Welcome to meteorological autumn.
September 1st marks the beginning of the fall season, meteorologically speaking. The months of September, October and November best represent fall for meteorological record keeping purposes.
As for meteorological summer 2010, it will be a record summer to remember in many ways. Frequent severe weather outbreaks highlight the sumemr of 2010.
-Minnesota's 145 tornado reports this year leads the nation. This is the first time on record that Minnesota has led the nation in reported tornadoes.
Keep in mind that many of these are still preliminary reports, and the final numbers may drop by as much as a third, but so will other state totals. Here are the top 7 states to date.
1) Minnesota 145
2) Texas 87
3) Kansas 80
4) Oklahoma 70
5) North Dakota 68
6) Colorado 66
7) Wisconsin 60
Texas and Oklahoma have the best chance at closing the tornado numbers with their typical fall severe weather season, but Minnesota's lead is significant at this point.
-The June 17th tornado outbreak smashed the record for the number of tornadoes in a single day in Minnesota. A total of 48 tornadoes skipped across Minnesota that day. That's nearly double previous record of 27 set on June 16th, 1992.
-A total of 4 EF4 tornadoes blasted Minnesota in 2010 including the devastating June 17th Wadena EF4 twister. They are the strongest tornadoes to hit the state in a decade.
Summer 2010 was significantly warmer than average in Minnesota. Here are some stats for MSP.
-It was the 5th warmest on record for the Twin Cities. (+3.2 degrees)
-It was the 3rd warmest August on record for the Twin Cities. (+6.4 degrees)
-We've suffered through 17 days at or above 90 degrees in the metro this year. The average is 13 days.
Summer 2010 was also wet in many locations in Minnesota, especially in the south. The Twin Cities summer rainfall total of 14.19" is only about 1.5" above average, but other communities recorded record amounts of rain this summer.
-This was the wettest summer on record for La Crosse with 20.93" and Wabasha with 24.59" recorded.
One reason for all the rainfall was the unusually high atmospheric moisture content over Minnesota this summer.
The average dew point for the Twin Cities is 61 degrees since June 1st. That's about 5 degrees above average. That's why it's felt so humid this summer, and the extra moisture has helped fuel storms.
The warm wet summer has a positive side. Minnesota will produce record crop yields this year. The severe weather is scattered enough that crop damage was minimal over the state as a whole.
Many of us will remember the summer of 2010 for a long time to come!
Posted at 5:28 PM on September 1, 2010
by Paul Huttner
Filed under: Hurricanes
They're battening down the hatches on the Outer Banks.
The NHC upgraded Hurricane Earl back to a Category 4 monster hurricane on the Saffir Simpson Hurricane Intensity Scale late Wednesday. Earl's track has also been shifting slightly west with each passing day, and the "official" track for Earl now brings the eye just off North Carolina's Outer Banks in the wee hours of Friday morning.
The wind field with Earl is large enough that hurricane force winds are now likely on the Outer Banks. Any westward shift of the track could bring Earl's potentially devastating eyewall ashore. Here's the discussion form NHC.
SATELLITE AND RECONNAISSANCE AIRCRAFT FIXES INDICATE THAT EARL
HAS BEEN MOVING RELENTLESSLY TOWARD THE NORTHWEST OR 310 DEGREES
AT 15 KNOTS. THE HURRICANE IS ABOUT TO REACH THE WESTERN EDGE OF
THE SUBTROPICAL RIDGE AND SHOULD BEGIN TO TURN MORE TO THE
NORTH-NORTHWEST AND NORTH LATER TONIGHT AND THURSDAY. IN ABOUT 36
HOURS OR SO...THE HURRICANE WILL ENCOUNTER THE BASE OF THE
MID-LATITUDE WESTERLIES AND SHOULD BEGIN TO RECURVE OR TURN TO THE
NORTHEAST WITH AN INCREASING FORWARD SPEED. THIS IS THE SOLUTION
CONSISTENTLY PROVIDED BY TRACK MODELS...WHICH HAVE EARL PASSING TO
THE EAST BUT NOT FAR FROM THE OUTER BANKS OF NORTH CAROLINA ON
THURSDAY NIGHT. ONLY A SMALL WESTWARD DEVIATION OF THE TRACK TO THE
WEST WOULD BRING THE CORE OF THE HURRICANE TO THE COAST.
GIVEN THE FORECAST TRACK...THE LARGE SIZE OF THE WIND FIELD...AND
THE EXPECTED INCREASE IN FORWARD SPEED WATCHES AND WARNINGS HAVE
BEEN EXTENDED NORTHWARD ALONG THE EAST COAST OF THE UNITED STATES.
Stay tuned as Earl takes aim at the Outer Banks and possibly the New England this week.
You'll notice a nip of September in the air by Friday.
An approaching cold front will kick off another bout of showers and T-Storms overnight into early Thursday. Behind the front, the season's coldest air pushes in.
Temperatures will not climb out of the 60s in most of Minnesota Friday.
Cold fronts gain strength as we move into September for one main reason. Shorter daylight and longer nights allow more radiational cooling at night. That means air masses coming out of Canada have had more time to cool off compared to June and July. We've lost over 2 hours and 15 minutes of daylight since June 21st in the metro. The longer nights mean progressively more potent cold fronts as we move deeper into September and October.