573
FXUS63 KIWX 202200
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
600 PM EDT MON APR 20 2026
KEY MESSAGES
- A RETURN TO WELL ABOVE NORMAL TEMPERATURES STARTS TUESDAY.
- THERE IS A 30% TO 40% CHANCE OF SHOWERS, AND PERHAPS A
THUNDERSTORMS, TUESDAY NIGHT. BETTER CHANCES (70-90%) OF
SHOWERS AND STORMS FRIDAY.
DISCUSSION
ISSUED AT 104 PM EDT MON APR 20 2026
AFTER A COLD START TO THE DAY, TEMPS HAVE REBOUNDED SOMEWHAT INTO
THE 40S AND EVENTUALLY SOME 50S AS THE CAA WANES AND SHIFTS EAST. A
RAPID RETURN OF WARMER AIR COMMENCES TONIGHT AND THROUGH THE
REMAINDER OF THE WEEK WITH THE ONLY HICCUP BEING A WEAK DISTURBANCE
AND ASSOCIATED SFC COLD FRONT THAT PUSHES THROUGH TUESDAY NIGHT WITH
SCATTERED SHOWERS (ISOLATED STORM?) AS STEEPING LAPSE RATES AND A
BIT OF AN EML SETTLE IN WITH SOME UPPER LEVEL SUPPORT. NO SEVERE
WEATHER IS EXPECTED AND OVERALL RAIN AMOUNTS SHOULD NOT BE
SIGNIFICANT.
WEDNESDAY INTO MOST OF THURSDAY NIGHT WILL FEATURE DRY AND MUCH
WARMER CONDITIONS AS A CLOSED LOW MOVES ALONG THE INTERNATIONAL
BORDER TOWARDS THE AREA. A FEW SHOWERS OR STORMS COULD ARRIVE LATE
THURSDAY NIGHT IN THE WEST, BUT BETTER CHANCES LOOK TO OCCUR ON
FRIDAY WITH LIKELY TO CAT POPS WARRANTED AHEAD OF THIS FEATURE.
PWATS OVER 1" MAY SIGNAL SOME LOCALLY HEAVY RAIN CONCERNS, BUT THE
SYSTEM APPEARS TO BE RATHER PROGRESSIVE SO HOPEFULLY THIS DOESN'T
BECOME AN ISSUE.
TEMPERATURES WILL THEN DROP BACK TO MORE SEASONABLE LEVELS FOR THIS
WEEKEND.
AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/
ISSUED AT 600 PM EDT MON APR 20 2026
VFR CONDITIONS EXPECTED TO PERSIST THROUGH THE TAF CYCLE. WINDS
WILL REMAIN LIGHT TONIGHT AND THEN PICK UP OUT OF THE SOUTHWEST
IN ADVANCE OF A COLD FRONT DURING THE DAY ON TUESDAY WITH GUSTS
TO NEAR 25 KNOTS AT TIMES. THIS COLD FRONT THEN ARRIVES JUST
BEYOND THIS PERIOD (TUESDAY NIGHT) WITH CHANCES FOR SHOWERS/STORMS
AND FLIGHT RESTRICTIONS.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...FISHER
AVIATION...STEINWEDEL
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