A low-pressure system located about 625 miles (1005 km) south of Bermuda in the Atlantic Ocean has a 90 percent chance of becoming a subtropical depression or storm in the next 48 hours, the U.S. National Hurricane Center (NHC) said in its latest advisory on Friday. The low is forecast to move northwestward and then northward during the next couple of days, the NHC said. (Reporting by Arpan Varghese in Bangalore Editing by W Simon)
The chance that the low-pressure system won't become a subtropical depression or storm is 10 percent.
Since there's a 90 percent chance that it will become a subtropical depression or storm, the chance that it won't is 10 percent, so the statement is definitely correct. I think the system tripped on the math part of it, maybe.
( z1 chance :ARG1 ( z2 become :polarity - :ARG1 ( z3 system :mod ( z4 pressure :ARG1-of ( z5 low ) ) ) :ARG2 ( z6 or :op ( z7 depression :mod ( z8 tropic ) ) :op ( z9 storm :mod z8 ) ) ) :ARG2 ( z10 percentage-entity :value 10 ) )