769
FXUS63 KIWX 181021
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
621 AM EDT FRI SEP 18 2020
SYNOPSIS
ISSUED AT 249 AM EDT FRI SEP 18 2020
MUCH COLDER TEMPERATURES WILL BE FELT INTO THE WEEKEND WITH
TEMPERATURES MUCH BELOW NORMAL. HIGHS TODAY WILL ONLY BE IN THE
60S, AND LOWS TONIGHT WILL FALL INTO THE 30S, WITH POTENTIAL
FROST. TEMPERATURES WILL START TO REBOUND ON SUNDAY, AND WARM
THROUGH MID-WEEK. THE NEXT CHANCE FOR RAIN WILL BE THURSDAY.
SHORT TERM
(TODAY AND TONIGHT)
ISSUED AT 249 AM EDT FRI SEP 18 2020
COLD UPPER LEVEL TROUGHING AND SURFACE HIGH PRESSURE WILL KEEP THE
AREA COOL YET DRY TODAY, WITH HIGHS ONLY IN THE MID 60S. WINDS
WILL BE NORTHEAST AND SLIGHTLY BREEZY, BUT WILL DIMINISH TO AROUND
5 MPH AFTER SUNSET. THESE LIGHT WINDS AND CLEAR SKIES WILL COMBINE
TO PRODUCE GOOD RADIATIONAL COOLING CONDITIONS, AND TEMPERATURES
ARE EXPECTED TO FALL INTO THE 30S ACROSS THE FORECAST AREA. FROST
WILL THEREFORE BE POSSIBLE, ESPECIALLY TO THE NORTHEAST, AND A
FROST ADVISORY IS BEING ISSUED FOR LATE TONIGHT INTO SATURDAY
MORNING.
LONG TERM
(SATURDAY THROUGH THURSDAY)
ISSUED AT 249 AM EDT FRI SEP 18 2020
UPPER TROUGHING WILL START TO SHIFT EAST ON SATURDAY, AND HIGH
PRESSURE RIDGING WILL BUILD IN FROM THE SOUTHWEST GOING INTO THE
FIRST PART OF NEXT WEEK. TEMPERATURES WILL GRADUALLY WARM DURING
THIS PERIOD, GETTING INTO THE UPPER 70S TO NEAR 80 BY WEDNESDAY,
WITH DRY CONDITIONS PERSISTING. TROUGHING RETURNS ON THURSDAY
WITH MODELS BRINGING A SHORTWAVE INTO THE REGION. THERE IS STILL A
LOT OF UNCERTAINTY THOUGH WITH MODEL DIFFERENCES IN LOCATION AND
AMOUNT OF MOISTURE. DECIDED TO KEEP THE SLIGHT CHANCE OF SHOWERS
SUPPORTED BY THE NBM AND CANADIAN, ALTHOUGH THIS MAY END UP BEING
ANOTHER MOSTLY DRY FRONT.
AVIATION
(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 614 AM EDT FRI SEP 18 2020
THERE IS LITTLE CHANGE TO THE TAFS FOR THIS ISSUANCE. WINDS PICK
UP A BIT AT SBN LATER THIS MORNING. VFR THROUGH THE TAF PERIOD
WITH HIGH PRESSURE IN PLACE.
IWX WATCHES/WARNINGS/ADVISORIES
IN...FROST ADVISORY FROM 2 AM EDT /1 AM CDT/ TO 9 AM EDT /8 AM CDT/
SATURDAY FOR INZ003>009-012>018-020-022>027-032>034.
BEACH HAZARDS STATEMENT UNTIL 3 PM CDT THIS AFTERNOON FOR INZ003.
MI...FROST ADVISORY FROM 2 AM TO 9 AM EDT SATURDAY FOR MIZ077>081.
BEACH HAZARDS STATEMENT UNTIL 8 AM EDT THIS MORNING FOR MIZ077.
OH...FROST ADVISORY FROM 2 AM TO 9 AM EDT SATURDAY FOR OHZ001-002-004-
005-015-016-024-025.
LM...SMALL CRAFT ADVISORY UNTIL 4 PM EDT THIS AFTERNOON FOR LMZ046.
SYNOPSIS...COBB
SHORT TERM...COBB
LONG TERM...COBB
AVIATION...BROWN
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