667
FXUS61 KPBZ 211724
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
124 PM EDT WED OCT 21 2026
WHAT HAS CHANGED
FROST ADVISORY IN EFFECT FROM 2AM TO 9AM THURSDAY
KEY MESSAGES
1) FROST ADVISORY IN EFFECT THURSDAY MORNING FOR PORTIONS OF THE
REGION. OTHERWISE, THE STRETCH FOR DRY WEATHER CONTINUES.
DISCUSSION
KEY MESSAGE 1...
OVER THE NEXT 24 HOURS, STRENGTHENING NORTHERLY FLOW WILL
PROMOTE LOWER DEW POINTS EARLY THURSDAY MORNING. COMBINED WITH
RADIATIONAL COOLING AND SUFFICIENT DRY AIR, TEMPERATURES ARE
EXPECTED TO FALL INTO THE LOW TO MID-30S, INCREASING THE
POTENTIAL FOR FROST. A FROST ADVISORY HAS BEEN ISSUED FOR
COUNTIES THAT HAVE NOT YET EXPERIENCED A HARD FREEZE.
ASIDE FROM THE POTENTIAL FOR FROST HEADLINES FRIDAY AND SATURDAY
NIGHTS AND PATCHY FOG EARLY IN THE MORNING, QUIET WEATHER IS
EXPECTED TO PERSIST UNDER HIGH PRESSURE THROUGH AT LEAST
MIDWEEK.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
A HIGH-CONFIDENCE VFR FORECAST CONTINUES THROUGH THE WEEK. LIGHT
WIND BECOMING CALM OVERNIGHT. RETURN TO LIGHT NORTHERLY WIND
TOMORROW. THE ONLY LOCALIZED IMPACT WILL BE MORNING RIVER VALLEY FOG
WITH HLG/FKL BEING THE MOST LIKELY TO HAVE IMPACTS BETWEEN 11Z AND
13Z.
OUTLOOK...
OUTSIDE OF ANY MORNING RIVER VALLEY FOG, VFR IS HIGHLY LIKELY
THROUGH SUNDAY UNDER HIGH PRESSURE.
PBZ WATCHES/WARNINGS/ADVISORIES
PA...FROST ADVISORY FROM 2 AM TO 9 AM EDT THURSDAY FOR PAZ020-021-
029-031-073-075.
OH...FROST ADVISORY FROM 2 AM TO 9 AM EDT THURSDAY FOR OHZ039>041-
048>050-057>059-068-069.
WV...FROST ADVISORY FROM 2 AM TO 9 AM EDT THURSDAY FOR WVZ001>004-
012-021-509-510.
DISCUSSION...HEFFERAN
AVIATION...LUPO
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