Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Nevada, IA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:08AMSunset 4:51PM Saturday November 18, 2017 2:21 AM CST (08:21 UTC) Moonrise 7:02AMMoonset 5:26PM Illumination 0% Phase: New Moon; Moon at 29 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 Nevada, IA
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location: 42.02, -93.46     debug


Area Discussion for - Des Moines, IA
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Fxus63 kdmx 180552
afddmx
area forecast discussion
national weather service des moines ia
1152 pm cst Fri nov 17 2017

Update
Issued at 1151 pm cst Fri nov 17 2017
the dense fog advisory will be allowed to expire at midnight.

Several locations are still at 1 4sm visibility, but conditions
have improved overall and should continue to do so as northerly
winds strengthen and usher in cooler, drier air.

Short term tonight through Saturday
issued at 336 pm cst Fri nov 17 2017
confidence: medium
still some ptype concerns regarding possible overnight changeover to
rain snow mix or completely to snow prior to ending Saturday
morning. 16z subjective sfc analysis shows high building southeast
into the northern plains. A north south cold front and weak waves
just entering west northwest iowa now and a more significant wave
over eastern wyoming eastern colorado western kansas. The southern
waves will combine overnight and tap into moisture plume at h850 sfc
which have been riding northeast toward the central plains in the
past 24 hours. Meanwhile... Rather mild air has also accompanied the
southerly flow with temperatures in the 60s 70s over southeast ne
and kansas respectively. The models are in general agreement for
the southern stream to take control... Pushing the cold front south
through the region overnight. There are very minor differences in
frontal placement by 06z with slightly more significant differences
in both frontal sfc low placement by 12z. The euro NAM are now the
farthest south models by 12z... With the GFS slightly farther north.

All three models continue to suggest a deformation axis on the west
side of the system by 12z... But wit
the remainder of the forecast looks on track and relatively quiet.

Quickly on Sunday warm air will return to the region as an alberta
clipper races across southern canada... Pulling mild air back into
iowa through Monday. Highs are anticipated to rise into the 40s to
mid 50s Monday afternoon. A cold front will drop south with much
colder temperatures with stronger northwest winds Tuesday. With the
gulf of mexico shut off for much of next week... Little moisture will
have any opportunity to return north to the plains. The next quick
clipper moves east Wednesday night into Thursday across southern
canada once again resulting in little sensible weather here with
continued ridging aloft. By Friday h850 temperatures will rise to
the lower teens... With milder air both Thursday night into Friday.

Highs Friday should reach the 40s to 50s once again. H the GFS farther north the
colder air aloft has a better chance of getting ingested into the
system prior to exiting... Resulting in a better opportunity for
either a rain snow mix or complete changeover to light snow aloft
but the GFS also holds onto milder sfc temperatures longer

Resulting in less overall snow reaching the ground (top down
considerations). The NAM is suggesting stronger cold air advection
through the column and hints at complete changeover across the south
by 5-6am... Exiting southeast by 15-17z. The euro is slower today in
bringing the cold air into the system as well as with the farther
south track... Keeps the deformation zone and higher precipitation
production forcing south of our area. SREF soundings suggest a
changeover is at least likely as far south as des moines. Given the
amount of uncertainty and the nature of the this forecast... The fine
details will be ironed out in the next forecast package. For now
will continue to lean toward a mix on the backside of the front with
little if any accumulations. The warm ground today and push of mild
air ahead of the system will help mitigate any accumulations that
might occur. Lows tonight will fall into the lower 30s north into
the upper 30s in the south. Late tonight and tomorrow will be windy
with winds quickly coming up across the area once the system begins
to deepen to our south. Clouds will also be the rule for much of
tomorrow morning gradually clearing in the afternoon hours. Outdoor
activity participants by late afternoon will notice the 20 f to
lower 30 f wind chills over our area between 21-00z as well.

Long term Saturday night through Friday
issued at 336 pm cst Fri nov 17 2017
the remainder of the forecast looks on track and relatively quiet.

Quickly on Sunday warm air will return to the region as an alberta
clipper races across southern canada... Pulling mild air back into
iowa through Monday. Highs are anticipated to rise into the 40s to
mid 50s Monday afternoon. A cold front will drop south with much
colder temperatures with stronger northwest winds Tuesday. With the
gulf of mexico shut off for much of next week... Little moisture will
have any opportunity to return north to the plains. The next quick
clipper moves east Wednesday night into Thursday across southern
canada once again resulting in little sensible weather here with
continued ridging aloft. By Friday h850 temperatures will rise to
the lower teens... With milder air both Thursday night into Friday.

Highs Friday should reach the 40s to 50s once again.

Aviation for the 06z tafs through 06z Saturday night
issued at 1151 pm cst Fri nov 17 2017
lifr conditions are still in place over much of central ia at 06z in
a sw-ne swath with ifr MVFR conditions either side. Visibilities
will continue to slowly improve as northerly winds strengthen, but
ifr ceilings may linger several hours longer. Eventually
conditions will improve toVFR nw-se by late morning but NW winds
will be somewhat gusty before skies clear and winds diminish to
end the period.

Dmx watches warnings advisories None.

Update... Small
short term... Rev
long term... Rev
aviation... Small


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ames, Ames Municipal Airport, IA9 mi29 minNNE 129.00 miOvercast42°F41°F96%1002 hPa
Boone Municipal, IA21 mi27 minN 13 G 186.00 miFog/Mist41°F39°F93%1002 hPa
Ankeny Regional Airport, IA24 mi27 minN 16 G 247.00 miOvercast43°F41°F93%1001.7 hPa

Wind History from AMW (wind in knots)
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Last 24hrSE10SE13SE11SE12SE14SE14SE12SE13
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1 day agoN9N10N7N4N5N4NE7E7SE6SE5SE7E6SE6SE9SE8SE13SE9SE10SE13SE16
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2 days agoW9NW17
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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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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Des Moines, IA (3,6,7,8)
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Ground Weather Radar Station Des Moines, IA
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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.