Marine Weather and Tides
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.
|Sunrise 7:12AM||Sunset 6:16PM||Thursday October 18, 2018 2:41 PM MDT (20:41 UTC)||Moonrise 3:35PM||Moonset 1:06AM||Illumination 69%|
7 Day Forecast for Marine Location Near Cherry Creek, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus65 kbou 181636|
area forecast discussion
national weather service denver boulder co
1036 am mdt Thu oct 18 2018
Issued at 951 am mdt Thu oct 18 2018
the central mountains will be the main focus today as a
disturbance over utah and western colorado drifts eastward toward
our CWA this afternoon and evening. Overall, this system is rather
weak with plenty of dry air seen on water vapor extending along
the jet streak from arizona northeastward into nebraska. Infrared
satellite has depicted relatively warm cloud tops overnight and
into this morning although there has been some cooling of the
cloud tops in eastern utah over the past couple of hours. Non-
convective allowing models don't indicate much precipitation from
this system in the mountains but they may not be telling the whole
story. Model soundings indicate that with decent surface warming
and a colder mid-level airmass associated with the disturbance
moving overhead this afternoon, convective showers could develop
south of grand lake to northern park county. Convective allowing
models like the rap and hrrr are picking up on these stronger
showers and have consistently produced maximum QPF values between
0.45 and 0.65 inches in summit and grand counties. I think these
models are likely overdoing the maximum precipitation as they may
not be picking up on the relatively strong inversion seen on the
12z dnr sounding at about 550 mbs. However, this consistent trend
in the high resolution models gives me enough confidence to
increase the pops, qpf, and snow amounts in the central mountains.
Snowfall should be between 1-4 inches above 10,000 feet with
slightly higher values possible in the strongest convective
Otherwise, I have increased high temperatures across the urban
corridor and eastern plains due to the sunshine and downslope
flow. A few showers could sneak into lincoln and washington
counties throughout the morning.
Short term (today and tonight)
issued at 427 am mdt Thu oct 18 2018
today is the day that the weak upper low that has been drifting
over the desert southwest the past few days is forecast to move
over colorado and lose its identity. So far, satellite imagery has
been showing the upper circulation moving northward over eastern
utah with a few weak showers moving over east-central utah and
west-central colorado. The rap model indicates that the upper low
will begin an easterly track during the mid-afternoon hours. The
primary impact will be light shower activity over the central
colorado mountains through this afternoon and evening. Mid and
high level cloudiness will also move over the forecast area
through much of the day. Temperatures should be about the same as
they were yesterday.
Surface pressure charts show a lee trough of low pressure in place
over southeast wyoming and the i-25 corridor. This has created|
some gusty southerly winds over the palmer divide and into the
denver area. Breezy conditions in these areas should continue
this morning and then expand eastward onto the plains as the upper
low from the west slope ejecting across the state produces falling
surface pressures over northeast colorado into this evening. Wind
gusts up to about 25 mph will be possible.
Partly cloudy skies will continue into tonight as the remnants of
the weak upper low make their way eastward. Overnight lows should
be around seasonal normals.
Long term (Friday through Wednesday)
issued at 427 am mdt Thu oct 18 2018
a dry and mild weather pattern will be in place from Friday thru the
weekend. Highs each day will generally be above seasonal normals
with the warmest day on Sunday based on 850-700 mb temps.
By early next week a weak upper level trough will move into the
great basin with southwest flow aloft. Cross-sections show an
increase in mid level moisture on Monday which could lead to a
slight chc of aftn showers in the mtns. Highs will continue a few
degrees above normal.
For Tuesday, a piece of the weak upper level trough may move
across the area, which would increase the chc of showers over the
higher terrain with a slight chc across the plains. By Wednesday
this feature is fcst to be east of the area. Temperatures Tuesday
and Wednesday will remain at or slightly above seasonal normals.
Aviation (for the 18z tafs through 18z Friday afternoon)
issued at 951 am mdt Thu oct 18 2018
vfr conditions will continue through tomorrow afternoon. Moderate
southerly winds will continue into the early afternoon at den and
apa. By around 19z, a weak boundary will drift southward stalling
out around den. Depending on where this boundary decides to
stall, winds may shift to the north at den and may do so for a
couple of hours. We will amend the TAF if confidence increases in
the northerly winds, but right now confidence is low.
A weak disturbance over utah and western colorado will drift
eastward today as showers will develop over the central mountains.
With general downslope flow, these showers should dissipate
before they reach the airports but it is possible one of these
showers reaches bjc and apa. MVFR ceilings and visiblities may be
possible in one of these showers.
Bou watches warnings advisories
short term... Dankers
long term... Rpk
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Denver - Centennial Airport, CO||6 mi||49 min||SW 16 G 26||10.00 mi||A Few Clouds||67°F||27°F||22%||1017.5 hPa|
|Buckley Air Force Base Airport, CO||9 mi||1.7 hrs||S 5||10.00 mi||A Few Clouds||66°F||25°F||21%||1017.5 hPa|
|Denver, Denver International Airport, CO||18 mi||49 min||WNW 6||10.00 mi||A Few Clouds||68°F||27°F||21%||1015.8 hPa|
|Denver Nexrad, CO||20 mi||51 min||WSW 5||10.00 mi||A Few Clouds||68°F||24°F||20%||1021.3 hPa|
|Broomfield / Jeffco, CO||23 mi||1.9 hrs||NNE 6||50.00 mi||Partly Cloudy||64°F||28°F||26%||1022.3 hPa|
Wind History from APA (wind in knots)
|1 day ago||NE||N||NE||E||S||S||SW||S||S||Calm||SE||S||S||S||SE||S||SE||S||SE||SE|
|2 days ago||Calm||N||N||Calm||Calm||S||S||SE||SE||S||S||Calm||S||SE||SE||Calm||Calm||Calm||W||SW||N|
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GOES Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Denver/Boulder, CO (16,3,4,5)(on/off)  Help
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