9/17/26 - Iowa El Niño Outlook

00:00:42 — Iowa weather history for September 17: a dramatic 1912 transition from record late-season heat to early snow and flurries.

00:01:17 — Weather trivia: How does Des Moines precipitation from September 1–14 rank historically?

00:02:22 — Near-term Iowa forecast: continued chances for rain and thunderstorms through Monday, with the heaviest potential rainfall in northeastern Iowa and a marginal severe-weather risk from southwest into central Iowa Friday night into Saturday.

00:03:44 — CPC 8- to 14-day outlook: warmer-than-normal temperatures favored statewide, with mixed precipitation signals across Iowa.

00:05:01 — October outlook: slightly increased odds of above-normal temperatures in Iowa, while precipitation has equal chances of being above, near, or below normal.

00:06:17 — Why the October precipitation outlook shows a wetter signal to Iowa's southwest, and why drought-stricken neighboring states could welcome that moisture.

00:07:30 — Three-month outlook for October through December: warmer conditions favored, with equal precipitation chances in eastern Iowa and a slightly wetter signal in western Iowa.

00:07:58 — El Niño update and Iowa winter implications: how current Pacific sea-surface temperature anomalies compare with historic strong El Niño events.

00:10:18 — Choosing El Niño analog years: why more recent strong events may be more relevant than older events when accounting for a warmer modern climate.

00:12:38 — Classic El Niño precipitation pattern, jet-stream placement, and the potential for wet conditions extending from the Gulf states into the Midwest.

00:13:17 — Winter weather under strong El Niño: a generally warmer signal, but potential for late-January and February cold-air outbreaks, episodic snowstorms, rain, and mixed-precipitation events.

00:15:32 — Other climate drivers beyond El Niño, including the Madden-Julian Oscillation and Pacific Decadal Oscillation, and uncertainty about ocean-atmosphere coupling and a possible later La Niña transition.