast 6/27-28/2020

In Brief:

Heat with daily afternoon (sometimes a bit strong) thunderstorms will be the story for the next week except for a Tue/Wed cool down and better chance of storms for a day.

Forecast Discussion:

Longmont was mostly skipped by the storms and rainfall Friday.  The rainfall totals across town were around 1/10th of an inch on average (Figure 1 in the gallery above). Boulder received about 1/3rd to 1/2 inch overall. There were many storms in northern Colorado, but a monster storm formed west of Castle Rock and drifted southeast towards Colorado Springs (Figure 2).  It did have a tornado warning on it with a velocity couplet visible on radar inside, but no tornado was reported.  There were many hail reports (circled in red Figure 3) and over an inch was recorded where it tracked.

On Saturday, we have another short wave trough coming in from the west (Figure 3) while we sit in the center of an overall large ridge (giving us the heat/90'sF). We still have moisture around.  This moisture plus really warm air and that short wave will give us a marginal risk of severe weather from I-25 eastward for hail and high winds in the few, widely separated, storms that form (Figure 4).

On Sunday, a short wave ridge will enhance the heat a bit as this trough departs.  The southwest flow aloft (Figure 5) will transport a little bit of smoke and haze up into the state Sunday (Figure 6) but the overall flow from the west and an apparent decrease in fire intensity in Arizona will result in clearer skies Monday (Figure 7).

The Longer Range Forecast:

After roasting in the 90's through Monday we do have a cool down Tuesday and Wednesday to the 80'sF and have a better chance of showers/storms on Tuesday (Figure 8). This change mid-week is caused by a larger trough approaching and passing the state (Figure 9).  Storms for the next 5 days will be scattered and many spots will not see any rain (Figure 10).  Other locations near I-25 will get less than 1/10th of an inch on average.  That lucky storm or two may really dump some water, but you will have to win the "thunderstorm lottery" to see much water fall. 

Independence Day:

We will have a big ridge over most of the U.S. for Independence Day with high in the lower 90'sF and a fair chance of an afternoon thunderstorm. Summer and typical 4th of July weather.

 




Comments

Cloudy

Cloudy

76°F

UV Index
0 Low
Pressure
30.25 Rising
Visibility
10 miles
Dewpoint
51 °F
Humidity
41%
Wind
SSE 4.6 mph
Gust
9.1 mph
Wind Chill
76 °F

Forecast


Partly sunny w/ t-storms

Friday

88 °F

Sunshine mixing with some clouds with a thunderstorm in the area late this afternoon


Intermittent clouds

Friday Night

60 °F

Becoming clear


Partly sunny w/ t-storms

Saturday

89 °F

Intervals of clouds and sunshine with a couple of showers and a thunderstorm in the afternoon


Mostly cloudy

Saturday Night

59 °F

Becoming partly cloudy


Thunderstorms

Sunday

88 °F

Rather cloudy with a shower or thunderstorm in spots in the afternoon


Mostly clear

Sunday Night

58 °F

Clear to partly cloudy


Mostly sunny

Monday

93 °F

Mostly sunny


Mostly clear

Monday Night

58 °F

Mainly clear


Partly sunny

Tuesday

99 °F

Hot with more sunshine than clouds; caution advised if outside for extended periods of time


Mostly clear

Tuesday Night

60 °F

Mainly clear


Sunrise and Sunset

Sunrise
11:36 AM
Sunset
2:33 AM

Based on AccuWeather data