Midwest Monster

250 mb Wind Anomalies in Recent Strong La Nina Autumns

It’s not uncommon during La Nina autumns to see massive storms spin up in the Midwest, Lakes, and Plains, thanks in part to a raging strong jet stream coming out of the Pacific Ocean. If you click the map to the left, you can see a composite of the anomaly of 250 mb wind speeds (basically how much stronger or weaker than normal the jet stream winds are) in some recent stronger La Nina autumns, similar to this one. So it’s pretty obvious that this is somewhat normal. What isn’t normal is how much of a beast this storm is.

Yesterday we talked about this storm “bombing” out, which it appears to have done by definition (at least a 24 mb drop in 24 hours). It is now to the point where both state records for lowest barometric pressure have been set in Minnesota and Wisconsin. The previous record in Minnesota was set during a similar fall storm in November of 1998. According to the National Weather Service in Duluth, Aitkin, MN dropped to a barometric pressure of 962.3 mb or 28.42″Hg. The previous state record was 962.6 mb at Albert Lea, MN during that November 10, 1998 storm. In Wisconsin, Superior hit 28.38″Hg or 961.06mb. The previous record there was 963.43 mb in Green Bay in April of 1982.

As of this writing, both Orr and Bigfork, Minnesota are sitting at 28.24″Hg or 956.32mb. If this is verified (and it will likely go even lower in some other parts of Northeast Minnesota), this would break the all-time United States low pressure record for a non-tropical cyclone. The old record of 28.28″Hg was set in Cleveland, OH during the Blizzard of 1978 (and naturally, the Wikipedia article is already up to date with this information!).

Edit to add: 28.22″ as of 3:30 Central time, or 955.6 mb…both at Orr and Bigfork.

National Radar Composite from Late Tuesday, image from NCAR.

So this is truly an historic storm…and one that is not just setting records, it’s causing mayhem! Blizzard Warnings for the Dakotas, literally dozens of tornado warnings in the Midwest and Southeast, numerous tornado watches (5 currently from Mississippi to Southwest NY), widespread wind damage, and quite a change in the weather overall. We had a somewhat rare “High Risk” for severe weather issued this morning by the Storm Prediction Center. So far, there have only been 11 reports of tornadoes, however there have been over 150 reports of strong winds or wind damage thus far, and that number is only going to continue going up.

I’ll try and recap some of the damage reports and more tomorrow.

Hitting the Links

Paul Douglas blogs about the storm in Minnesota for the StarTribune.

The CIMMS Satellite Blog, as always, does a bang up job (and will likely add more in the coming days) with some imagery from this storm.

Sadly (from a weather junky’s standpoint), the Weather Channel appears to be headed down the road of the rest of cable TV…just when it seemed they were getting back on track. Unfortunately, this is what drives ratings, so they will continue to follow the blueprint until it fails.

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