Thursday, December13, 2018

Marine Weather and Tides
Guntersville, AL

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:41AMSunset 4:37PM Thursday December 13, 2018 3:59 PM CST (21:59 UTC) Moonrise 12:15PMMoonset 11:23PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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 Guntersville, AL
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location: 34.37, -86.25     debug

Area Discussion for - Huntsville, AL
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Fxus64 khun 132113
area forecast discussion
national weather service huntsville al
313 pm cst Thu dec 13 2018

Near term (tonight)
issued at 313 pm cst Thu dec 13 2018
southeasterly winds and fairly strong warm air advection through the
day aided by peaks of sunshine, have pushed temperatures into the
lower 60s in portions of northwestern alabama. Likely will be as warm
as it will get this afternoon, with thicker cloud cover building
back into the area from the south over the next few hours. Low mid
level moisture will quickly build north as well into the evening
hours, but dry air (dewpoints around 30 to 40 degrees) east of i-65
will need to be modified significantly before rainfall aloft can make
it to the ground. More moist air west of i-65 should be able to
modify more quickly as the southerly southeasterly low level jet
(around 925 mb) increases to between 30 and 40 knots tonight. This
should allow isolated to scattered rain to push into northwestern
alabama early this evening and become widespread in coverage after 10
pm or so. Further east, expect scattered rainfall to develop around
midnight and become widespread overnight. This increasing moisture lift
is all courtesy of stronger isentropic lift generated north of a
warm front extending from central arkansas southeast into extreme
eastern portions of lousiana. Lows should be tempered by cloud cover
across the area, but temperatures should fall a bit late through the
early evening hours into the mid 40s to around 50 degrees overnight
east of i-65 (where thicker cloud cover may take a bit longer to
develop). Rainfall this evening should be generally light, but up to
a quarter looks possible west of i-65. The best lift looks like it
will shift quickly into northeastern alabama around and after

Short term (Friday through Saturday)
issued at 313 pm cst Thu dec 13 2018
this will likely produce heavier rainfall east of i-65 as the warm
front moves into those locations before pushing into georgia eastern
tennessee just after daybreak on Friday. A strong tongue of warm air
advection in the boundary layer is shown along and behind that warm
front Friday morning. This could allow temperatures to climb into the
mid 60s, but at this time only including highs in the lower 60s in
the forecast. This may need to be raised in future updates. Instability
is not shown in guidance until Friday afternoon, as the warm air
advection continues to bring more moist and possibly slightly
unstable air into the area. However, there is a large degree of
uncertainty still in forecast data whether this will materialize.

Bulk shear values remain very strong during the afternoon early
evening hours on Friday. If surface based instability can develop
(gfs is more strongly hinting at that), some strong to severe storms
would be capable of producing damaging winds as the surface low and
phased upper low pushes east into northwestern alabama. Either way,
elevated instability and low wet-bulb zero heights around 7000 feet
set the stage for hail up to the size of quarters as this occurs
in the mid afternoon hours. This threat could linger into the early
evening hours, as the surface and phasing upper low move through
northern alabama.

After midnight, rainfall will continue through Saturday on the back
side of the surface upper low. In all, through Saturday, between 1
and 1.5 inches of rainfall looks possible. This could cause some
quick rises on area river streams, but is not expected to produce
widespread flooding conditions. Cooler air will move in behind the
front surface low late Friday night into Saturday. Cloud cover and
precipitation also help to keep highs from climbing above the lower
50s. Cold air advection Saturday night should drop lows into the
lower 40s in most locations.

Long term (Saturday night through Wednesday)
issued at 313 pm cst Thu dec 13 2018
models suggest that strong north-northwest flow aloft will be in
place over the tn valley on Sunday, in the wake of an upper low
shifting east-northeastward across the southern appalachians. As the
deep-layer cyclone advances further eastward and a shortwave ridge
aloft translates across the region, winds throughout the vertical
column will subside even further during the period Sunday night-
Tuesday, before assuming a more pronounced southwesterly component on
Tuesday night and Wednesday. At the surface, we anticipate any
lingering light rain across northeastern al southern tn to end during
the morning hours on Sunday, with the southeastward advection of
drier air and lack of large scale forcing for ascent resulting in dry
conditions through at least the first half of the work week. Low
stratus clouds in the wake of the departing upper low should persist
well into the late afternoon hours on Sunday before clearing, which
along with northwest winds weak CAA will make for a cool day as temps
should only reach the lower 50s. Due to the predominately north
pacific origin of the incoming airmass and based on expectations of
mostly clear skies, highs on Monday-Wednesday should easily reach the
m-u 50s, with lows cooling into the 30-35 degree range each morning.

Aviation (for the 12z tafs through 12z Friday morning)
issued at 543 am cst Thu dec 13 2018
an approaching storm system will move eastward today and tonight,
bringing more clouds and higher rain chances to the area later this
evening at kmsl and around midnight at khsv. A tightening pressure
gradient will result in southeast winds increasing to the 12-20kt
range later this morning into the evening hours. Winds at 2000 ft
agl increase to nearly 40kt tonight, with the difference not
sufficient for a low level wind shear addition this issuance. Have
shower coverage becoming more numerous in the overnight, with cig vis
reductions to MVFR tonight, mainly around or after midnight. A break
in rainfall activity and lighter winds are expected after 12z
tomorrow. Some CIGS below 1000 feet could occur tomorrow between 12z
and 18z, but too far out in forecast to include at this time.

Hun watches warnings advisories
Al... None.

Tn... None.

Near term... Ktw
short term... Ktw
long term... 70 dd
aviation... Ktw
for more information please visit our website
at weather.Gov huntsville.

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Albertville, Albertville Municipal Airport, AL10 mi84 minE 610.00 miMostly Cloudy52°F33°F50%1019 hPa

Wind History from 8A0 (wind in knots)
Last 24hr--------S5CalmCalmCalmCalmS4SE5CalmSE4SE4CalmE5CalmSE6SE6
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW8
2 days agoN4N4NW11N8N5N4NW6NW4NW6N3CalmCalmCalmCalmW3CalmSW3W3NW3CalmCalmCalmCalmCalm

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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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 Huntsville, AL (16,3,4,5)
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Ground Weather Radar Station Northern Alabama
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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.