0540 PM TORNADO 3 ENE SOUTHAVEN 34.99N 89.95W
02/05/2008 DESOTO MS TRAINED SPOTTER
ROOF DAMAGE AT FEDEX FIRE STATION AT MEMPHIS
INTERNATIONAL AIRPORT. 73 KT GUST REPORTED BY WIND
My guess on the old scale… strong F3 or weak F4 depending on the location of the windsensor indicated above and location of the firestation in relationship to the 737.
I personally hate the new enhanced scale, as the older scale used the size of “airborne missles” along with what structures the tornado ate in order to determine F scale.
spc.noaa.gov/faq/tornado/f-scale.html is the old scale.