Area Forecast Discussion
Issued by NWS Denver/Boulder, CO

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FXUS65 KBOU 172109
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
309 PM MDT Mon Jul 17 2017

.SHORT TERM...(This afternoon through Tuesday)
Issued at 300 PM MDT Mon Jul 17 2017

Light westerly flow is pushing into the area as a broad high
pressure lies over the southern Rockies. Isolated to scattered
convection over the mountains will continue barely making out over
the plains, except over the northern plains where outflow will
likely spread across the plains. Eastern plains are expected to
remain dry. A shortwave over far southwestern Wyoming is expected
to bring another round of showers and thunderstorms to the high
country at least later this evening, though activity will likely
be done by midnight. Left over clouds from this activity as well
as warm advection from the west will keep low temperatures
moderated tonight.

Tuesday will be slightly warmer, and drier mainly over the
northern half of the forecast area where lower PWs will be moving
in. Once again, afternoon storms over the mountains will barely
make it over the plains in the afternoon, but if they do there
will be more wind than rain.

.LONG TERM...(Tuesday night through Sunday)
Issued at 300 PM MDT Mon Jul 17 2017

The broad high pressure ridge aloft will be in the process of
shifting east of Colorado and into the central plains states
through the end of the week, especially by Thursday and Friday.
This pattern will help to steer additional moisture into Colorado
from the desert southwest and across the northeast plains by
Thursday evening and Friday. Convection may be aided by a weak
front and upper trof by stronger energy moving into the northern
Rocky mountain region. Should see additional cooling by Friday
behind the front.  Almost like last weekend, a very weak low
aloft slowly moves through the mean ridge position and drifts
across Colorado through the weekend and early next week with with
decent chances for precip. Temperatures will at least cool to near
seasonal high temperatures or even a bit below normal.

Unfortunately the long range models are building the ridge back
westward towards Tuesday and Wednesday of next week with dry and
warming conditions.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 300 PM MDT Mon Jul 17 2017

VFR through Tuesday morning. Isolated storms over the higher
terrain are expected to only impact the airports with outflow
winds, mainly between 22-01z, with speeds less than 30 knots. Most
models have the outflow originating out of the Boulder to Larimer
County areas, spreading southeast. Northerly winds will
eventually become drainage tonight, veering around the west then
north Tuesday morning to become easterly tomorrow.

&&

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

$$

SHORT TERM...Kriederman
LONG TERM...Entrekin
AVIATION...Kriederman


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