Sunday, March26, 2017

Marine Weather and Tides
Shepherdsville, KY

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 7:33AMSunset 8:02PM Sunday March 26, 2017 2:47 PM EDT (18:47 UTC) Moonrise 5:53AMMoonset 5:37PM Illumination 1% Phase: Waning Crescent; Moon at 29 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Shepherdsville, KY
   Hourly   EDIT   Help
location: 38, -85.7     debug

Area Discussion for - Louisville, KY
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 klmk 261738
area forecast discussion
national weather service louisville ky
138 pm edt Sun mar 26 2017

Updated aviation discussion...

Forecast update
Issued at 1055 am edt Sun mar 26 2017
the morning showers are persisting across our eastern cwa, but will
continue to lift out of the area over the next couple of hours. Back
to the west, we are seeing a lull in activity as mid level dry punch
is working in. This does not mean the end of the showers, however as
low to mid level lapse rates will remain steep ahead of the next
vort MAX rotating around the parent upper low near the quad cities.

Latest mesoanalysis does show a small amount of instability
developing back to the west where precipitation has ended, and data
continues to suggest that up to 500 j/kg of CAPE will develop by
midday into the afternoon. Model guidance depicts the development of
scatted to numerous showers and a few storms by early to mid
afternoon, especially across southern in. Given the steep low and
mid level lapse rates, there should be enough instability for some
thunderstorms and the potential for gusty winds (~30-40 mph) to
accompany them. In addition, a small hail threat isn't out of the
question given low freezing levels around 8 k feet, although storm
tops will likely be capped at around 15k feet given strong mid level
subsidence. Also think it is worth mentioning that the vertical wind
profile below the equilibrium level would be supportive of a few
organized updrafts, if instability ends up being sufficient. In this
case, a few stronger organized storms are possible where higher wind
gusts (in the sps range) might be possible. Will have to monitor
early afternoon trends.

Short term (this afternoon through Monday evening)
issued at 300 am edt Sun mar 26 2017

Strong to severe storms possible Monday...

stacked low pressure was centered over northeast missouri early this
morning, with a long band of showers stretching from the gulf coast
to the ohio valley. The showers are located just ahead of the
negatively-tilted trough, which will continue to swing into the
region this morning. Closest lightning activity was in western tn,
near the surface boundary and under more of an influence from cold
pool aloft. Lightning does not look likely early this morning with
minimal instability and moist-adiabatic lapse rates. Ongoing steady
band of light to moderate showers will gradually lift northeast of
the forecast area by 12z.

After sunrise, activity looks to be more scattered in nature with
some potential for isolated thunder. Instability is still quite
marginal, but can't rule out lightning completely as temps aloft
cool. Without widespread showers during the daytime, highs in most
places should recover into the upper 60s to around 70 degrees. A
brief period of dry weather is expected late this evening into early
Monday. Very brief shortwave ridging will push through the ohio
valley ahead of a low pressure system in the plains. Lows tonight
will be in the upper 40s to mid 50s.

A progressive shortwave trough swings into the ohio valley on
Monday. There is medium-high forecast confidence in a surface low
moving from NW arkansas at 12z Mon to indiana by late Monday
evening. A 35 kt SW LLJ noses through the forecast area during the
afternoon and evening hours. Latest forecast soundings suggest
moderate buoyancy will develop with a capping inversion in place
through 18z or so. Dewpoints are forecast to rise into the mid and
upper 50s. 0-6 km shear looks to be around 35-40 kts. There is also
a fair amount of shear (25 kts) in the lowest 1 km, and effective
srh peaks around 200 m2/s2 during the afternoon and evening. Strong
to severe storms are possible with this environment, including
damaging wind gusts, hail, heavy rain, and an isolated tornado.

Long term (after midnight Monday night through Saturday)
issued at 340 pm edt Sat mar 25 2017
showers could linger east of i-65 Tuesday morning as low pressure
departs to the east. In general, upper level ridging will keep
central ky and southern in mostly dry Tuesday and Wednesday. Highs
Tuesday and Wednesday will be in the mid 60s to low 70s. Morning
lows are expected to be in the mid 40s to low 50s.

The weather turns active once again late this week. Showers and
thunderstorms appear most likely thu, Thu night, and Friday as a
deep upper level trough moves into the region. Forecast confidence
regarding the detailed evolution of this low pressure system remains
low. The latest ECMWF features an evolution that is most consistent
with the recent pattern, with ridging across the NE us and a surface
track to the north of the forecast area. However, the latest gfs
suppresses the system further south, right through the ohio valley.

For now, will feature likely rain chances, a slight chance for
thunder, and highs generally in the 60s to around 70 degrees.

The weekend looks pretty quiet with high pressure and drier air
returning to the ohio valley. Blended guidance suggests highs in the
60s, with Sunday warmer than Saturday.

Aviation (18z TAF issuance)
issued at 130 pm edt Sun mar 26 2017
MVFR conditions should prevail this afternoon at all TAF sites with
at least on and off light rain showers possible. Feel that sdf/lex
could see a better cluster of convection between about 21-3z time
frame which may contain some embedded t-storms so did include vcts
at sdf/lex. Also for this afternoon SW winds will continue to be
gusty up to 20 kts.

This evening all tafs should goVFR. The next concern may be some
light fog developing late tonight into tomorrow morning. There is
an MVFR signal in the models for light fog, but fog formation will
depend on the amount of cloud cover and strength of the inversion.

Right now kept the tafs on the more optimistic side concerning fog
due to winds aloft looking a mixey and at least some mid-upper level
clouds present.

The next round of convection should begin near bwg tomorrow morning
after sunrise and will work its way NE throughout the day. Winds
will back to a more sse direction tomorrow morning.

Lmk watches/warnings/advisories
In... None.

Ky... None.

Update... Bjs
short term... Ebw
long term... Ebw
aviation... Ams

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Louisville, Standiford Field, KY13 mi51 minSSW 12 G 1810.00 miMostly Cloudy68°F53°F59%1013.4 hPa
Louisville, Bowman Field Airport, KY16 mi54 minSW 810.00 miMostly Cloudy67°F53°F61%1013.6 hPa
Fort Knox, KY16 mi49 minSSW 910.00 miMostly Cloudy65°F55°F72%1013.6 hPa

Wind History from SDF (wind in knots)
Last 24hrS21
1 day agoSW17
2 days agoSE4SE6S10S10S8S6S6SE9SE5SE4S11S11S12

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
IR Satellite Image from GEOS

GOES Local Image of Midwest    EDIT

Wind Forecast for Louisville, KY (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Louisville, KY
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.