Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Grenada, MS

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:28AMSunset 7:36PM Sunday August 25, 2019 10:34 AM CDT (15:34 UTC) Moonrise 1:12AMMoonset 3:45PM Illumination 24% Phase: Waning Crescent; Moon at 25 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 251110
afdjan
area forecast discussion
national weather service jackson ms
610 am cdt Sun aug 25 2019

Update
Updated for 12z aviation discussion

Aviation
12z TAF discussion:
most TAF sites are seeingVFR conditions this morning despite some
showers around the area.VFR conditions should mostly prevail
through the morning but additional showers and storms will occur
again today and into this evening. The best chances for today will
reside in the north, which could affect kglh kgwo. Later this
afternoon and through Monday, better chances for rain will affect
taf sites at kgtr kmei kpib khbg and possibly kjan. Where storms
occur, reduced visiblities and ceilings will be possible and MVFR
or lower conditions could occur. These lowered ceilings will
linger into tonight and early tomorrow, particularly in the east.

28

Discussion
Today and tonight...

our relatively wet pattern will continue today, and in fact, better
coverage of showers and storms should occur. Pw values across the
area remain in excess of 2 inches, with around 2.25 inches being
sampled on the 00z klix sounding. This tropical airmass will remain
across the area, which has contributed to continued showers and
isolated thunderstorms overnight across portions of the arklamiss
along with a stalled frontal boundary. Models continue to show that
even more moisture will ooze its way into the region through the day
with pw values forecast to be around 2-2.5 inches across portions of
the area, especially the east and southeast part of the forecast
area. For some locations, this is in the 97th to 99th percentile.

The impetus for this influx of moisture is an area of low pressure
that is sitting across the northern gulf of mexico, just offshore of
louisiana. Through the course of today, this low will slowly
progress to the north and east, eventually moving onshore across
southern louisiana. As this occurs, additional showers and some
storms will move into the southern sections of the forecast area.

This low will trek to the north and east across southeast
mississippi through the evening and overnight hours, increasing
potential for showers and storms in this location through pre-dawn
Monday morning. Because of this, the best rainfall QPF will be
generally along and east of the natchez trace parkway, with the bulk
of it occurring most likely between midnight and 7am Monday.

Rainfall totals through Monday morning will be around 1.5 to 2.5
inches from roughly bude to columbus and locations south and east of
this line. With high atmospheric moisture, efficient rainfall should
occur and some locations may see heavier rainfall, especially if
rain storms train over the same locations. This may lead to
localized flooding and will go ahead and advertise this limited risk
in the hwo graphics for this area. This will coincide with at least
a portion of the day 1 marginal and slight risks for excessive
rainfall from wpc. If rainfall totals increase or model guidance
suggests a slower moving low pressure system, future shifts may want
to consider a flash flood watch for south southeast east mississippi
for later tonight into early Monday but we will hold off for now.

Rain and storms expected today further north across the highway 82
corridor will be less associated with this low pressure system and
more with a shortwave dropping south and this stalled boundary over
the region. Rainfall amounts in this corridor will range from half
of an inch in the delta to two inches in the golden triangle(some of
which may also be influence from the incoming low later in the
night).

Clouds and rain today should hinder temperatures. Highs are
expected to reach into the 80s today across the area. 28
Monday through early next weekend:
the perturbed & stormy pattern will remain in place around early
week before a drier, slightly cooler & near seasonable pattern will
move in mid-late week. At the start on Monday, a weak surface low
pressure & shortwave trough will be becoming phased into longwave
synoptic trough & cold front digging southeast out of the plains.

This will only help bring a stronger low-level jet & influx of
tropical moisture (i.E. 2-2.5 inch pws) across most of the area.

With a stationary front lingering across to the north, expect
increasing isentropic ascent & moisture transport & convergence to
combine with synoptic jet dynamics to favor widespread rain &
storms. Global & high resolution guidance continue to depict
tropical moisture laden air supportive of high rainfall totals. Some
gradual totals of 2-3 inches are indicated, possibly locally higher.

Will continue the threat for locally heavy rainfall & localized
flash flooding in the hwo & graphics into Monday afternoon. This
threat will likely be diurnally drive further north & more mesoscale
& surface feature driven further south closer to any surface low.

The euro is a little more on the aggressive side on the surface
feature, while the other suite of consensus is a little less clear
on the details. Even saying that, the newer euro has backed off on
qpf in the northeast, so resolving some of these mesoscale details
will be difficult. In the wake, we will be either in a zonal to
northwesterly synoptic flow, with a broad trough swinging off to our
north. This will lead to increased forcing & juxtaposition of
favorable parameter space (i.E. Steeper lapse rates vertical totals
into the mid-upper 20s & little better low-mid level bulk shear up
to ~20-25kts or so @ 0-3km & 0-6km) for some strong storms &
isolated severe storm potential by early-mid week (i.E. Tues.-wed.).

Being on the eastern periphery of the ridge to the west will keep
any central plains MCS of concern, but we may be just enough to the
east to remain out of the higher threat. For now, will keep mention
of severe out of the hwo, but may be needed as we get closer. Global
consensus has been consistent on the cold front around mid-late
week, with the GFS slightly slower. Regardless, surface high
pressure will build in the wake, with much drier air & pattern in
the wake & cooler than normal lows & near to slightly below normal
warmth. Global consensus continue to depict a broad & weak easterly
wave surface trough drifting west across the eastern gulf of mexico
into early next weekend, with another front diving down, based on
the 00z euro.

Numerous rain & storms can be expected on Monday, with the highest
chances across the i-59 & highway 45 corridor through midday Monday.

Expect these chances to build to the east-northeast into Tuesday.

Heat stress will remain hampered by this pattern, with some
potential west of the mississippi river on Tuesday. For now, there
remain too much uncertainty on mesoscale storm details to outline
any heat potential. Highs will generally be below at the start of
the work week, due to widespread clouds & storms, before being near
or slightly below normal early-mid week or so. Below normal lows,
even into the low-mid 60s, are possible late week & into the
weekend. This cooler & drier pattern will be a nice reprieve from
the humid & stormy pattern early in the week. Dc

Preliminary point temps pops
Jackson 87 72 87 73 80 69 63 16
meridian 89 72 84 72 82 82 75 28
vicksburg 88 73 89 75 64 49 42 11
hattiesburg 88 72 85 73 82 82 75 19
natchez 85 73 87 74 77 61 48 11
greenville 88 72 89 74 74 50 26 10
greenwood 87 72 86 74 81 59 44 14

Jan watches warnings advisories
Ms... None.

La... None.

Ar... None.

28


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi1.7 hrsSE 410.00 miLight Rain77°F73°F90%1014 hPa

Link to 5 minute data for KGWO

Wind History from GWO (wind in knots)
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Last 24hrN4CalmCalm4Calm4Calm--N6NE3N3Calm----CalmSE4--3----NE3NE3--SE4
1 day ago--CalmS4SW4--S6SW3S5--CalmN3NE3--------CalmCalmSW3CalmCalmCalmS3S4
2 days ago----CalmSW33CalmCalmS4----S4--------------S5--CalmCalm--S6

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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GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Jackson, MS (11,2,3,4)
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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.