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  • 1 day ago
Supercells are already developing early this afternoon, according to Dr. Reed Timmer, who is reporting from Dubuque, Iowa, on April 17. The Upper Midwest is at risk of tornado-producing storms.
Transcript
00:00We have sunny skies here in the northeast corner of Iowa.
00:03You can feel the moist underneath dry profile up here.
00:06That's contributing to extreme instability in northeast Iowa and to southern Wisconsin, even northern Illinois.
00:13That's where the threat of EF2 and stronger tornadoes is greatest right on the nose of this system.
00:19There is a surface low that's going to move across north central Iowa,
00:21and there's already some storms starting to fire just ahead of that surface low out there.
00:25So I do expect a tornado watch to come shortly.
00:28The supercells up here are going to fire a little bit earlier.
00:31They're going to develop as early as 1 p.m., and in fact, they're already starting to develop in north
00:35central Iowa,
00:36and there is a threat of all hazards here.
00:38As we mentioned, large hail, damaging straight-line winds, and EF2 and stronger tornadoes.
00:43And in between, down further south in Missouri into western Illinois,
00:47a damaging straight-line wind event is most likely further south into Oklahoma.
00:52It looks like damaging wind and large hail will be the main threat,
00:55but a conditional threat of a strong tornado exists down there with that southern mode as well
00:59as the low-level jet ramps up, but that depends on supercells developing ahead of the cold front,
01:04maybe even on the dry line that extends south through western Oklahoma.
01:08But we are in the Dominator 3, full-blown tornado intercept mode today.
01:12Very important to stay tuned to those severe weather watches and warnings from Oklahoma all the way up to Wisconsin.
01:17That's the Red River up to Lake Superior today.
01:20A very large-scale severe weather outbreak is about to begin.
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