Thursday, June20, 2019 L-36.com


Marine Weather and Tides
Pierce, CO

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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:27AMSunset 8:34PM Thursday June 20, 2019 6:59 AM MDT (12:59 UTC) Moonrise 11:20PMMoonset 8:26AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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 Pierce, CO
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location: 40.66, -104.8     debug


Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 201026
afdbou
area forecast discussion
national weather service denver boulder co
426 am mdt Thu jun 20 2019

Short term (today and tonight)
issued at 426 am mdt Thu jun 20 2019
a short wave trough moving across wyoming helped produce a few
showers and thunderstorms the past few hours. Subsidence behind
the exiting trough is expected to keep it dry this morning.

West-southwest flow aloft will prevail today around an upper
level low over montana. A surface low pressure trough will form
near the foothills today. West of the surface trough, gusty
downslope winds to 50 mph will be possible. The airmass will be
drier here with precipitable values around a half inch. Enough
moisture for high based showers and thunderstorms, but not much of
a heavy rain threat. East of the surface trough moisture will be
better, around three-quarters of an inch. Over the far northeast
corner of colorado, precipitable water will be near and inch. Cape
will be highest to the east as well, with up to 700 j kg across
the area. Main threat with the storms is expected to be gusty
outflow winds. A few severe gusts of greater than 60 mph will be
possible due to the quick storm movement and high bases. Hail up
to one inch in diameter will also be possible over the northeast
corner of colorado. A strong jet from eastern montana, southwest
to the great basin may help with lift today, though the best lift
will be north and west of the area. With the jet and upper level
trough near by will keep a chance for showers and storms in the
forecast through tonight with the higher pops over northern
colorado and across the mountains.

As far as temperatures go, highs will climb to near normal with
readings in the mid 80s across northeast colorado. A mild night is
expected with lows in the 50s over northeast colorado. Moisture
will increase overnight and there may be patchy fog towards
sunrise Friday morning.

Long term (Friday through Wednesday)
issued at 426 am mdt Thu jun 20 2019
looks like things are coming in place for an active end of the
week and weekend. Aloft, a potent late spring upper level low will
be in place over the northern u.S. Rocky mountains with colorado
under brisk southwesterly flow aloft. An upper level jet stream
will rotate around the base of the upper trough and move over
northwestern colorado by Friday afternoon. At the same time, a
surface low will develop and strengthen over western kansas with a
surface cold front moving into northeastern colorado. Low levels
of the atmosphere will moisten through the day Friday and model
soundings show CAPE values increasing to 1500+ j kg. The
convective outlook from the storm prediction center has almost all
of northeast colorad under a slight risk of severe thunderstorms
for Friday afternoon. As Friday afternoon and evening turn into a
round of strong thunderstorms and areas of precipitation, the
airmass will remain moist with northerly flow continuing. This
should spread stratus across the plains overnight. Model cross
sections and soundings show high relative humidities up to almost
600 mb by Saturday morning.

This will get Saturday off to a cool and cloudy start.

Southwesterly flow aloft will continue over the state as the
northern rockies upper low drops short wave energy into the great
basin in the form of a compact upper level closed low. The ecmwf
indicates that his upper low will move across northern colorado
through Sunday morning as it begins to fill. With all the dynamic
forcing moving over the state, the resulting weather will be
unsettled across the forecast area. By Sunday morning,
temperatures aloft are forecast to cool as the upper low moves
over. This may drop snow levels in the mountains down to 10,000
feet or so. Impacts on mountain travel are unclear at this point,
but certainly bears watching. Weather on the plains looks like it
will be unseasonably cool and possibly wet. Run total
accumulations from the ECMWF show more than an inch of rainfall
across the plains by Sunday night. The combination of cool
temperatures in the mountains and precipitation falling as rain or
snow will help keep flows on rivers and creeks in check.

Temperatures on the plains are forecast to only be in the mid and
upper 60s both Saturday and Sunday.

As next week gets started, the upper low will be moving out and an
upper ridge is forecast to build over the southern plains. This
should bring drier and much warmer conditions across the state
through the rest of the week.

Aviation (for the 12z tafs through 12z Friday morning)
issued at 426 am mdt Thu jun 20 2019
vfr conditions are expected to prevail through at least 06z
Friday. Isolated to scattered high based showers and thunderstorms
are expected to form after 21z. Strong outflow winds will be
possible in and near the convection. There should be some wind
shifts after 21z due to the outflows. There will be a good chance
for a period westerly winds gusting to 25 knots or more after 21z.

After 00z, winds will become northeasterly and should remain an
easterly direction through the night. This will increase low level
moisture and could produce fog over parts of eastern colorado. At
this time, appears the fog will stay northeast of the denver
area.

Bou watches warnings advisories
None.

Short term... Meier
long term... Dankers
aviation... Meier


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO18 mi63 minNE 510.00 miFair54°F48°F80%1006.6 hPa
Greeley, Greeley-Weld County Airport, CO18 mi63 minN 010.00 miFair54°F48°F80%1008.2 hPa

Wind History from FNL (wind in knots)
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Last 24hr--S8S8S7SW5E8S555SE9S5SE8SE4S4S4SW6SW7W11N8N8NW9NW6NE12NE5
1 day agoW3N4N4NW3--SW4SW8W5NW5E6NE7N10N6S4CalmSE73--CalmNE4CalmN10N15NW9
G18
2 days agoCalmCalmCalmS5E5E6E5NW5NW8N6N64SW3E11N9N9NW8N7N5N7NE5NE5CalmCalm

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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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.
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Wind Forecast for Denver/Boulder, CO (8,2,3,4)
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Ground Weather Radar Station Cheyenne, WY
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Disclaimer:
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 L-36.com. 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 L-36.com 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.