Bombogenesis & 2010 Statistics

The lowest inland (non-tropical) barometric pressure in the United States was recorded today in Big Fork, MN at 2213Z. The recorded pressure was 28.20" or 954.96mb! This potent system laid down a serial derecho that stretched from MI all the way to AL. Along the way, the SPC issued numerous Tornado watches including one PDS Tornado watch due to the incredible amount of shear in the atmosphere. 0-1km helicity values pegged around 900 m^2/s^2 and while not much CAPE was present, the wind shear was enough to produce many small spin-ups embedded in the line. Further south into AL, discrete cells formed out ahead of the line increasing the tornado threat across Dixie Alley as they played with the ample amounts of helicity. The SPC also had an area outlined as a High risk, which is the first high risk since May 19, 2010. Lower Michigan was also included in the High risk for a little while, which makes it the first High risk for Lower Michigan in 9 years, and the first High risk in MI in 3 years. This event was also rare in the fact that it was only the third time in history that the SPC has issued a High risk in the month of October. While I'm on the statistics train, I might as well throw in a few more interesting statistics so far from the 2010 season.

UPDATE: A FEW OF THE RECORDS HAVE BEEN RECALCULATED TO ADJUST FOR TRUE MEAN SEA LEVEL PRESSURE, AND STANDS AT 955.2MB. SEE MORE HERE: Official NWS statement on the pressure record

UPDATE AGAIN: AFTER READING SOME OF THE ARTICLES POSTED BY THE NUMEROUS WFO'S, THEY BELIEVE THIS PRESSURE WAS NOT THE LOWEST INLAND (NON-TROPICAL) BAROMETRIC PRESSURE EVER RECORDED.

- Michigan only had 3 tornadoes in 2009.
- So far in 2010, MI has had 30 tornadoes!
- Minnesota is ranked #1 for the most tornadoes this year with 145.
- Top tornado day was June 17, 2010 with a total of 115 tornado reports.
- June was the top month for tornadoes in 2010.
- So far, there have been a total of 12 EF4's, and 0 EF5's.
- The first ever Tornado watch (#694 with 60/30 probs.) was issued for Utah (October 6th).
- Vivian, SD set the new world record for the largest hailstone. This stone came in at 8" in diameter, 18.625" in circumference, and weighed 1.9375 lbs!
- 2010 is also the first year I have been stuck on a dirt road with two tornadoes (one at ~50-75 yards) surrounding the vehicle (5/22/2010).
- I have also set many new records myself including mileage, tornado count, wind speed, hail, states chased, and number of chases (data can be found on the right).