Area Forecast Discussion
Issued by NWS Knoxville/Tri Cities, TN

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000 FXUS64 KMRX 141459 AFDMRX Area Forecast Discussion National Weather Service Morristown TN 1059 AM EDT Thu Sep 14 2017 .DISCUSSION...
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Morning satellite and surface observations show the remnant low of Irma located across SE Ohio. WV imagery indicates dry air and subsidence aloft across the Tennessee Valley and this is reflected in forecast soundings showing very shallow moisture and an inversion near 600mb. A few areas of vorticity maxima are rotating around the low this morning helping to generate a few light rain showers across the region, but lift is very weak. As the day progresses, this low should move to the northeast taking the best lift with it. This will result in decreasing rain chances through the afternoon with some clearing sky conditions expected from SW to NE across the forecast area this afternoon. However, cannot rule out a few light rain showers remaining across northeast TN/southwest VA late this afternoon and into the early overnight hours. Made no adjustments to the temperature and dew point forecast because they are right on track with current observations. Adjusted PoPs to indicate decreasing chances of rain through the afternoon, especially across southwestern portions of the forecast area. Also went ahead and added mention of fog to the grids for late tonight and early Friday morning with abundant low-level moisture and decreasing cloud cover.
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&& .PRELIMINARY POINT TEMPS/POPS...
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Chattanooga Airport, TN 78 63 83 65 / 20 0 0 0 Knoxville McGhee Tyson Airport, TN 75 61 82 62 / 50 10 0 0 Oak Ridge, TN 74 60 82 63 / 50 10 0 0 Tri Cities Airport, TN 71 56 79 57 / 50 20 10 0
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&& .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && $$ JB

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