Author: David Drummond

  • Big Tornadoes, Small Towns. Northwood, South Dakota Massive Tornado

    Preliminary damage estimates by the National Weather Service in Grand Forks, North Dakota rate the nearly mile wide tornado that hit Northwood, ND at either a strong EF3 or weak EF4 on the Enhanced Fujita Scale.

     

    Wow. Seems to be turning out to be the year of Small Town/Big Tornado. This is one of several small towns that has been heavily damaged by tornadoes this year. We aren’t talking small ones either, but massive tornadoes. This year has served up what in my memory seems to be the most LARGE tornadoes we have had in a given year. In fact, although I don’t know what the official tornado count is right now, it does seem we have had a healthy number of tornados this year, and I suspect we will end up above average. An average number of confirmed tornadoes in the U.S. every year is about 1000.

    Northwood, South Dakota Damage

    Northwood, South Dakota Damage

    It was interesting to note that the one person killed in this tornado lived in one of the two destroyed mobile home park (where many of the injuries were also). He was taking shelter IN his mobile home when he was killed. How many times must it be said… DO NOT TAKE SHELTER IN YOUR MOBILE HOME FROM TORNADOES!

    Another interesting note, as we always see when people are interviewed after an event like this, someone gets on camera saying how they had NO WARNING. As often is the case however, there in fact WAS advanced warning of this tornado. The storm had SEVERE warnings on it prior to the tornado, and a tornado warning was issued at 8:41 pm stating the radar indicated tornado was 3 miles west or Northwood moving east at 30 mph. According to the Grand Forks Herald, the tornado touched down between 8:50 and 8:52 pm. It isn’t clear by the article if that was the actual tornado formation time, or the time it hit the town, but assuming they are talking about the time it hit the town, that’s a good 10 minutes of advanced warning!

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    BULLETIN - EAS ACTIVATION REQUESTED
    TORNADO WARNING
    NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
    841 PM CDT SUN AUG 26 2007  
    
    THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A  
    
    * TORNADO WARNING FOR...
      SOUTHERN GRAND FORKS COUNTY IN NORTHEAST NORTH DAKOTA...
      THIS INCLUDES THE CITY OF GRAND FORKS...  
    
    * UNTIL 945 PM CDT  
    
    * AT 840 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
      SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES WEST OF
      NORTHWOOD...OR 29 MILES SOUTHWEST OF GRAND FORKS...MOVING TO THE
      EAST AT 30 MPH.  
    
    * THE TORNADO WILL BE NEAR...
      HOLMES AT 910 PM CDT...
      THOMPSON AT 925 PM CDT...
      8 MILES SOUTH OF GRAND FORKS AT 935 PM CDT...  
    
    IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES
    FOR A STURDY BUILDING.
    
  • Dante, South Dakota…What The Hail?

    Huge Hail Dante, South Dakota

    LARGE HAIL AT DANTE SOUTH DAKOTA TUESDAY EVENING

    …DANTE SOUTH DAKOTA HAILSTONE OFFICIALLY MEASURED AT 5.25 INCHES…

    LARGE HAIL FELL ACROSS PORTIONS OF SOUTHEAST SOUTH DAKOTA TUESDAY
    EVENING AUGUST 21 2007. THE SMALL COMMUNITY OF DANTE…IN SOUTHEAST
    CHARLES MIX COUNTY…TOOK A DIRECT HIT FROM THE LARGE HAIL. MOST
    HOMES IN DANTE SUSTAINED CONSIDERABLE HAIL DAMAGE…WITH HOLES
    PUNCHED IN ALMOST EVERY ROOF IN TOWN BY THE LARGE HAIL.

    THE NATIONAL WEATHER SERVICE SURVEYED THE DAMAGE AND FOUND THE
    LARGEST HAILSTONE TO BE 5.25 INCHES IN DIAMETER. THIS HAILSTONE WAS
    NOT PICKED UP FOR 10 TO 20 MINUTES AFTER IT FELL…SO WAS LIKELY
    LARGER WHEN IT HIT THE GROUND. THE LARGE HAIL CREATED CRATERS UP TO
    10 INCHES BY 12 INCHES IN THE YARDS THROUGHOUT DANDE. THE LARGEST
    HAIL FELL AT APPROXIMATELY 610 PM ON AUGUST 21 2007.

    WHILE UNUSUALLY LARGE AND VERY DAMAGING…THE DANTE HAIL DOES NOT
    SET A NATIONAL OR STATE RECORD.

    THE NATIONAL RECORD HAIL IS 7 INCHES ACROSS…MEASURED AT AURORA
    NEBRASKA ON JUNE 22 2003. THE SOUTH DAKOTA RECORD…SINCE
    1950…APPEARS TO BE 6.00 INCHES IN CUSTER COUNTY ON JUNE 22 1968.
    MORE RECENT NOTABLE LARGE HAIL IN SOUTH DAKOTA INCLUDES 4.25 INCHES
    2 MILES SOUTH OF DELMONT IN DOUGLAS COUNTY ON SEPTEMBER 16 2006 AND
    4.25 INCH DIAMETER HAIL IN SULLY COUNTY 8 MILES WEST OF AGAR ON
    AUGUST 24 2006.

    PICTURES OF THE DANTE HAIL AND ASSOCIATED DAMAGE…WILL BE POSTED TO
    THE WFO SIOUX FALLS NEWS HEADLINE WEB PAGE WWW.WEATHER.GOV/FSD BY
    NOON THURSDAY AUGUST 23 2000

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    Unbelievable! I would give a significant and important body part to have been there to get video of that coming down. However, I can only guess that would have been terrifying!! I have personally witnessed cantaloupe size hail, and that was pretty scary, but to imagine hail coming down that would make those kind of craters. I wonder what livestock, if any, was killed around there by that? What is really incredible is when you have to think about the vertical wind speeds in the updraft of that storm capable of suspending hail until it reached that size! What an intense storm!

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    EDIT UPDATE:

    The largest hailstone (pictured below) documented in Dante was officially measured by Dr. Todey at 6 and 7/8 inches in diameter, with a circumference of 18.00 inches and a weight of 1.0 pound, which does set a new record for the state of South Dakota.  The previous South Dakota hailstone record was 6.00 inches in Custer County on June 22 1968.  Records for hail in South Dakota date back to 1950.Nationally, the largest hailstone on record (based on diameter and circumference) occurred at Aurora, Nebraska, on June 22, 2003. The 2003 Aurora hailstone measured 7 inches in diameter, and had a circumference of 18.75 inches.  The Dante hailstone fell just short of this, coming in 1/8 inch shorter, and 3/4 inch smaller in circumference. 

    Dante, South Dakota record hailstone

    Dante, South Dakota record hailstone

    Dante, South Dakota record hailstone