713
FXUS64 KMRX 200540
AFDMRX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
140 AM EDT TUE OCT 20 2026
..NEW DISCUSSION, AVIATION
KEY MESSAGES
UPDATED AT 138 AM EDT TUE OCT 20 2026
- DRY WEATHER DOMINATES THE FORECAST PERIOD, WITH COOL MORNINGS
AND PLEASANT AFTERNOONS EACH DAY. AFTERNOON RELATIVE HUMIDITY
WILL REMAIN ON THE LOWER SIDE AS WELL.
DISCUSSION
ISSUED AT 138 AM EDT TUE OCT 20 2026
ISOLATED PATCHY FROST FOR PARTS OF FAR NORTHEAST TN AND SOUTHWEST VA
THIS MORNING. INCREASING MORNING LOWS WILL DIMINISH THE POTENTIAL
FOR FROST DEVELOPMENT FOR MOST. HOWEVER, DENSE FOG NEAR WATERWAYS
COULD BE POSSIBLE WITH COLDER AIR OVER TOP WARMER WATERS IN LAKES
AND RIVERS.
FOR THE WEEK AHEAD, LONGWAVE TROUGHING WILL REMAIN WELL INTO CANADA
WITH RIDGING POKING NORTH BETWEEN A CLOSED UPPER LOW OFF OF THE MID-
ATLANTIC AND ANOTHER CLOSED LOW OFF OF THE WEST COAST. A PSEUDO-
OMEGA BLOCK PATTERN. THE WESTERN LOW EVENTUALLY PHASES WITH THE MEAN
FLOW, MEANWHILE THE ATLANTIC ONE EXPECTED TO BRING COASTAL ISSUES TO
PARTS OF THE EASTERN SEABOARD DUE TO HARDLY ANY MOVEMENT, WILL
BECOME ENVELOPED AND SHUNTED EAST TOWARDS THE END OF THE WEEK. NO
IMPACTS HERE EXCEPT PERSISTENT UPPER LEVEL RIDGING AND SURFACE HIGH
PRESSURE.
HIGHS WILL REMAIN IN THE LOW TO MID (SOME UPPER) 70S RANGE THE REST
OF THE FORECAST PERIOD INTO EARLY NEXT WEEK. A GENERAL
WASH/RINSE/REPEAT EACH DAY WITH LIGHT WINDS, MOSTLY SUNNY/CLEAR
SKIES, LOW HUMIDITY, AND NO PRECIPITATION FOR AT LEAST THE
FORESEEABLE FUTURE.
AVIATION
(06Z TAFS)
ISSUED AT 138 AM EDT TUE OCT 20 2026
PERSISTENCE FORECAST WITH CLEAR SKIES, LIGHT WINDS, DRY WEATHER,
AND VFR CONDITIONS. CANNOT RULE OUT THE CHANCE FOR RIVER FOG
BETWEEN 9Z AND 13Z AS WAS SEEN YESTERDAY, BUT NOT CONFIDENT TO
INCLUDE IN THE TAFS.
PRELIMINARY POINT TEMPS/POPS
CHATTANOOGA AIRPORT, TN 74 49 76 50 / 0 0 0 0
KNOXVILLE MCGHEE TYSON AIRPORT, TN 75 46 75 47 / 0 0 0 0
OAK RIDGE, TN 75 47 76 48 / 0 0 0 0
TRI CITIES AIRPORT, TN 74 41 73 42 / 0 0 0 0
MRX WATCHES/WARNINGS/ADVISORIES
NC...NONE.
TN...NONE.
VA...NONE.
DISCUSSION...KS
AVIATION...WELLINGTON
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