Wednesday, August23, 2017 L-36.com


Marine Weather and Tides
Grenada, MS

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 6:28AMSunset 7:37PM Wednesday August 23, 2017 3:20 AM CDT (08:20 UTC) Moonrise 8:18AMMoonset 9:03PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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 Grenada, MS
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location: 33.78, -89.81     debug


Area Discussion for - Jackson, MS
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Fxus64 kjan 230501 aaa
afdjan
area forecast discussion... Updated
national weather service jackson ms
1201 am cdt Wed aug 23 2017

Update
Updated for 06z aviation discussion

Aviation
06z TAF discussion:
isolated to scattered showers and thunderstorms will continue
overnight between glh and gwo as a cold front tries to move into
the area. The convection will begin breaking out further south
after sunrise as the front continues moving south. Ceilings and
visibilities will be lowered at TAF sites that receive a storm,
otherwiseVFR conditions will prevail through the period. 26

Discussion
The outflow from the storms which sparked along the front in the
mid-ms valley today are now pushing southward through northern ms.

With the loss of daytime heating and further weakening of
instability, this line of storms is not expected to make it too
much further without breaking up. None of the hi-res models even
show it making it into our CWA tonight. However, this outflow does
seem to have the momentum to reach at least our northern
counties within the next couple hours. Therefore, the pops have
been tweaked for this update. 10
prior discussion below:
through Wednesday:
isolated convection continues this afternoon as a
weak shortwave passes through the ohio valley and a weak upper low
sits over the western gulf. The local microburst checklist indicated
low potential for robust storms today, and so far this has been the
case. Much of this activity will die off with the loss of diurnal
heating. However, some limited potential for precip will persist
over northern portions of the forecast area overnight ahead of an
approaching cold front. This front currently extends from the
central plains through the mid-ms valley and is sliding southward
toward the region. It should reach north ms during the day tomorrow,
bringing a sharper focusing mechanism for scattered to numerous
showers and thunderstorms, particularly during the afternoon when
instability will be greatest. Given fairly typical (or somewhat
weaker due to clouds) instability and unimpressive deep layer shear,
no notable severe weather threat is anticipated. A few instances of
locally heavy rainfall can't be ruled out given sufficient deep
layer moisture and potentially slow storm motions, but this threat
remains too low for mention in the hwo. Dl
Wednesday night through Tuesday...

the period will start off with subtropical ridging across the
eastern gulf of mexico, troughing across the great lakes and a
building ridge over the desert southwest. A surface cold front
will also be dropping south through the arklamiss in association
with a departing low over southeast canada. Areas of convection
are expected to be ongoing during the early evening hours on
Wednesday as the front drops through the area. Expect a few
isolated to possibly scattered showers and storms to continue
overnight along and ahead of the front. By Thursday morning,
latest global models are in agreement on the front draped along or
just to the south of i- 20 which will help to focus shower and
storm chances mainly south of i-20 during the day on Thursday. A
few strong storms with isolated gusty winds cannot be ruled out
both early Wednesday evening and during the day Thursday but
severe weather is not expected with lapse rates, vertical totals
and shear remaking less than ideal for robust convection.

Moisture pooling ahead of the front will help to result in 2 inch
pwats and when combined with weak flow could result in locally
higher rainfall totals, however any flash flooding looks to remain
isolated so will not mention in the hwo. Much drier air will
filter in behind the front Thursday into Friday with dewpoints
dropping into the upper 50s along the hwy 82 corridor and low 60s
further south. This drier air should keep any afternoon showers or
storms limited to the extreme southern portion of the area or
outside of our CWA completely depending on where the front stalls
out at.

Forecast uncertainty starts to increase by the weekend and
especially into early next week as the models continue to try and
resolve the evolution of the remnants of tropical storm harvey.

These remnants are currently located over the yucatan peninsula and
are progged to move into the bay of campeche and then gulf of mexico
Thursday and Friday. There's good consensus in that strengthening
will occur with a tropical system developing off the coast of
southeast texas. This system will be moving around the western edge
of the subtropical ridging in the eastern gulf of mexico while the
desert southwest ridge expands into portions of west texas and
strengthens over the great basin. This synoptic evolution would
slow down the system movement until a weakness in the ridging
develops as a shortwave trough drops into the southern plains and
picks up phases with the tropical system after making potential
landfall in texas. Global models offer a plethora of widely
varying solutions, as would be expected since models often
struggle with systems that haven't developed yet, however there is
some increasing concern for flash flooding across at least some
portion of the arklamiss during the late weekend and early next
week time frame as deep tropical moisture gets lifted through the
area along the retreating frontal boundary baroclinic zone.

Explicit model QPF products paint swaths of 10-15 inches of rain
anywhere from coastal texas through the arklamiss and into
tennessee but have lacked run- to-run consistency. Exact placement
of the axis of heaviest rainfall totals will be highly dependent
on the timing and evolution of the key synoptic features and given
the inconsistencies displayed in the last few runs of model
guidance the reader is encouraged to stay abreast of the latest
forecast and not to focus on any one model solution. With the
timing favoring the day 6-9 time frame will also hold off on
mentioning in the hwo graphics for now, but will closely monitor
the trends for inclusion in later forecasts. Tw

Preliminary point temps pops
Jackson 74 91 71 87 10 52 28 30
meridian 74 91 71 87 11 57 30 27
vicksburg 74 91 71 87 9 46 29 31
hattiesburg 73 92 73 89 8 51 32 50
natchez 73 90 72 86 7 44 32 48
greenville 74 88 68 86 21 53 14 9
greenwood 74 89 68 86 20 56 16 11

Jan watches warnings advisories
Ms... None.

La... None.

Ar... None.



Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi27 minN 010.00 miFair72°F71°F97%1014.7 hPa

Wind History from GWO (wind in knots)
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Last 24hrCalmCalmS3CalmS4SW4SW533W4CalmS8SE8S8S7SW4CalmCalmCalmCalmN7CalmCalmCalm
1 day agoCalmCalmCalmCalmCalmSW3CalmN5NE3CalmCalm4E15
G22
W4SE3SE3CalmCalmCalmCalmCalmCalmS4S3
2 days agoCalmCalmCalmCalmCalmS4Calm3SW3S3S5S6SE5CalmCalmCalmCalmCalmCalmCalmCalmNE3NE4Calm

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
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Jackson, MS (4,6,7,8)
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Ground Weather Radar Station Columbus AFB, MS
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weather_mapweather_map weather_map

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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.