Monday, September25, 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 7:04AMSunset 7:06PM Monday September 25, 2017 5:25 PM CDT (22:25 UTC) Moonrise 11:20AMMoonset 9:31PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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 252012
afddmx
area forecast discussion
national weather service des moines ia
312 pm cdt Mon sep 25 2017

Short term tonight through Tuesday
issued at 311 pm cdt Mon sep 25 2017
shower and thunderstorm chances will be the main challenge through
the short term forecast period. As of 20z a cold front remains
nearly stationary in western iowa. Temperatures are stuck in the 50s
and 60s behind the front, while those to the east are experiencing
another humid day with temperatures in the 70s and 80s. Weak theta-e
advection over the low-level baroclinic zone in eastern NE western
ia has supported scattered to widespread shower activity for much of
the day. Clearing skies and heating along and to the east of the
front allowed for sufficient destabilization to break the cap. Hi-
res models have struggled to get a handle on the spatial extent and
progression of precip for much of the day, and thus lowers
confidence in their solutions going forward. Isolated to scattered
convection will continue in the warm sector until instability wanes
later this evening. Favorable shear lags behind the front and poor
mid-level lapse rates limit the threat for severe weather, although
brief heavy rainfall is likely as pwats remain anomalously high.

The western CONUS trough will finally begin to break up tonight as a
strong shortwave ejects out of the central rockies. This will give
the sluggish cold front a decent isallobaric shove eastward through
the state. Low level moisture lifted above the frontal axis will
support scattered to widespread precipitation overnight into
Tuesday. Diminishing instability should limit the thunder and heavy
rainfall potential, as most models show little to no MUCAPE left to
work with by 09z Tuesday morning. Model runs today have trended
faster with the progression of the upper level shortwave as it
traverses over the northern plains tomorrow, and thus faster with
deep-layer subsidence and drier air advecting into the area. Pops
were reduced to only slight low chance after 18z, and may still need
to be cut back further. Temperatures will be noticeably cooler and
much more in line with seasonal normals.

Long term Tuesday night through Monday
issued at 311 pm cdt Mon sep 25 2017
the cold front and associated showers and thunderstorms discussed
in the short term section above should clear out of our forecast
area to the southeast by Tuesday night. A cool, dry high pressure
area will then dominate the region Wednesday and Thursday, with
mostly clear skies and temperatures nearly 20 degrees cooler than
this past weekend. A strong mid-level trough will swing
southeastward across the great lakes late Thursday into Friday,
with a reinforcing surface front progressing across iowa around
Thursday night. There is some disagreement among the various model
runs as to the strength and southwestward extent of the mid-level
trough, but nearly all solutions keep associated low clouds and
light showers to our northeast across wisconsin and have
maintained a dry forecast during this period. Behind the
reinforcing front, even cooler and very autumnal weather is in
store for Friday and Saturday, and early Saturday morning lows
may even dip briefly into the upper 30s in a few areas in our
north and east.

By Saturday a broad mid-level trough will have built into the
northwestern u.S., with most of the associated vorticity moving
across the pacific northwest while a leading shortwave pivots
northeastward across the dakotas. The leading wave will probably
have minimal effect on our area, though there is some variability
in the model solutions at that range. Of more consequence, the
larger northwest u.S. Trough will slowly progress eastward and
close off deepen later in the weekend, leading to spotty pops in
the outer forecast periods. However, the details of this evolution
are still murky at this time.

Aviation for the 18z tafs through 18z Tuesday afternoon
issued at 1233 pm cdt Mon sep 25 2017
showers and storms in the vicinity of a slow moving front will
keep tempo and or prevailing MVFR or lower CIGS in place over
northwest and north central iowa through the afternoon hours. The
front will sag further east later today and overnight, which will
bring the chance for more widespread tsra to central iowa
including kdsm. High confidence in ifr or lower CIGS across most
of the area by tonight through Tuesday morning. The potential for
low CIGS and precip are lower in southeast iowa through the
current TAF period, so any flight restrictions remain absent from
the kotm forecast through 12z Tuesday.

Dmx watches warnings advisories None.

Short term... Martin
long term... Lee
aviation... Martin


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ames, Ames Municipal Airport, IA9 mi33 minNNW 104.00 miThunderstorm Light Rain Fog/Mist68°F68°F100%1012.2 hPa
Boone Municipal, IA21 mi31 minN 410.00 miOvercast68°F64°F88%1013.2 hPa
Ankeny Regional Airport, IA24 mi31 minWNW 10 G 189.00 miMostly Cloudy68°F66°F94%1012.5 hPa

Wind History from AMW (wind in knots)
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Last 24hrS10S8SE5S4SE5SE4SE4CalmS3CalmSE3CalmCalmCalmCalmN5CalmNE343N4CalmW25
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1 day agoS7S7SE4SE4SE5S3SE4SE4SE5SE5SE4CalmCalmSE3CalmSE4SE5S8SW9S14
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2 days agoS15S8SE6SE5SE7SE6S6S5SE3SE4SE3S5SE3E3SE5SE4S8S11S12
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S14
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S13

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 (18,4,5,8)
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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.