UNITED STATES — THE UPPER-MIDWEST HEAVY-RAIN EVENT SLIPPED TUE-WED TO THU-FRI (SLIGHT / 15 PERCENT, SEP 17); FLOOD WARNINGS NEAR ZERO AT 2 BUT WATCHES JUMPED 4 TO 11
BUILDING · September 15, 2026 · NO. 0915
THE WATER
The deferral that defines the day on the American board. The prediction centre's discussion keys a Slight, 15 percent excessive-rain risk for Thursday Sep 17 over Nebraska, South Dakota and the Upper Midwest, shifting east toward the Upper Midwest and Great Lakes Friday — the event the last edition timed for Tue–Wed. Meanwhile Flood Warnings sit at 2, both minor Florida rivers, while Flood Watches rose 4 to 11 across New Mexico, Colorado, Iowa, Nebraska, Kansas, Missouri and Alaska. The watch board is the pre-staging; the warning board is the lull.
THE RECORD
30 turning points on record since Jul 18 — the 8 most recent shown.
Sep 15active → building
Sep 13↑ firmed
Sep 12▽ slipped down the board
Sep 11building → active
Sep 8easing → building
Aug 28active → easing
Aug 27easing → active
Aug 24▽ slipped down the board
WHO IT TOUCHES
Public safetysix national warning systems live at once, and the lead time is different in every one
Supply chainsa delta corridor flooding, two rivers too low to load, and a crosswind ramp building on a motorway
Farmharvest-window decisions on four continents, and the rain is early in some and late in others
Aviationa quiet day at the hubs, with the disruption booked for midweek
CONNECTED
The alert board emptied and the watch board loaded, on the same map, in the same twelve hours.
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