Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

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FXUS65 KBOU 100127
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
627 PM MST Sat Dec 9 2017

.UPDATE...
Issued at 614 PM MST Sat Dec 9 2017

Only minor adjustments to the ongoing grids. Mostly clear skies
under and dry and subsident airmass overnight.

&&

.SHORT TERM...(This evening through Sunday)
Issued at 312 PM MST Sat Dec 9 2017

Satellite pictures show a few clouds over the CWA at
this time.  Fairly strong northwesterly winds are blowing over most
of the plains.  The airmass in place is very dry. Models keep a
substantial upper ridge over western North America tonight and Sun
day with weak northwesterly flow aloft over the CWA.  Weak downward
synoptic scale motion is progged over the CWA on the QG Omega
fields.  The low level winds should adhere to normal drainage
patterns overnight with the exception of the eastern half of the
plains where northwesterly winds will continue.  There is very
little moisture noted on the cross sections and no measurable
precipitation of the QPF fields.  Will continue with no pops tonight
or Sunday.  Thickness fields point to Sunday`s high temperatures to
be a tad warmer then this afternoon`s highs.

.LONG TERM...(Sunday night through Saturday)
Issued at 312 PM MST Sat Dec 9 2017

The strong upper ridge over the western U.S. is forecast to remain
in place through the week. This will keep dry conditions across
the forecast area with hardly any cloudiness. Temperatures will
also remain warmer than seasonal normals as the flow aloft will be
predominantly out of the northwest. Surface pressure gradients are
expected to increase on Monday as surface high pressure builds
across the northern intermountain region. The increased wind will
combine with the warm temperatures to keep the fire danger
conditions across the plains elevated. High temperatures through
the week will be in the upper 50s and lower 60s, while overnight
low drop into the 20s. Mountain areas will be accordingly cooler.
The next chance for any precipitation over the forecast area
appears to be next Saturday, when an upper trough is expected to
move across the state. Will keep an eye on this feature as later
model runs come in. For now, the chance of snow in the mountains
and slight chance of rain and/or snow on the plains will be
sufficient.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 614 PM MST Sat Dec 9 2017

VFR through Sunday with significant operational impacts.
Southerly drainage winds at KDEN and KAPA tonight, with slightly
stronger westerly winds at KBJC of 15-20 kts. Weak northeasterlies
possible Sunday afternoon.

&&

.FIRE WEATHER...
Issued at 312 PM MST Sat Dec 9 2017

The Red Flag Warning was allowed to expire at 5 pm mst this
afternoon. Relative humidities will come up this evening and the
wind will gradually decrease. The wind will be weaker on Sunday so
critical fire danger conditions are not expected.

&&

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

$$

UPDATE...Cooper
SHORT TERM...RJK
LONG TERM...Dankers
AVIATION...Cooper
FIRE WEATHER...RJK/Cooper



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