Sky Mail
October, 2019 Storm -
Classic Case of Bombogenesis
Last week on Wednesday and Thursday (October 16-17), a very potent storm developed and moved across New England - far outstripping Melissa, a subtropical storm the previous weekend. Over 500,000 customers were left without power, wind gusts reached 90 mph at Provincetown, 89 mph at Wellfleet, 88 mph at Fairhaven, and 128 mph on Mount Washington.

At Blue Hill Observatory many monthly records were smashed. Here are some of them:

* The storm underwent rapid intensification with barometric pressure falling 43.2 mb in 24 hours (bombogenesis is defined as a pressure drop of
24 mb in 24 hours). This broke the October record that was set way back in October, 1925!

* BHO also experienced its largest October one hour pressure change of 7.1 mb.

* At Blue Hill Observatory the sea level minimum pressure was 28.82 inches of mercury at 0335 EST - this set the all time record low pressure for any October in our 134 year record.

* Although the peek wind gust was only 61 mph, it was still a daily record surpassing the previous set in October, 1964.

Other all time October low pressure records were set at:

Providence RI- 976.3 mb
Boston MA- 975.3 mb; Wind gust to 70 mph
Concord NH- 973.1 mb (28.73 inches) Rainfall 2.29 inches

(Satellite image above from NOAA)

To view a loop of the storm see:
Blue Hill Record
With the longest climate record in North America, breaking a record at Blue Hill Observatory speaks to the remarkable nature of this storm and the need to continue the meticulous climate record at BHO
Charles Orloff, Executive Director corloff@bluehill.org
508-776-1879

Don McCasland, Program Director
617-696-0562