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The tropical hurricane which was reported moving slowly northeastward over the South Atlantic was considered by the weather experts as being too far removed at any time during the period under consideration to be an influencing factor. The above analysis was based entirely upon a synoptic weather map with upper air directions and velocities and available radiosonde data superimposed.
Weather Forecast
The following is the airway forecast issued by the Cleveland station of the U.S. Weather Bureau for the period 11:30 A.M. to 7:30 P.M. (EST), for the route Detroit to Washington:
"Weak low pressure central over eastern Lake Superior and northern Lake Michigan with poorly defined and weak cold front near Indianapolis, Grand Rapids, and north westward at 7:30 A.M. Pressure gradient is very flat throughout this district. Cloudiness will increase to broken or overcast to westward of mountains with ceiling 4 to 7000 and lower clouds 2 to 4000 variable scattered to broken first quarter and broken to overcast thereafter. Scattered showers in afternoon and some mild thunderstorms probable central Michigan, eastern Indiana and western Ohio second half period. Overcast to occasionally broken clouds mountains eastward with fog diminishing and ceiling lifting to 6 or 800 over higher terrain and 1 to 2000 ground scattered showers through mountains and some mild thunderstorms likely in afternoon. Local areas of very low to low visibility with fog slowly dissipating over middle and eastern ridges
