SPC Day 1 Categorical Outlook
Issued: 1239Z 04/17/2026
Valid: 1300Z Fri 04/17 - 1200Z Sat 04/18
Map Description: U.S. map showing convective risk levels. An "Enhanced" risk (3, orange) covers a large area from Oklahoma through Missouri, Illinois, and into Michigan. This is surrounded by "Slight" (2, yellow) and "Marginal" (1, dark green) categories. A separate "Marginal" risk area is shown over New England.
SPC Day 1 Hail Outlook
Issued: 1239Z 04/17/2026
Valid: 1300Z Fri 04/17 - 1200Z Sat 04/18
Map Description: U.S. map showing hail probabilities. Two distinct 45% (pink) areas with "Intensity 2" hatching are located over Missouri/Illinois and Wisconsin/Michigan. These are nested within 30% (red), 15% (yellow), and 5% (brown) probability contours extending from north Texas to the Great Lakes.
SPC Day 1 Wind Outlook
Issued: 1239Z 04/17/2026
Valid: 1300Z Fri 04/17 - 1200Z Sat 04/18
Map Description: A map of the U.S. showing wind probabilities. A large corridor of risk extends from Texas northeast into Michigan. A 45% probability (pink) with "Intensity 1" hatching covers much of Missouri, Illinois, and Indiana. A 30% area (red) surrounds it, with lower probabilities (15% yellow, 5% brown) extending further south and north.
SPC Day 1 Tornado Outlook
Issued: 1239Z 04/17/2026
Valid: 1300Z Fri 04/17 - 1200Z Sat 04/18
Map Description: U.S. map showing tornado probabilities. A 15% risk area (red) with "Intensity 2" hatching covers parts of northern Illinois and southern Wisconsin. A 10% area (orange) and 5% area (brown) extend southwest through Missouri and Oklahoma, surrounded by a 2% (green) risk reaching from Texas to the Great Lakes.
NUMEROUS severe thunderstorms are likely this afternoon into tonight.
🚨IMPORTANT: Initially this may be accompanied by a risk for hail that is 2 to 3.5 inches in diameter (on average) and a few strong tornadoes, before severe wind gusts 60 to 90 mph become the most prominent hazard by this evening.