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34 mb drop!

09 Dec 2009 06:43 AM
An epic winter storm has most of Iowa shut down this Wednesday morning with snowfall amounts approaching a foot and a half in areas. The big story now is the blowing snow thanks to strong winds blowing over 30 mph sustained. These winds are due to a tremendous pressure gradient over the state. The featured image shows the pressure drop yesterday for the Des Moines ASOS at 34 millibar in a 24 hour period. This rapid change, perhaps unprecedented, in pressure will help keep winds strong today and roads in Iowa impassable.

Voting:
Good: 86
Bad: 8

Tags:   blizzard   bomb   pressure  

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Des Moines Airport Altimeter

Bombogenesis

18 Oct 2007 08:37 AM
When you get old like me, your bones and joints become the best predictor of the weather. The development of powerful storm system yesterday and today has dropped our surface pressure by around 0.7 inches of mercury (~ 24 millibars) in just over 24 hours. This is close to the "bombogenesis" criteria (24 mb in 24 hrs), which is just a cool sounding term to describe another cool sounding term, rapid cyclogenesis.

Voting:
Good: 12
Bad: 6

Tags:   bomb   pressure