Tuesday, March28, 2017 L-36.com


Marine Weather and Tides
Grenada, MS

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:50AMSunset 7:20PM Tuesday March 28, 2017 8:55 AM CDT (13:55 UTC) Moonrise 7:24AMMoonset 8:08PM 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 281157 aaa
afdjan
area forecast discussion... Updated
national weather service jackson ms
657 am cdt Tue mar 28 2017

Warm and dry early week before severe weather is expected
Wednesday night and Thursday...

Update
Updated for 12z aviation discussion

Aviation
12z TAF discussion:
widespread MVFR conditions are at most TAF sites, except glh.

There is some possibility some lower stratus could move in the
next couple of hours there. Some ifr lower ceilings and patchy fog
may also advect into pib and hbg as well by 13z. Any patchy fog
should lift by around 15-16z or so. Widespread MVFR to ifr stratus
will linger through around 17-19z beforeVFR conditions are
expected afterwards areawide at all TAF sites. Winds will mainly
be out of the south-southwest around 4-7kts, while near glh may
shift from west-northwest due to the front near the area before
becoming more south-southeast in the afternoon. Some isolated
showers and vcts are possible near gtr, cbm, hks, jan, nmm and jan
around 19z before conditions clear after 29/00z. Some lower MVFR
visibilities and ceilings due to stratus/patchy are again expected
areawide between 29/05-08z or so, while some ifr conditions due to
lower stratus are possible at hbg around the same time. /dc/

Discussion
Today through tonight:
surface analysis this morning shows the cold front draped across the
highway 82 corridor down to the northeast louisiana/southeast
arkansas to south of shreveport, louisiana area. Water vapor imagery
shows the closed low spinning over northern kentucky into the ohio
valley while all colder cloud tops are situated off to our east.

Most of the convection in our area has weakened with any stronger
more organized storms off to our east in central alabama. Overall
much quieter afternoon is in store today. This front will slowly
drift to the south, maybe only slightly towards the highway 20
corridor, as upper trough/surface moves into the appalachians and
forcing and shear axis pulls away. This will promote some shower and
thunderstorm activity mainly confined to the front just north of i-
20 early in the mid-morning. More will develop and spread south
through the afternoon. Pws will be near an inch to an inch and a
half, which will support more isolated to scattered convection. With
shear axis pulling away and shortwave ridging building in, this will
promote less potential for any organized convection. With decent
dewpoints and some lapse rates and weak instability, would not rule
out an isolated strong storm or two. However, most convection should
remain tame this afternoon. With boundary layer temperatures not
changing too much, except slightly cooler along and in the wake of
the front in the delta, expect similar warm high temperatures to
yesterday, in the low-mid 80s, which some 10+ degrees above normal.

As the strong closed low/jet dives into the southern rockies and
southern plains into texas late this afternoon to evening, the
shortwave ridging will be building east through the arklamiss. This
will help the cold front to slowly lift back to the north-northeast
as a warm front. Some increased moisture advection/isentropic lift
will help any chances of showers or very isolated convection/storms
to remain tied to that this evening. This will lift into the highway
82 corridor late evening before lifting north of the area after
early Wednesday morning, around 3-4am. Clouds should remain in the
area, with more low stratus moving back into the pine belt and i-20
corridor by daybreak. There is some weak isentropic subsidence which
could scatter out some cloud cover in the southwest before more
widespread clouds move back in by daybreak. With clouds still
lingering in the area, dewpoints holding up and and an increasing
pressure gradient/gusty winds from the developing low/cold front out
west, expect low temperatures to remain warm, a few degrees above
mos, in the low-mid 60s. /dc/
Wednesday through Monday:
a potential severe weather event for the Wednesday night/Thursday
period will continue to be the main concern for the long term
portion of the forecast. Prior to the event, a strong and
progressive upper level ridge will move across the arklamiss
bringing continued well above normal temperatures Wednesday, and a
few record highs are not out of the question.

A strong trough crossing the southern plains will approach the
arklamiss late Wednesday night with significant height falls ( 12 hr
~ 5 to 10 dam) and widespread convective rainfall expected to reach
the delta region before daybreak. Given steep mid level lapse rates
and strong deep layer shear, expect some storms to be severe with
all modes of severe weather possible. Global models show pretty good
agreement on this set-up and the severe threat is fairly clear for
the Wednesday night period.

However, the scenario will become more convoluted and messy Thursday
when a subtropical jet rounding the base of the trough leads to a
split upper jet pattern that will influence the mesoscale convective
evolution and subsequent severe threat outline. This pattern
supports a coastal latitude mesoscale convective system that would
move well south of the i-20 corridor should it develop. Such a
system would disrupt low level flow and induce a meso-high over the
heart of the forecast area Thursday with any substantial severe
weather threat questionable to develop due to these stabilizing
effects. Over northern portions of the area, continued lift ahead of
the polar trough and adequate displacement away from a coastal mcs
would support additional severe storms over northwest/north central
portions of the forecast area. With all of that said, should the
potential MCS activity propagate more quickly eastward and allow low
level flow to redevelop early enough in the day, then
destabilization and the severe weather threat could increase for
most of central and east ms.

The threat for storms/severe weather will end early Thursday night,
and another upper level ridge will progress across the region from
Friday through most of the weekend bringing more above normal
temperatures and generally dry weather. We should see the next
strong trough approach Sunday night bringing another chance for
severe weather as we go through early next week. Have held off on
mentioning this threat in the hwo/graphics with it being near the
end of the forecast period and given the threat is not squarely on
the arklamiss, but it is likely we will be dealing with this system
in some capacity, including for both severe weather and heavy
rainfall, as we get closer in time. /ec/

Preliminary point temps/pops
Jackson 83 63 86 65 / 25 6 6 27
meridian 83 62 85 63 / 26 6 5 10
vicksburg 82 64 85 66 / 24 8 9 57
hattiesburg 84 63 84 64 / 22 4 5 11
natchez 84 65 84 67 / 23 7 10 54
greenville 79 63 82 65 / 17 15 8 75
greenwood 80 64 84 65 / 21 16 5 56

Jan watches/warnings/advisories
Ms... None.

La... None.

Ar... None.

Dc/ec


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi63 minSW 59.00 miOvercast69°F66°F90%1014.3 hPa

Wind History from GWO (wind in knots)
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Last 24hrS10S15S15S19
G26
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SW12SW8SW5S5SW5SW8SW9SW7SW6SW5S6SW6S6SW7SW5
1 day agoSW7SW11SW9SW14SW9SW8S8SW6SW7SW5CalmNE3CalmNE3S3S7S11S9S7S8S8S4S8S8
2 days agoS11
G21
S10S13S11SE6SE11S7S8S8SE9SE6SE9S4CalmSE5S3S5S4S6S7S7S4CalmSW7

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 Jackson, MS (9,2,3,4)
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Ground Weather Radar Station Columbus AFB, MS
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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.