Wednesday, April25, 2018

Marine Weather and Tides
Sheridan, CO

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:05AMSunset 7:50PM Wednesday April 25, 2018 12:11 PM MDT (18:11 UTC) Moonrise 2:22PMMoonset 3:03AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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 Sheridan, CO
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location: 39.68, -105.06     debug

Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 251511
area forecast discussion
national weather service denver boulder co
911 am mdt Wed apr 25 2018

Issued at 910 am mdt Wed apr 25 2018
clear skies, light winds, and sunny skies will persist through
this afternoon. Any patchy fog left on the fresh snow cover in
south park will be dissipating within the next hour or so.

Forecast is on track with only a slight nudge down in temps across
south park due to snow cover and shallow inversions there.

Short term (today and tonight)
issued at 319 am mdt Wed apr 25 2018
skies continue to clear out across our area as progressively
drier air works in from the northwest. The surface ridge of high
pressure is across northeast colorado resulting in very light
winds area-wide. There is an outside chance of radiation fog
development given the calm winds, moist ground, and clearing
skies. Best chance would be in the low-lying spots along the south
platte and across the palmer divide. Included patchy to areas of
fog across the palmer divide and south park but opted not to
include elsewhere as confidence is much lower. None of the high
res models develop fog outside of park county and the palmer
divide and goes-16 trends and area mesonets so far do not favor
fog development. Precipitation has ended across the east slopes of
the front range and across park county with the loss of upslope
and advection of drier air. No precipitation is expected through
tonight with dry northwest flow aloft and subsidence on the
backside of the short wave trough that will be over eastern kansas
by midday. Clear skies and light winds should make for a nice day
across our area though we expect haze in the boundary layer
across the i-25 urban corridor. A lack of downslope will temper
the warming today, but we should reach near normal high
temperatures for this time of year, with low to mid 60s plains and
40s to mid 50s in the mountains and west slope.

Tonight will remain dry. Low temps should stay above freezing
below 7000 feet across the plains, with 20s in the eastern foothills,
mountains and west slope. By pre-dawn Thursday a weak short wave
trough in the northwest flow approaches the northeast corner of
colorado. This feature induces a weak surface low across the
nebraska panhandle but on the backside has a decent surface high
moving across wyoming. This pressure gradient will drive a cold
front into the plains of colorado around midnight, reaching the
denver metro area by 2 am, and exiting lincoln county by 4 am. It
should remain dry with the initial frontal passage and north
winds should increase into the 20-30 mph range by sunrise. Details
on impacts to Thursday's weather are below.

Long term (Thursday through Tuesday)
issued at 319 am mdt Wed apr 25 2018
moisture starved system will drop south across the area late
tonight and Thursday in the northwest flow aloft. Northerly winds
will prevail much of the day behind a cold front. Lift from the
upper level trough and low level upslope flow could produce a few
weak showers. Cross sections show best moisture will be over the
area Thursday morning. By early afternoon, there is just a shallow
layer of moisture which will result in mostly cloudy skies
through mid afternoon. Drier air moving in from the north will
bring clearing skies late Thursday. Expect cooler temperatures
with highs in the 50s over northeast colorado.

Warm and dry conditions will prevail Friday as an upper level
ridge moves across the central rockies. This ridge shifts east of
the area this weekend with a southwest flow aloft over colorado.

Warm air will remain in place with highs well into the 70s both
Saturday and Sunday. A few low 80s will be possible, mainly
Sunday. Models agree there will be enough moisture and instability
for afternoon evening showers and thunderstorms, with the best
chance being over the higher terrain. The GFS shows dry air moving
over the area Sunday with no convection, while the ECMWF and
canadian show enough moisture for at least isolated convection, so
forecast remains somewhat uncertain for this weekend regarding
shower thunderstorm chances.

For early next week, a long wave trough will set up over the
western states. Not much agreement with the placement of the short
wave troughs embedded in the long wave trough. Therefore, will
not get too detailed in the forecast. A southwesterly flow should
keep temperatures above normal, though as the long wave trough
progress eastward temperatures should cool. Chances for
precipitation will rely on the smaller features, which remain
uncertain, thus will broadbrush low pops until things become more

Aviation (for the 12z tafs through 12z Thursday morning)
issued at 910 am mdt Wed apr 25 2018
vfr conditions will persist through today with light winds turning
more easterly in the afternoon. Then winds transition back to
normal south southwest this evening.

Cold front with gusty north winds is still on track to arrive by
08z-09z with speeds increasing to 15-20 knots with gusts 25-30
knots for a couple hours. Then winds should relax a bit with
speeds closer to 15g20-25 knots through most of Thursday. Still
expect stratus development behind the front with near MVFR
ceilings 12z-20z Thursday.

Bou watches warnings advisories

Update... Barjenbruch
short term... Schlatter
long term... Meier
aviation... Barjenbruch

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver - Centennial Airport, CO14 mi79 minSSW 310.00 miFair47°F27°F46%1026.6 hPa
Broomfield / Jeffco, CO16 mi85 minSSE 640.00 miClear48°F33°F58%1026.1 hPa
Buckley Air Force Base Airport, CO17 mi74 minW 410.00 miFair48°F27°F46%1025.1 hPa
Erie Municipal Airport, CO23 mi72 minN 010.00 miFair48°F30°F50%1027.8 hPa
Denver, Denver International Airport, CO24 mi79 minSSW 610.00 miFair46°F28°F50%1024.7 hPa

Wind History from APA (wind in knots)
Last 24hrNE8
1 day agoE8CalmN15N14
2 days agoN13N10NW10

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Denver/Boulder, CO (14,3,4,5)
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Ground Weather Radar Station Denver/Boulder, CO
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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.