Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
000
FXUS65 KBOU 200152
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
752 PM MDT Thu Oct 19 2017

.UPDATE...
Issued at 745 PM MDT Thu Oct 19 2017

Satellite pictures are showing pretty decent cirrus coverage over
the CWA right now. Will modify the GFE Sky cover grids
accordingly. There is no precipitation on the area radars right
now but new leave leave the minor pops going over the high
mountains for later tonight. Temperatures seem okay. Normal
diurnal wind patterns are already in place after sunset.


&&

.SHORT TERM...(This evening through Friday)
Issued at 119 PM MDT Thu Oct 19 2017

GOES WV shows PV center at base of upper trough moving NE over
the four corners region. This will bring a deformation zone over
the state gradually increasing cloud cover through the day. At the
surface light and variable winds through the afternoon with a
boundary setting up from the SW to the NE just south of DIA
bringing increased southerly winds on the plains east of I-25 with
gusts to 25 mph through late evening. Main branch of the trough
will move into the region by Friday morning bringing increased SW
winds. 700mb temperatures are similar to today and with
downsloping off the Palmer you can expect upper 70s for highs over
the urban corridor. Winds will pick up ahead of the trough over
portions of southern Denver and the plains with sustained winds
from 12 to 17 mph and gusts to 30 at times. This will increase
fire weather concerns for drier grass areas on the plains for
tomorrow afternoon.

.LONG TERM...(Friday night through Thursday)
Issued at 119 PM MDT Thu Oct 19 2017

Upper level trof and and associated cold front will move across
northern Colorado Friday night and early Saturday. The main
threats will be a window of snow in the mountains and gusty winds
in the mountains and over the plains. Cross sections show wind of
snow around 06z hour window with increasing northwest orographic
flow and modest amounts of QG upward ascent. Could see amounts of
1-4 inches by early Saturday. Cross sections showing cross barrier
flow increasing to 40-50kt so could see some gusts in up around 60
mph. Strong cold front will also sweep southward over the plains
with gusts up to 40 mph possible. Main changes will be to increase
winds over the mountains and plains from Friday night through
Monday and increase chances of snow Friday night in the mountains.

Cooler on Saturday behind the cold front with highs on the plains
only in the mid to upper 50s. Colorado will remain under a
moderate northwest flow pattern through early next week. There
will be another puff of stronger winds Monday night and Tuesday as
trof sweeps across the northern high plains with associated upper
jet. High pressure aloft will rebuild over the region through
Wednesday with dry and warmer conditions.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
Issued at 745 PM MDT Thu Oct 19 2017

Drainage winds have kicked in already at DIA. Models keep south-
southwesterly winds going all night at DIA with speeds around 10
knots.  There will be no ceiling issues or precipitation.

&&

.FIRE WEATHER...
Issued at 119 PM MDT Thu Oct 19 2017

Fire weather concerns will be heightened for Friday afternoon
between noon and 5 pm. Strong SW winds will move over the Palmer
Divide gusting to 30 in some areas with sustained winds from 15 to
18 mph. RH values will gradually decrease into the upper teens on
the plains. No fire weather highlights at this time.

&&

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

$$

UPDATE...RJK
SHORT TERM...Bowen
LONG TERM...Entrekin
AVIATION...RJK
FIRE WEATHER...Bowen



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.