Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0237 AM CDT Thu Sep 23 2021 Valid 261200Z - 011200Z ...DISCUSSION... General model trends in the 4-8 period have been for a blocking upper pattern to evolve. Low-level moisture will remain very limited day 4 (Sunday). By later day 5, a slow-moving southern-stream cutoff upper low may reach the southern High Plains with Gulf moisture returning to TX by day 6. However, winds aloft and vertical shear accompanying the closed upper low will remain relatively weak. While predictability decreases by days 7-8, some models (including the ECMWF) suggest an Omega block will persist in some form across the U.S., which will result in limited severe potential. Read more LIVE: spc.noaa.gov
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