THE FOUR CORNERS — POLO'S MOISTURE BRINGS THREE DAYS OF FLOOD RISK

On the board · September 29, 2026 →

BUILDING · September 29, 2026 · NO. 0929

THE WATER

A moderate flood risk covers the Southwest today, from the Arizona–Nevada border to the Four Corners, with 1 to 3 inches on saturated soils, burn scars and slot canyons. It moves to south-eastern Arizona through south-eastern Colorado on Wednesday and the central and southern High Plains on Thursday; 36 flood watches and 7 flash-flood warnings are already in force.

THE RECORD

42 turning points on record since Jul 18 — the 8 most recent shown.

Sep 28↑ firmed

Sep 27↑ intensified sharply

Sep 26active → building

Sep 25easing → active

Sep 24peak → easing

Sep 23building → peak

Sep 22active → building

Sep 21▽ slipped down the board

WHO IT TOUCHES

Public safetyA hurricane's second landfall in Sonora, 2.6 million flood-affected in Thailand, and three days of flood risk in the US Southwest.

AviationPolo over Sonora's airports, Surigae's approach toward Tokyo, and heavy rain across the Southwest.

Energy & utilitiesHurricane-force wind on Sonora's grid, and flash floods over Southwest infrastructure.

Supply chainsBangkok under water for a second week, Mexico's north-west corridors under a hurricane, and a low Rhine.

AgricultureSonora and Sinaloa farmland under Polo's rain, flood risk on the High Plains, and Thai rice provinces under water.

Live events & venuesSchools shut in Bangkok, a wet week for Southwest venues, and a red warning on the Tarragona coast.

CONNECTED

One hurricane, two afterlives — Polo's core reaches Sonora this morning while its moisture drives three days of flood risk from the Southwest to the High Plains..

WHAT THEY'RE SAYING

Moisture from Polo and Odalys is driving a multi-day flood threat across the Four Corners, where rain on already wet ground is expected to produce flash flooding and broader overflow. Estimates of totals range from one to three inches in some accounts to as much as five to eight inches in New Mexico and Colorado, with the higher figures tied to more widespread and repeated downpours through Wednesday. Local emergency officials are preparing for the impacts in counties such as San Juan as the plume moves in.

MVMax Velocity@MaxVelocityWXexplainerSep 28Tropical moisture from Polo and Odalys raises flash flood risk across the Four Corners with one to three inches of rain on wet ground.
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RTReed Timmer@ReedTimmerUSAchaserSep 28Polo's moisture plume may bring five to eight inches of rain and multi-day flooding to New Mexico and Colorado through Wednesday.
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KO@KOB4Sep 28Emergency officials in San Juan County prepare for possible flooding from rain in the Four Corners.
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CN@CNNweatherSep 28Hurricane moisture from Odalys and Polo is driving a multi-day flood threat across the Four Corners.
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