Saturday, April29, 2017

Marine Weather and Tides
Nunn, CO

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:58AMSunset 7:56PM Saturday April 29, 2017 5:17 AM MDT (11:17 UTC) Moonrise 8:53AMMoonset 11:45PM Illumination 12% Phase: Waxing Crescent; Moon at 3 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Nunn, CO
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location: 40.66, -104.88     debug

Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 291046
area forecast discussion
national weather service denver/boulder co
446 am mdt Sat apr 29 2017

Short term (today and tonight)
issued at 446 am mdt Sat apr 29 2017
light snow has been falling over the front range foothills and
adjacent plains overnight. Snow amounts of 6 to 10 inches have
been received from the foohtills of jefferson and boulder
counties. Accumulations around the denver area and other plains
locations have been in the 2 to 5 inch range. Heavier
accumulations have occurred over the palmer divide where the
upslope winds have been enhanced by the higher terrain.

The heaviest part of the storm is well to our south as the center
of the upper low has set up over northern new mexico. Northeast
colorado has been left on the northern fringes of the storm
system, which will continue that way through tonight. This means
that additional snow accumulations this morning should be light.

By afternoon, snow should be winding down as the storm system
transitions out onto the southern plains. Since the southern front
range foothills and palmer divide have received significant
snowfall overnight, and will continue receiving light to moderate
snow this morning, will let the winter storm warning continue.

The mountains may receive a couple inches of additional snow from
scattered snow shower activity, but it will not be enough to
warrant any highlights, so the winter weather advisories have been
cancelled. A similar condition exists in the denver area and to
the north and northeast. Any additional snow this morning will not
be enough to cause any impacts, so warnings and advisories in
those areas have been dropped.

Improving conditions are expected across the forecast area this
afternoon and evening as the center of the storm system moves into
northern texas and drier air begins filtering into northern
colorado. Clearing skies overnight will allow temperatures to drop
some 5 to 10 degrees cooler than this morning. This will probably
warrant a freeze warning, but will let the current weather clear
out of the region first.

Long term (Sunday through Friday)
issued at 446 am mdt Sat apr 29 2017
a stg storm system will be over cntrl ks Sunday morning and then
will move ene into ia by Sunday night. Some wrap around pcpn may
still affect the far ERN plains Sun morning and then gradually shift
eastward during the aftn. Pcpn will be snow in the morning and
then may switch back to rain by midday. Across the rest of the
area it will be dry except for a slight chc of aftn snow showers
in the mtns. Highs will be mostly in the 50s across the plains
however areas over the far ERN plains may stay in the 40's due to
lingering pcpn and cloud cover.

By Sun night moisture in NW flow aloft will increase in the mtns and
will lead to a good chc of snow due to favorable orographics. In
addition pcpn may be enhanced as rgn will be in left fnt quadrant of
an upper level jet. On Mon moisture will decrease in the mtns in
the morning so snowfall should gradually diminish. By aftn the flow
aloft will be wnw with lapse rates in the 6-7 c/km range. Cross-
sections still show enough moisture for sct showers in the mtns. As
for highs readings across the plains will range from 55 to 60

For Mon night the flow aloft will remain wnw with an upper level jet
overhead. There also could be a wk disturbance moving across
overnight. Cross-sections show more moisture embedded in the flow
with improving lapse rates. Thus may see more snow in the mtns with
a slight chc of showers across the plains.

On Tue an upper level trough in NW flow will begin to affect the
area especially in the aftn thru Tue night. As this feature moves
across there will be decent lapse rates and mid lvl ascent. In
additon axis of upper level jet will put NRN co in favored left fnt
quadrant. Overall should see snow in the mtns Tue aftn into tue
night with potential for heavy snow. Across nern co should see a
good chance of pcpn as well. Soundings show temps will be wrm
enough for rain although pcpn could mix with snow late Tue night
down to 5000 ft.

For Wed there are some differences between the ECMWF and gfs. The
ecmwf has the upper level trough SE of the area by 12z Wed with
considerabe drying. Thus it has pcpn ending before 12z. Meanwhile
the GFS is slower with the upper level trough passage and still has
quite a bit of moisture affecting the area thru Wed morning with
upslope flow. Thus it continues pcpn thru the morning hours. For
now will keep in some pops as not sure about overall timing of the

By Thu and Fri an upper level ridge will build into the rgn with dry
conditions expected along with much warmer temperatures.

Aviation (for the 06z tafs through 06z Saturday night)
issued at 446 am mdt Sat apr 29 2017
ifr conditions will continue this morning as snow continues
falling across the denver area. Snow accumulation rates will be
low, generally less than a quarter inch per hour. After the sun
comes up, the high Sun angle through the clouds will warm pavement
temperatures and keep snow from accumulating. Daytime warming will
also help lift ceilings into the MVFR category by midday. Snow
should be on the decrease during the afternoon hours as the storm
system continues its eastward track. Light snow or flurries may
linger into the early evening, but ceilings will be in the high
MVFR/lowVFR range tonight. Winds will be out of the north today
and then northwest tonight.

Bou watches/warnings/advisories
Winter storm warning until 6 pm mdt this evening for coz036-039-

Short term... Dankers
long term... Rpk
aviation... Dankers

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO16 mi22 minN 59.00 miLight Snow31°F28°F89%1022 hPa
Greeley, Greeley-Weld County Airport, CO21 mi82 minNNE 69.00 miUnknown Precip32°F28°F88%1022.8 hPa

Wind History from FNL (wind in knots)
Last 24hrNE5CalmCalm4S5SE10E8SW8N16N11N7N7NE13NE14NE13NE14NE11NE9--NE5NE7N6NE8N5
1 day agoN3N5N5NE9N7NW4N6NW23
2 days agoS7S7SW5S6SE75S5S6S5Calm5

Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralPlains    EDIT

Wind Forecast for Denver/Boulder, CO (7,2,3,4)
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Ground Weather Radar Station Cheyenne, WY
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.