137
FXUS64 KMRX 201117
AFDMRX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
717 AM EDT TUE OCT 20 2026
..NEW AVIATION
KEY MESSAGES
UPDATED AT 715 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
(12Z TAFS)
ISSUED AT 715 AM EDT TUE OCT 20 2026
VFR TAFS EXPECTED TO CONTINUE WITH PERSISTENCE THE RULE. A WEAK
IMPULSE TO BRING HIGH CLOUDS TODAY BUT NO CONCERNS. CANNOT RULE
OUT A WEAK GUST AT KCHA, BUT WINDS EXPECTED TO REMAIN LIGHT
OTHERWISE.
PRELIMINARY POINT TEMPS/POPS
CHATTANOOGA AIRPORT, TN 74 49 76 49 / 0 0 0 0
KNOXVILLE MCGHEE TYSON AIRPORT, TN 75 46 76 45 / 0 0 0 0
OAK RIDGE, TN 75 47 76 46 / 0 0 0 0
TRI CITIES AIRPORT, TN 74 40 74 40 / 0 0 0 0
MRX WATCHES/WARNINGS/ADVISORIES
NC...NONE.
TN...NONE.
VA...NONE.
DISCUSSION...KS
AVIATION...WELLINGTON
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