SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1245 AM CDT Fri Oct 29 2021 Valid 291200Z - 301200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PATS OF EASTERN NORTH CAROLINA AND THE MID-ATLANTIC... ...SUMMARY... Isolated strong to severe storms may occur today over parts of coastal North Carolina into the Mid-Atlantic. Marginally severe wind gusts will be the primary threat. ...Eastern North Carolina/Mid-Atlantic... An upper-level low will move eastward across the Tennessee Valley today as southwest mid-level flow remains in place over much of the Eastern Seaboard. At the surface, a warm front will move north-northeastward from eastern North Carolina this morning to Maryland this afternoon. A narrow corridor of maximized low-level moisture will be located near the warm front with surface dewpoints in the lower to mid 60s F extending about 100 statute miles inland. Thunderstorm development will be possible near the front during the day as surface temperatures warm. Although instability will remain weak, RAP forecast soundings along the Mid-Atlantic Coast have 0-6 km shear in the 70 to 80 knot range this afternoon. In addition, 0-3 km storm relative helicity is forecast to be near 300 m2/s2. This suggests that a marginal tornado threat could develop with rotating cells that interact with the front. An isolated wind-damage threat may develop, but any severe threat should remain very localized. ..Broyles/Bentley.. 10/29/2021 Read more LIVE: spc.noaa.gov
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