THE FOUR CORNERS — POLO'S MOISTURE BRINGS A MODERATE FLOOD RISK MONDAY

On the board · September 27, 2026 →

BUILDING · September 27, 2026 · NO. 0927

THE WATER

A moderate risk of excessive rain covers the Southwest and Four Corners on Monday as moisture ahead of Polo streams north-east. On Tuesday the moderate risk runs from south-eastern Arizona to the Texas Panhandle, with numerous flash floods possible. Today a nor'easter still brings 1 to 3 inches from eastern Massachusetts to New York City.

THE RECORD

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

Sep 26active → building

Sep 25easing → active

Sep 24peak → easing

Sep 23building → peak

Sep 22active → building

Sep 21▽ slipped down the board

Sep 19building → active

Sep 18cresting → building

WHO IT TOUCHES

Public safetyA hurricane warning for Baja California Sur, a typhoon at Okinawa, a moderate flood risk ahead for the US Southwest and red alerts in Chile and Saudi Arabia.

Energy & utilitiesGrids in Baja California Sur and north-western Mexico, and Okinawa's islands under typhoon winds.

Supply chainsA landfall on Baja California Sur, then flash-flood risk on the freight corridors from Arizona to the Texas Panhandle, and a Rhine gauge below zero.

AgricultureHeavy rain ahead for the southern High Plains, record rain in Chile's arid north, and hail risk in western Nebraska.

Live events & venuesA lingering nor'easter from New York City to eastern Massachusetts and a stormy Sunday in Bangkok.

CONNECTED

One hurricane, two countries — Polo's wind reaches Baja California Sur on Monday.

WHAT THEY'RE SAYING

Forecasters have outlined a moderate risk of excessive rainfall and flash flooding on Monday in the Four Corners region, tied to moisture from the system. Several communicators noted that the same moisture could produce widespread flooding problems extending into the Plains, aligning with the official outlook while underscoring the scale of the threat.

MSMark Sudduth@hurricanetrackchaserSep 26Forecasters indicate moderate excessive rainfall risk Monday in Four Corners area with potential for flash flooding.
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MSMark Sudduth@hurricanetrackchaserSep 26Moisture transport is expected to cause widespread flooding problems in the region.
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RO@RockCo_TrafficSep 25Heavy rain and tropical moisture threaten flooding across Four Corners states into the Plains next week.
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