Tuesday, May23, 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 5:53AMSunset 8:01PM Tuesday May 23, 2017 3:50 AM CDT (08:50 UTC) Moonrise 4:27AMMoonset 5:39PM Illumination 6% Phase: Waning Crescent; Moon at 27 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 230608 aac
afdjan
area forecast discussion... Updated
national weather service jackson ms
108 am cdt Tue may 23 2017

Update
Updated for 06z aviation discussion.

Aviation
06z TAF discussion:
ongoing rain at several TAF sites early this morning will continue
for the next several hours before clearing from west to east. MVFR
conditions are expected to remain after the rain stops through
around 15z to 16z due to a combination of low stratus and patchy
br. Have gone on the optimistic side for the afternoon forecast,
with ceilings mixing out into theVFR range, though a few areas
could hang onto some broken stratus around 2500 feet. There may be
another chance for showers or a few thunderstorms to affect sites
after 00z Wednesday, but chances are too low to include in tafs at
this time. /nf/

Discussion
As of 230z, a surface low was located near the ms/la line just ne
of baton rouge with an inverted trough axis extending into central
ms and a baroclinic zone just inland separating a moist unstable
marine layer from cooler more stable air to the north. Meanwhile
aloft, broad troughing is located across the central us with a
coupled jet structure supporting upper level divergence across the
arklamiss. Strong isentropic ascent above the baroclinic zone in
concert with the aforementioned coupled jet helped to support an
expansive area of moderate to heavy stratiform rain across a large
portion of the CWA this afternoon and is still ongoing, but lower
rainfall rates with this area of precip have precluded a greater
flash flooding threat so far. Latest rap analysis also indicated
the presence of an internal diabatically enhanced potential
vorticity anomaly which has helped to strengthen the low level
flow and moisture advection into the area. For the remainder of
the evening, the heaviest rainfall is starting to edge into the
south central portions of the forecast area and will slowly spread
further north and east overnight. This is where the flash
flooding potential will be maximized mainly south of the i-20
corridor where 2 - 4 inches of additional rainfall with some
locally higher amounts will be possible. As such, the current
flash flood watch and limited/elevated areas in the hwo look well
placed and will let ride as is for now. The majority of the
lightning activity has been well offshore over the gulf and with
little instability not expecting any severe weather so the
marginal risk was removed in accordance with the latest spc
outlook. However, an isolated lightning strike or two cannot be
entirely ruled out as a few pockets of moist absolutely unstable
layers move through the area. Last, but not least, a few areas of
patchy fog are possible tonight mainly along the hwy 84 corridor
and portions of the delta as the rain moves off to the east. /tw/
prior discussion below:
rain has been slow to advance east today, but saturated lower
levels now are ensuring much more reaching the ground. Surface low
over southeast tx remains responsible for the widespread
isentropic ascent and should continue tonight as the low moves
along the baroclinic zone along the coast. Have some concern that
the low may shift a bit to the north as better baroclinicity
actually exits from west central la into southwest ms. If this
occurs, heavier rainfall could develop further north than expected
right now. As of now, expect around 2 inches in the far south
with locally higher amounts.

Most of the heavy rainfall will depart into al by 12z Tuesday, but
digging mid level trough and at least a few breaks in the cloud
cover should be sufficient for scattered thunderstorms in the
afternoon. The best lapse rates will occur in the east during the
afternoon and with around 40 knots of deep layer shear, would not be
surprised to see some isolated severe storms here./26/
Tuesday night through Sunday... Our winds aloft will remain out of
the southwest as a closed low drops south from the upper to mid-
mississippi river valley by Wednesday morning. A shortwave rounding
the base of the closed low will swing east across our CWA and help
support a weak cold front and another good chance of showers and
storms Tuesday night into Wednesday. Cooler and drier air will
filter into the CWA in the wake of the cold front but the closed low
will continue to drop southeast across northeast mississippi and
maintain light rain chances over the northeast half of our cwa
during the day Wednesday. By Wednesday evening, dry weather is
expected and the skies will clear from the southwest. With mostly
clear skies and a drier airmass over the area, the coolest morning
lows of the forecast period are expected Thursday. Most sites will
bottom out in the lower 50s. Thursday and Friday will be dry with a
warming trend. Low amplitude ridging aloft will move over our cwa
while a surface high strengthens over the northwest gulf and
ridges back to the west across the gulf coast states. The
resulting southerly flow will slowly increase moisture back across
our area. Saturday mid level ridging will strengthen over the
gulf and may limit convection across our southern zones but
elsewhere deep enough moisture will be back across our CWA to
combine with daytime heating to result in isolated to scattered
afternoon and early evening storms. Models differ on timing but
another closed low near the upper plains and canadian border will
deepen a trough over the central CONUS Sunday into Monday. This
will lead to increasing rain chances Sunday into Monday. /22/

Preliminary point temps/pops
Jackson 79 58 73 53 / 48 60 17 3
meridian 80 60 74 51 / 81 58 32 6
vicksburg 80 58 75 53 / 37 62 13 3
hattiesburg 82 63 77 54 / 84 57 22 3
natchez 79 58 74 54 / 34 62 10 3
greenville 78 57 73 54 / 34 61 18 5
greenwood 78 57 71 52 / 42 61 25 6

Jan watches/warnings/advisories
Ms... Flash flood watch until 7 am cdt this morning for msz052-054>066-
072>074.

La... Flash flood watch until 7 am cdt this morning for laz024-026.

Ar... None.

Tw/nf/22


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi57 minN 09.00 miOvercast66°F64°F96%1010.4 hPa

Wind History from GWO (wind in knots)
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Last 24hrNE3CalmNE4N4CalmNE5NE9NE8E4NE6CalmCalmCalmCalmW3E4CalmNE6CalmCalmCalmCalmCalmCalm
1 day agoE3CalmCalmS4Calm4W4N4N3CalmW6NW9
G16
W8NW3NE33CalmCalmW3NW3CalmCalmCalmN6
2 days agoS4S3S5S6S4S7S8SW9SW11SW7NW11
G20
5N4SE10SE7S6SE4SE3SE4SW4S3SW4CalmS3

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 (4,6,7,8)
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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.