Monday, August3, 2020
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Marine Weather and Tides
Knoxville, TN

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:43AMSunset 8:39PM Monday August 3, 2020 2:17 PM EDT (18:17 UTC) Moonrise 8:05PMMoonset 5:29AM Illumination 100% Phase: Full Moon; Moon at 14 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 Knoxville, TN
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location: 35.97, -83.95     debug


Area Discussion for - Morristown, TN
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FXUS64 KMRX 031703 AFDMRX

AREA FORECAST DISCUSSION National Weather Service Morristown TN 103 PM EDT Mon Aug 3 2020

UPDATE. FOR 18Z AVIATION.

DISCUSSION. Area radars and satellite imagery shows showers and a few thunderstorms continues to move across the forecast area late this morning. Most of this activity has been in response to deep synoptic scale lift in association with deep mid-upper level troughing across the eastern US. A couple of disturbance have been moving through southwesterly flow aloft aiding in increased upper level divergence. A low level boundary remains draped across the area with much drier air to the west. Isentropic ascent as seen on the 310K surface has likely aided in more coverage of showers across NE Tennessee and SW Virginia where higher isentropic adiabatic omega is observed and lower condensation pressure deficits. Much of this activity is waning per warming cloud tops and decrease in lightning activity as the main disturbance lifts to the north and more neutral pressure advection on the 310K surface begins to move into the area.

Should begin to see a lull in precipitation late this morning and early this afternoon as we lose better synoptic scale forcing. During this lull, the atmosphere should begin to recover with increasing temperatures across the boundary layer. Slightly cooler mid level temperatures spreading across a warm boundary layer will increase lapse rates and yield CAPE values in excess of 1500-2000 j/kg by the afternoon. Upper level height falls will overspread the region today as another disturbance moves through the region. The end result should be convection firing again this afternoon. Have some uncertainty on the actual coverage of convection this afternoon as the atmosphere remains worked over, but believe the best chances reside closer to the Appalachian mountains and east of I-75 and I-81. Adjusted PoPs this afternoon accordingly with a tight gradient in PoPs. Main concern with any thunderstorm potential will be heavy rain and localized flash flooding as PW values remain high and shear vectors orient parallel to the boundary. Cloud bearing flow should remain high enough to keep convection moving enough to limit coverage of flooding issues thus see no need to issue a flood watch at this time. Cant rule out a couple of strong storms as increased upper flow results in better shear and storm organization. Main hazards will be strong gusty winds and maybe pea to penny size hail.

Only other update was to temperatures this afternoon as precipitation has modified forecast hourly temperatures. Lowered highs only a few degrees given the amount of cloud cover and precipitation. Will send an updated ZFP soon.

Diegan

AVIATION. 18Z TAF DISCUSSION.

For this afternoon, isolated to possible scattered convection will be possible that could impact CHA/TYS/TRI. VFR conditions should prevail through the afternoon and early night although lowered CIGS and visb is possible near and around SHRA/TSRA. This activity will clear out tonight. Guidance has been persistent for fog developing at TYS and TRI with IFR conditions possible between 11Z and 13Z. Any fog will dissipate with sunrise. May see some development of SHRA towards the end of the TAF period at CHA, but most locations remain dry. Winds will remain light through the period.

Diegan

PRELIMINARY POINT TEMPS/POPS. Chattanooga Airport, TN 69 89 67 91 68 / 30 30 20 20 10 Knoxville McGhee Tyson Airport, TN 67 87 66 89 66 / 40 40 30 20 20 Oak Ridge, TN 66 86 65 88 65 / 40 40 30 20 20 Tri Cities Airport, TN 63 84 62 85 63 / 40 50 40 40 30

MRX WATCHES/WARNINGS/ADVISORIES. NC . NONE. TN . NONE. VA . NONE.


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Knoxville, McGhee Tyson Airport, TN11 mi24 minN 010.00 miMostly Cloudy79°F66°F65%1015.1 hPa
Oak Ridge, TN15 mi24 minS 310.00 miPartly Cloudy82°F68°F63%1014.8 hPa

Link to 5 minute data for KTYS

Wind History from TYS (wind in knots)
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Last 24hrW8W6W6NW7W7NW3N3N3E3CalmNE3CalmNE3CalmNE3N4N4NE3E6CalmS3NE5NE3Calm
1 day agoS16
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2 days agoSW11SW9
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E6E4NE3N6NE3CalmNE3CalmCalmCalmCalmN3NE3CalmCalmS7S13S15
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS 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 Morristown, TN (14,3,4,5)
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Ground Weather Radar Station Knoxville/Tri Cities, TN
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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 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 numerous 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.