Johnstown, Colorado 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

563
FXUS65 KBOU 051801
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
1201 PM MDT Sun Apr 5 2026

.KEY MESSAGES...

- Dry through Monday with a chance of light showers late day
  Tuesday and Wednesday.

- Elevated to critical fire weather conditions over the plains
  Wednesday afternoon.

- Unsettled weather pattern Friday through Monday.

&&

.DISCUSSION /Through Saturday/...
Issued at 1126 PM MDT Sat Apr 4 2026

Skies are clear across the forecast area at this time.  Winds are
mainly light from the south and southeast across the plains with
temperatures in the mid 30s to lower 40s.

Upper ridging aloft west of Colorado is progged to push slowly
eastward through Sunday on into the CWA by Monday morning as it
flattens out. Weak west-northwesterly flow aloft is expected over
the CWA tonight through Tuesday. Upper troughing is progged to
move in late Tuesday into Wednesday with increasing west-
northwesterly flow aloft. This will bring a cold front across the
plains Tuesday night.

The QG Omega fields show benign synoptic scale energy over the
forecast area from now through Tuesday night, with some upward
energy progged late Tuesday night and Wednesday.

Moisture is sparse for the CWA overnight tonight through Monday with
just some upper level cloudiness here and there. Cross sections
show moisture deepening somewhat Monday night and Tuesday. There
may be enough instability around later Monday, Tuesday and late
day Wednesday to warrant a 20-50% chance of showers. Chances will
be highest in the mountains. Significant precipitation is not
expected.

Humidity levels will drop into the 12-20 percent range Wednesday
afternoon.  Winds gust speeds will be around 20 knots so elevated to
near critical fire weather conditions are expected for a few hours
mainly over the plains.

Temperatures look to be running a bit above normals Sunday through
Tuesday, with highs in the 60s over the plains all three days.
Wednesday`s highs could be a tad more than 10 degrees above seasonal
normals reaching the lower 70s on the plains.

For the later periods, Thursday through Sunday, southwesterly
flow aloft is progged on Friday through Sunday with upper troughing
in play for Monday. Confidence is low by the end of the period with
various medium range models in poor agreement.

&&

.AVIATION /18Z TAFS through 18Z Monday/...
Issued at 1156 AM MDT Sun Apr 5 2026

VFR conditions through the TAF period. Overall light winds through
tomorrow (<12 kts) with light and VRB winds transitioning to ESE
in the next hour as flow becomes more organized. Winds should
become more east later this afternoon before returning to drainage
by 07Z-10Z. For tomorrow, expect a gradual transition from
drainage to a light northeast by 17Z/18Z before a backdoor cold
front brings in stronger easterly flow of around 15 kts by 22-23Z.
No ceiling issues expected.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...66
AVIATION...MAI