Tuesday, May22, 2018 L-36.com


Marine Weather and Tides
Grenada, MS

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:53AMSunset 8:00PM Tuesday May 22, 2018 2:27 PM CDT (19:27 UTC) Moonrise 1:18PMMoonset 1:55AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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 221810 aaa
afdjan
area forecast discussion... Updated
national weather service jackson ms
110 pm cdt Tue may 22 2018

Update
Updated for 18z aviation discussion

Aviation
18z TAF discussion:
as expected,VFR categories are being observed at sites across
the region early this afternoon. With scattered convection once
again expected to slowly move across the arklamiss from early
afternoon through early this evening, a brief bout of MVFR ifr
ceilings and or visibilities will again be possible if observed
on-station. This activity will dissipate during the evening hours.

Winds will be light northerly. As we push into 10z expect some
areas of ifr MVFR ceilings which will lift by 15z. 17

Discussion
Current forecast appears to be on track for convection to develop
mainly during the afternoon and decrease during the evening hours.

Latest 12z sounding produced a chance category for microburst
potential. It had the following parameters sb CAPE of 3970, li
-10, low level lapse rate 9c, and pwats 1.7 inches. So isolated
strong to possibly severe storms will be possible with gusty winds
being the primary concern. Also with the pwats around 1.7 inches
and weak flow aloft locally heavy downpours in slow moving storms
will also be possible. Otherwise the current forecast for highs in
the upper 80s to around 90 still looks reasonable. 17
prior discussion below:
today and tonight:
look for much of the same, as in recent days, across the forecast
area today. With plenty of moisture encompassing the region,
precipitable h2o values still meandering around 1.75 inches,
coupled with weak troughing nearby aloft, and highs again warming
to around 90, scattered showers and storms will again begin
developing across the forecast area around noon today. Convection
is expected to be at its peak between 3-6 pm, and is expected to
begin to dissipate after sunset this evening as daytime heating
wanes.

Once again a few strong storms, and perhaps an isolated storm or two
reaching severe limits, cannot be ruled out during this time. Gusty
winds will be the primary concern with these storms, but some storms
containing mainly small hail can't be ruled out. Frequent lightning
strikes are expected with all storms. Also, due to continued weak
flow across the region, convection will be slow-moving and could
produce some high rainfall rates in a short amount of time. This
could result in the ponding of water on roads and in low-lying, poor
drainage areas. If multiple slow-moving storms repeatedly traverse
the same locales, some localized flash flooding will also be
possible. Due to the overall scattered nature of convection and low-
end confidence in severe storms, i'll maintain a clear hwo on this
morning's package.

Again, convection will likely linger a few hours into the tonight
period. It will gradually dissipate during this time due to the
loss of heating. With partly cloudy skies expected tonight,
conditions will continue to be humid as lows only fall into the
upper 60s to lower 70s. 19
Wednesday through Monday:
signs are pointing to a very wet forecast for memorial day weekend
as moisture increases in association with an an upper level
trough axis over the lower ms valley region. Potential tropical
low formation in the gulf of mexico later this week is getting the
most attention in the forecast, but weather impacts will
most likely be the same in the arklamiss regardless of tc
development with heavy rainfall the primary concern.

For wed-fri, expect the current early summer-like weather regime
to continue - very warm, humid and unstable conditions leading to
more aftn evng storms, some of which will be strong to marginally
severe. Going into the weekend, confidence is fairly high that
greater influence and lift from a deepening upper trough low will
support increased shower TSTM chances with less diurnal
influence. Given the persistent nature of this feature and
precipitable water values increasing to above two inches, we
could eventually see heavy rainfall flooding concerns develop.

Heavy rain flooding concerns would become more enhanced on a
smaller scale somewhere in the region if a warmer core system were
to develop, but trying to forecast such a scenario at this time
frame is extraordinarily difficult. What we can say is that the
synoptic pattern with upper ridge axes near the south atlantic
coastline and southern plains would support persistent lift and
moisture transport over the lower ms valley and at least a
general threat for heavy rainfall. Will hold off for now on the
mention of flooding in the hwo, but it will be something to
consider if trends continue. Ec

Preliminary point temps pops
Jackson 68 90 70 88 38 24 37 26
meridian 68 89 69 89 33 24 33 30
vicksburg 69 89 70 89 23 22 41 21
hattiesburg 69 89 68 87 53 36 51 32
natchez 69 88 70 88 26 29 53 20
greenville 71 88 71 89 28 16 28 17
greenwood 70 89 70 90 25 17 25 12

Jan watches warnings advisories
Ms... None.

La... None.

Ar... None.

17


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi34 minN 510.00 miFair87°F66°F51%1015.8 hPa

Wind History from GWO (wind in knots)
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Last 24hrN9
G19
E4E8S4CalmCalmCalmE8SE5S3CalmN3CalmCalmCalmCalmCalmSE3S5Calm3CalmN4N5
1 day agoSE9E4--SW5
G20
CalmE5N3N4S20
G24
SW4NE8E3SE3E3CalmNE4CalmSE4SE5E4SE53Calm--
2 days ago--5S9S5S5E3CalmCalmCalmNE444CalmS3S3CalmS3S3SW663CalmCalm4

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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wmap_A
GOES Local Image of Midwest    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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Jackson, MS (15,3,4,5)
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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.