Nkọwa: A na-ebu amụma nke oke ifufe tupu oge ọ bụla oke ifufe dị ka Dr. William M. Gray na ndị mmekọ ya na Colorado State University. Oge nkịtị dị ka NOAA si kọwaa nwere ajọ ifufe isii ruo iri na anọ aha nke anọ ruo asatọ ruru oke ifufe na otu ruo atọ ghọrọ nnukwu ifufe.
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