


Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
180 ACUS48 KWNS 150653 SWOD48 SPC AC 150652 Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0152 AM CDT Tue Jul 15 2025 Valid 181200Z - 231200Z ...DISCUSSION... Low-amplitude/zonal westerly mid/upper flow is forecast across the northern U.S. for much of the Day 4-8 period. At the same time, the subtropical upper ridge/high over the Southeast will spread westward, with larger-scale upper ridging developing over the central U.S. late in the forecast period. Seasonally moist and unstable conditions will exist for much of the CONUS east of the Rockies. This will lead to daily thunderstorm activity, particularly for parts of the northern/central Plains to the Midwest and Mid-Atlantic regions. These areas will generally be on the north side of the subtropic high and the southern fringes of any stronger westerly flow near the international border. However, a lack of any stronger forcing for ascent or notable surface features precludes severe probabilities. ..Leitman.. 07/15/2025