Day 3 Convective Outlook

Issued: 2026-09-27 07:23 UTC  ·  Valid: 2026-09-29 12:00 – 2026-09-30 12:00 UTC

Summary

Scattered thunderstorms are expected across much of the Southwest and isolated storms may occur from the central Rockies toward the upper Mississippi Valley on Tuesday. No severe thunderstorms are forecast for the continental United States during this period.

Product Text

000 ACUS03 KWNS 270723 SWODY3 SPC AC 270722 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0222 AM CDT Sun Sep 27 2026 Valid 291200Z - 301200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... No severe thunderstorms are forecast across the U.S. on Tuesday and Tuesday night. ...DISCUSSION... At mid-levels on Tuesday, zonal westerly flow will be in place over the northwestern U.S. with a trough in the northern Plains. An upper-level low will move across the Desert Southwest. In the vicinity of this system, scattered thunderstorms will develop during the day over much of the Southwest. More isolated storms will be possible from the central Rockies northeastward into the upper Mississippi Valley. Instability is expected to remain relatively weak, and no severe threat is forecast across the continental U.S. Tuesday and Tuesday night. ..Broyles.. 09/27/2026 $$