Sunday, August20, 2017

Marine Weather and Tides
Merriam, KS

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 6:36AMSunset 8:07PM Sunday August 20, 2017 4:05 PM CDT (21:05 UTC) Moonrise 4:15AMMoonset 6:31PM Illumination 2% Phase: Waning Crescent; Moon at 28 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 Merriam, KS
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location: 38.98, -94.7     debug

Area Discussion for - Kansas City/Pleasant Hill, MO
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Fxus63 keax 202102
area forecast discussion
national weather service kansas city pleasant hill mo
402 pm cdt Sun aug 20 2017

Issued at 401 pm cdt Sun aug 20 2017
short term (tonight through Tuesday):
the main concerns in the short term will be for the chance for
severe weather tomorrow evening as well as the chance for flash
flooding Monday night into Tuesday morning.

This afternoon thunderstorms have persisted along an outflow
boundary north of i-70. These storms will continue to weaken through
late afternoon into the evening. Upper level ridging that has helped
to bring warm temperatures to the area today will be in place
tonight. A shortwave is expected to round to round the upper level
ridge and move through iowa. A nocturnal LLJ will increase tonight
and nose right into central iowa. A MCS is expected to develop
across iowa tonight with the southern periphery affecting northern
missouri. Tomorrow morning, the LLJ will weaken at begins to veer
into the local area. This may continue the chance for widely
scattered showers and thunderstorms through the morning hours.

Although a fair amount of cloud is expected tomorrow with southerly
flow and upper level ridging over the area, highs will still reach
the upper 80s to lower 90s.

Late tomorrow afternoon, an outflow boundary from the morning mcs
will be laid out across the CWA and may be the focus for afternoon
convection. NAM soundings suggest 2000-3000j kg of MUCAPE and
effective shear of 30-35kts. This would be supported of some severe
storms capable of large hail and damaging winds. Pinning down the
location for these storms will be difficult since much will hinge on
where outflow boundaries set up. Tomorrow night, a upper level
trough will move from the plains into the upper midwest forcing a
cold front into the area. Extremely moist air will be in place as it
does as a pacific monsoonal moisture plume will be rounding the
upper level ridge(it already is) and be focused on the local area.

Also, Monday night, the nose of a 40-45kt southwesterly LLJ will be
focused right over the metro with pwat values 3 to 4 standard
deviations above normal between 2.00"-2.30" in place. This may lead
to prolonged heavy rainfall over the area and as such a flash flood
watch has been issued for most of the cwa. On Tuesday morning the
llj finally veers off to the south of the CWA and precipitation
should weaken and shift south of the CWA as the cold front finally
moves through. Expect highs in the low to mid 80s behind the cold

The eclipse (Monday) : see below
long term (Tuesday night to Saturday):
beyond Tuesday, conditions look benign through the remainder of the
week as surface high pressure builds into the area Tuesday night and
remains entrenched over the area through Thursday night. High
Wednesday and Thursday will be in the upper 70s to lower 80s. Friday
we get a return to southerly flow as the surface high shifts
eastward. This will allow temperatures to warm a couple degrees into
the lower 80s. The next chance for storms won't come until Saturday
will the next system approaches the area.

Specifics for the total solar eclipse on august 21st
Issued at 401 pm cdt Sun aug 20 2017
unfortunately, it continues to look like there will be broken to
overcast cloud cover from late morning through early afternoon. A
pacific moisture plume is evident on the water vapor satellite
imagery today and this will continue into tomorrow bringing a cirrus
shield into the area. Also, with a weak low level jet impinging on
the area, there will be the chance for widely scattered showers and
thunderstorms during the late morning and early afternoon hours.

However, even if we remain dry a fair amount of mid-level clouds
will also be affecting the area. There will be some areas where the
sky will not be completely obscured however, they may be few and far

Aviation (for the 18z tafs through 18z Monday afternoon)
issued at 1258 pm cdt Sun aug 20 2017
showers and thunderstorms are developing north of the terminals
this afternoon and should remain north this afternoon.

Otrw... Conds should remainVFR through the TAF pd with sct-bkn
high clouds. There may be a few showers in the area this morning
however, confidence is too low at this time for inclusion in the
taf. Winds will be out of the sse and veer to the ssw by tomorrow
morning btn 8-15kts.

Eax watches warnings advisories
Ks... Flash flood watch from Monday evening through Tuesday morning
for ksz025-057-060-102>105.

Mo... Flash flood watch from Monday evening through Tuesday morning
for moz012>016-020>024-028>032-037>039-043>045-053-054.

Discussion... 73
aviation... 73
eclipse... 73

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Olathe, Johnson County Executive Airport, KS9 mi73 minESE 710.00 miA Few Clouds86°F75°F70%1014.5 hPa
Kansas City, Kansas City Downtown Airport, MO11 mi72 minSE 510.00 miFair89°F70°F53%1014.6 hPa
Olathe, New Century Aircenter, KS14 mi73 minE 810.00 miFair88°F73°F61%1014.4 hPa
Lee's Summit, Lee's Summit Municipal Airport, MO17 mi73 minESE 910.00 miFair87°F73°F63%1015.2 hPa
Kansas City, Kansas City International Airport, MO24 mi73 minE 910.00 miPartly Cloudy87°F71°F59%1015.2 hPa

Wind History from OJC (wind in knots)
Last 24hrS7S8S8SE5SE5S3S5S6S6S6S6S7S6N22
1 day agoSW7SW6SW5S3S4S3CalmS3S3S4SW3S3NW3S3CalmCalmN4N33CalmCalmS4S4S5
2 days agoW9W8W5SW4SW4SW3SW4CalmSW3SW3SW3SW4S3S4S4CalmS4S5S6SW3SW6SW10S6SW6

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
IR Satellite Image from GEOS

GOES Local Image of Midwest    EDIT

Wind Forecast for Kansas City/Pleasant Hill, MO (17,4,5,8)
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Ground Weather Radar Station Kansas City/Pleasant Hill, MO
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weather_mapweather_map weather_map

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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.