On July 12, 1950, bureau chief Francis W . Reichelderfer officially lifted the agency's ban on public tornado alerts in a Circular Letter, noting to all first order stations that " Weather Bureau employees should avoid statements that can be interpreted as a negation of the Bureau's willingness or ability to make tornado forecasts ", and that a " good probability of verification " exist when issuing such forecasts due to the difficulty in accurately predicting tornadic activity.
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