Sunday, August19, 2018

Marine Weather and Tides
Grenada, MS

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Sunrise 6:25AMSunset 7:43PM Sunday August 19, 2018 8:22 PM CDT (01:22 UTC) Moonrise 2:51PMMoonset 12:44AM Illumination 61% Phase: Waxing Gibbous; 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 192349 aaa
area forecast discussion... Updated
national weather service jackson ms
649 pm cdt Sun aug 19 2018

Updated for 00z aviation discussion

00z TAF discussion:
dissipating tsra activity was resulting in ifr conds in the NW and
se at 2330z. These conds wl improve before lower flight conditions
develop again by 08z. Most of the current tsra activity wl
dissipate by 02z but additional tsra development wl be psbl after
06z in the north again. Away from tsraVFR conds wl cont until
after 08z when widespread MVFR ifr CIGS are expected. Conds wl
improve by mid Monday morning but scattered to numerous tsra
activity is expected to develop early again. 22

Tonight: an active period of weather will continue through
tomorrow as a closed mid upper-level low is progged to propagate
from the central plains into the midwest by tomorrow evening. This
will send an associated surface cold front towards the area with
continued showers and thunderstorms along and ahead of the front.

Through the rest of today, the greatest thunderstorm coverage
continues to remain along the hwy 84 and i-59 corridors where the
greatest destabilization has occurred outside of this morning's
widespread cloud coverage. Latest visible satellite imagery
indicates a cumulus field trying to develop in a ring around the
dense high clouds left over from the convective complex over the
northwest delta. A few showers have already managed to develop
along the western ashely county line in southeast arkansas with
additional development further south expected. The main
uncertainty continues to be convective evolution through the rest
of this afternoon into this evening as hi-res cam guidance
continues to struggle on both spatial and temporal scales. The
current forecast thinking is for an eventual composite outflow
boundary from the southern convection to gradually push north
towards the i-20 corridor and initiate additional convection.

Additional outflow boundaries and interactions would help foster
continued showers and storms further into the heart of the cwa,
however this will be conditional as to how much destabilization
ends up being realized where cloud cover is slower to dissipate.

While a few strong to isolated severe storms with locally damaging
winds remain possible, coverage will remain too low to mention in
the hwo graphics. The ongoing area wide limited risk for flash
flooding will also be kept as is due to recent heavy rains. By
tonight, convection will begin to dissipate with loss of daytime
heating, however there's decent agreement that a dissipating line
of showers and storms could enter the delta late tonight into
early tomorrow morning.

Monday: the main focus will be the encroaching cold front and
associated convection both along and ahead of the front. Showers
and thunderstorms are expected to get an early start my mid to
late morning, especially along and southeast of the natchez trace
corridor as daytime heating commences in a moist environment. No
severe weather is expected from this early activity, however
locally heavy rainfall and isolated flash flooding will remain
possible. While timing differences remain, the main focus will be
for a broken line of convection to enter the delta along the cold
front during the mid to late afternoon hours and propagate east
through the early evening. While mid-level lapse rates remain weak
(5.5-6 c km), increasing tropospheric wind fields will yield
upwards of 35-40kts of 0-3km shear which will be juxtaposed with
2500-3500 j kg of sbcape. Mid upper-level dry air will also be
moving in resulting in upwards of 1200 j kg of dcape in area
average forecast soundings. As such, have included a limited risk
for severe weather in the hwo graphics with the main threat being
damaging wind gusts and hail up to quarter size. Given the
aforementioned parameters, an eventual upgrade to a slight risk
cannot be entirely ruled out if confidence in coverage and
convective evolution increases. Tw
Monday night through Saturday: anomalous mid level cold core over
the mid ms valley will drag a cold front into the area at the
beginning of the period. As it plows into a moist and unstable
airmass primed from daytime heating with pws near 2 inches, a good
concentration of showers and thunderstorms will likely be ongoing
over the arklamiss delta region. Some risk of severe looks to
continue into the evening hours given the frontal forcing and 20-30
knots of deep layer shear, but these storms should wind down
somewhat by midnight with the loss of daytime heating.

The frontal boundary will slow down considerably after midnight and
limp into central sections by dawn Tuesday. Daytime heating and
frontal convergence will support more convection by Tuesday
afternoon over the south, but severe threat appears minimal as deep
layer shear relaxes.

While the drier air spreading into the area behind the front will
lead to less overall convection and cooler overnight lows, the
august Sun will become quite efficient at warming the airmass each
afternoon; still being able to boost MAX temperatures into the lower
90s. This will be the case through Friday as high pressure over the
mid ms valley maintains low level northerly flow.

As high pressure shifts to the east Saturday, resulting low level
easterly southeasterly flow will finally begin bringing low level
moisture back into the area. This will promote a return of diurnal
convection heading into the middle of the weekend. 26

Preliminary point temps pops
Jackson 74 89 73 90 24 44 43 26
meridian 73 88 74 90 64 53 28 42
vicksburg 75 91 72 91 31 42 42 20
hattiesburg 74 87 74 91 17 59 26 56
natchez 75 90 73 91 61 41 37 29
greenville 74 89 71 88 53 40 57 11
greenwood 74 88 71 88 43 46 56 14

Jan watches warnings advisories
Ms... None.

La... None.

Ar... None.

Tw 22 26

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greenwood, Greenwood-LeFlore Airport, MS24 mi29 minESE 310.00 miMostly Cloudy82°F77°F85%1012.6 hPa

Wind History from GWO (wind in knots)
Last 24hrS4S8S7S8SW4S5CalmS4SW3SW5SW6S9SW10SW8S7SW5SW6CalmS5SW7SW4S4S7SE3
1 day agoS4CalmS3CalmCalmCalmCalmCalmCalmSE5S3S4S5SW7S7S3S6S5SW3SW5SW34CalmSE3
2 days agoS6S10S10S7S5S3S5S4S6S6S6CalmCalmNE6CalmSE4CalmCalm3W8

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Jackson, MS (21,6,7,8)
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Ground Weather Radar Station Columbus AFB, MS
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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 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 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.