Monday, February19, 2018 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 7:01AMSunset 5:54PM Monday February 19, 2018 1:25 PM CST (19:25 UTC) Moonrise 9:12AMMoonset 9:54PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Nevada, IA
   Hourly   EDIT   Help
location: 42.02, -93.46     debug


Area Discussion for - Des Moines, IA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kdmx 191747
afddmx
area forecast discussion
national weather service des moines ia
1147 am cst Mon feb 19 2018

Update
Issued at 845 am cst Mon feb 19 2018
updated forecast to reflect areas of fog over portions of
southwest and eastern iowa. Fog tied to lighter winds and low
pressure near des moines at this time... With moisture convergence
along the frontal boundary and trough sitting across the region.

The low will slowly move northeast this morning resulting in a
shift of the thicker fog to near the highway 20 30 corridor mainly
east of i35. Rev

Short term today through Tuesday
issued at 324 am cst Mon feb 19 2018
very active period with broad southwest flow aloft and frontal
boundary positioned across the state. Front has progressed to
mason city to atlantic to nebraska city early this morning with
temperatures now around 20 in northwest iowa. South of the front,
temperatures remain mostly in the 40s with dewpoints climbing as
moisture returns. Returns are increasing on radar along with
precipitation reports from automated sites in western iowa. Will
continue to see the expansion of precipitation with strong warm
and moisture advection over the next few hours ahead of an
approaching shortwave. Anticipate deteriorating conditions in
advisory area with expansion of freezing drizzle and light
freezing rain. Meanwhile, showers and even a few storms remain
likely along and east of the boundary this morning as weak
instability moves into the state.

Forcing is expected to wane in the west by late morning and expand
east northeast through the afternoon. Therefore, much of the
accumulating precipitation is expected to end by this afternoon
over much of the forecast area. There will be some remaining
patchy freezing drizzle behind the boundary with the threat of
scattered showers and a few storms near the front into the
afternoon. Icing amounts across the north today will likely be
around 0.10" with some amounts near 0.15".

A renewed push of warm advection and moisture surge will occur
tonight across much of iowa ahead of the next shortwave. Much of
the forecast area will see freezing drizzle freezing rain with an
impressive warm layer above shallow polar airmass. If anything,
this push is a bit slower than initially thought with the bulk of
precipitation falling from 06z-12z across the forecast area. There
will be a tight gradient on the east side between fzra ra near a
tama-knoxville-lamoni line. Just west of this line, amounts of
0.20" are expected and will impinge upon 0.25" by the end of the
event and will have to be cognizant of warning potential. For now,
have gone with an advisory for much of the area tonight into
Tuesday morning. Forcing will be subsiding quickly on Tuesday with
the passage of the shortwave and precipitation will be confined to
the far southeast by midday as drier air enters the state.

Long term Tuesday night through Sunday
issued at 324 am cst Mon feb 19 2018
the early week winter storm will move away on Tuesday, yielding a
brief quiet but cool period from Tuesday night into Wednesday night
as a high pressure area moves across the region. However, a broad
t500 mb trough will remain anchored across the western u.S.

Keeping iowa beneath southwesterly steering flow aloft. By
Wednesday night the next storm system will approach through the
flow, in the form of a compact shortwave generating a reflective
surface cyclone that will pass through the region Thursday and
Thursday night. This will result in precipitation in or near our
forecast area, but precipitation type is very much in question due
to dry air layers in the column. Forecast soundings have shown a
high degree of variability with respect to saturation depth and
degree of ice crystal introduction but it seems likely we will see
some combination of rain, snow, and freezing rain drizzle within
our forecast area. The details of timing and location with this
precipitation is very uncertain at this time but we will be t
monitoring it over the next several days. Later in the week we
will see a repeat of this pattern with another brief break around
Friday Friday night followed by yet another modest storm system
around Saturday as much of the energy in the western u.S. Trough
finally kicks out and crosses the midwest. This will likely yield
more precipitation around Saturday, followed by somewhat quieter
weather toward the latter part of the weekend and into early next
week. In terms of temperature the southwesterly flow will prohibit
any large temperature swings from Thursday onward, with highs
generally in the 30s and 40s and lows in the teens and 20s. Thus
the time of day will also play a large role in precipitation types
with both the Thursday and Saturday systems.

Aviation for the 18z tafs through 18z Tuesday afternoon
issued at 1147 am cst Mon feb 19 2018
fzdz expected to continue across the north with some dz rain
showers in the east south this afternoon. Vsbys and CIGS very low
in the lifr to ifr categories for much of the period. Some lighter
precip expected into the evening, if not even a small dry period
with widespread freezing precipitation expected late tonight into
early Tuesday am. Kotm will remain above freezing with mainly rain
showers expected. Some instability aloft could result in thunder
at nearly all sites, but uncertainty too much to mention at this
time.

Dmx watches warnings advisories
Winter weather advisory from 9 pm this evening to noon cst
Tuesday for iaz027-028-037>039-048>050-059>062-070>074-081>084-
092>094.

Winter weather advisory until noon cst Tuesday for iaz004>007-
015>017-023>026-033>036-044>047-057-058.

Update... Rev
short term... Cogil
long term... Lee
aviation... Beerends


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ames, Ames Municipal Airport, IA9 mi32 minN 91.75 miFog/Mist34°F33°F97%1005.6 hPa
Boone Municipal, IA21 mi30 minno data0.75 miFog/Mist32°F32°F100%1005.1 hPa
Ankeny Regional Airport, IA24 mi30 minNW 101.50 miFog/Mist36°F33°F93%1005.8 hPa

Wind History from AMW (wind in knots)
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last 24hrS13
G21
S10S17
G26
CalmSE3S4S8SE7S7SE6SE5CalmSE4SE5SE4NW6N6NW6N9N11N10N8N12N9
1 day agoNW18NW11NW13NW12W7W7NW9NW7SW5CalmCalmS3CalmS3SE5SE6SE10SE9SE12SE9S17S17
G26
S20
G30
S27
G39
2 days agoW7SW3W6S7S5S5SE5S7SE8SE6S7SE5SE6SE6SE4SE5SE7SE4SE6SE5S4SW7W10W14

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Des Moines, IA (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Des Moines, IA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.