264
FXUS63 KIWX 190025
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
825 PM EDT SAT APR 18 2026
KEY MESSAGES
- SHOWERS HAVE MOVED EAST OF THE AREA EARLIER TODAY ALLOWING
DRY WEATHER TO PREVAIL.
- UNSEASONABLY COOL WEATHER WILL BRING THE LIKELIHOOD OF FROST
AND FREEZING TEMPERATURES TONIGHT AND SUNDAY NIGHT.
- COOL SUNDAY AND MONDAY, THEN MUCH WARMER TUESDAY THROUGH
FRIDAY WITH HIGHS IN THE 70S AND 80S.
DISCUSSION
ISSUED AT 1201 PM EDT SAT APR 18 2026
STRONG COLD AIR ADVECTION WAS BEHIND A COLD FRONT THAT HAD
MOVED EAST OUT OF NORTHERN INDIANA. UPSTREAM DEW POINTS BEHIND
THE FRONT WERE IN THE LOW TO MID 30S. THIS IS A CLASSIC SET UP
FOR VERY CHILLY EARLY MORNING TEMPERATURES THE NEXT TWO NIGHTS
WITH WINDS BECOMING LIGHT AND WITH THE DRY AND CHILLY ARE OVER
THE FORECAST AREA. IN THIS REGARD, AFTER COLLABORATION WITH
SURROUNDING OFFICES, HAVE ISSUED A FROST ADVISORY AND A FREEZE
WATCH FOR TONIGHT AND TOMORROW NIGHT RESPECTIVELY. LOWS TONIGHT
ARE EXPECTED TO BE BETWEEN 33 AND 35 DEGREES. LOWS SUNDAY NIGHT
WILL RANGE FROM THE MID TO UPPER 20S NEAR THE MICHIGAN BORDER TO
AROUND 30 DEGREES FARTHER SOUTH.
VERY MILD WEATHER IS AHEAD THIS UPCOMING WEEK WITH HIGHS IN THE
70S AND 80S AS UPPER LEVEL RIDGING BUILDS OVER THE EASTERN CONUS
DOWNSTREAM OF AN UPPER LEVEL TROF OVER THE WEST COAST. BOTH THE
ECMWF AND GFS 850 MB TEMPERATURE ANOMALIES ARE VERY IMPRESSIVE
IN THE +8C TO +14C RANGE PER GFS; FULLY SUPPORTIVE OF THESE
WARM TEMPERATURES. PRECIPITABLE WATER VALUES SURGE NORTH LATE
FRIDAY AND SHOULD BE CLOSE TO 1.50" FRIDAY NIGHT. SOME CONCERN
FOR A THUNDERSTORM COMPLEX THAT MAY DEVELOP UPSTREAM AND MOVE
INTO THE WESTERN PART OF THE FORECAST AREA LATE THIS WEEK, BUT
AT THIS TIME UNCERTAINTY IS TOO LOOK TO ATTEMPT TO INCLUDE IN
THE FORECAST AT THIS TIME.
AVIATION /00Z TAFS THROUGH 00Z MONDAY/
ISSUED AT 818 PM EDT SAT APR 18 2026
VFR PREVAILS. CLEARING SKIES EXPECTED OVERNIGHT W/ LIGHT WINDS
AT BOTH KSBN AND KFWA. CLOUDS INCREASING AGAIN ON SUNDAY WITH 5K
TO 10K FOOT CEILINGS EXPECTED ON SUNDAY AFTERNOON. WIND GUSTS 25
TO 30 KNOTS LIKELY AT BOTH TERMINALS BETWEEN 15Z AND 21Z.
IWX WATCHES/WARNINGS/ADVISORIES
IN...FROST ADVISORY FROM MIDNIGHT EDT /11 PM CDT/ TONIGHT TO 9 AM
EDT /8 AM CDT/ SUNDAY FOR INZ005>009-012>015-017-018-020-
022>027-032>034-103-104-116-203-204-216.
FREEZE WATCH FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING FOR
INZ005>009-012>015-017-018-020-022>027-032>034-103-104-
116-203-204-216.
OH...FROST ADVISORY FROM MIDNIGHT TONIGHT TO 9 AM EDT SUNDAY FOR
OHZ001-002-004-005-015-016-024-025.
FREEZE WATCH FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING FOR
OHZ001-002-004-005-015-016-024-025.
MI...FROST ADVISORY FROM MIDNIGHT TONIGHT TO 9 AM EDT SUNDAY FOR
MIZ078>081-177-277.
FREEZE WATCH FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING FOR
MIZ078>081-177-277.
MARINE...SMALL CRAFT ADVISORY UNTIL 2 AM EDT SUNDAY FOR LMZ043-046.
DISCUSSION...SKIPPER
AVIATION...HAMMER
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