AN ACR FLC FLYING A BA31 NEAR JFK EXPERIENCES EXTREME WX RESULTING IN THE PIC BECOMING TEMPORARILY INCAPACITATED.

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ACFT X; A BRITISH AEROSPACE JETSTREAM 31; WAS OPERATING AS FLT XXX FAR PART 121 SCHEDULED PAX OPS IAD TO JFK. ON CLBOUT FROM IAD PASSING BAL AT 9000 FT MSL; CREW ENCOUNTERED MODERATE TO SEVERE TURB. TURB PERSISTED UNTIL ABOUT 25 NM SE OF JFK. FORECAST CALLED FOR IMC; RAIN; LIGHT TO MODERATE TURB WITH CHANCE OF SEVERE TURB TO BE EXPECTED N OF ADVANCING HURRICANE. STORM CELLS WERE EASILY AVOIDED WITH INFLT RADAR; YET THERE WAS NO RELIEF FROM TURB. DURING THE FLT; MANY (OVER 50%) PAX EXPERIENCED AIRSICKNESS. CREW DISCUSSED RETURNING TO IAD DUE TO EXTREME PAX DISCOMFORT; YET ELECTED TO CONTINUE TO JFK AS FORECAST CALLED FOR IMPROVING CONDITIONS FURTHER N TOWARDS JFK AND WORSENING CONDITIONS AT IAD. 20 MINS PRIOR TO LNDG; CAPT EXPERIENCED AIRSICKNESS. AFTER VOMITING INTO COCKPIT MAP CASE; THE CAPT CLEANED UP AND AN UNEVENTFUL DSCNT; APCH AND LNDG IN IMC (200+ FT; 1/2 MI VISIBILITY; WIND 060 DEGS 15 KTS; GUSTING TO 25 KTS) WAS MADE BY FO ON JFK RWY 4R. AFTER LNDG; CAPT CALLED COMPANY DISPATCH TO BE RELIEVED OF DUTIES FOR A FEW HRS TO ENSURE AIRSICKNESS SYMPTOMS HAD PASSED. THE PERIOD OF INCAPACITATION WAS 3-5 MINS IN LEVEL CRUISE FLT. 2 HRS AFTER LNDG AT JFK THE COMPANY SUSPENDED FLT OPS DUE TO VIOLENT WX ENCOUNTERED BY CREWS AS A RESULT OF RAPIDLY ADVANCING HURRICANE. THIS CREW MEMBER FEELS FORECASTERS WERE SURPRISED BY THE HURRICANE'S RAPID ACCELERATION UP THE NE COAST OF THE UNITED STATES AND THEREFORE SEVERE WX ARRIVED 4-8 HRS IN ADVANCE OF ORIGINAL PREDICTIONS. CREW MEMBER ALSO FEELS DISPATCHERS WERE UNDERSTAFFED AND OVERWHELMED BY STORM AND WERE UNABLE TO PASS CRITICAL INFO TO FLCS IN A TIMELY MANNER. NOT A SINGLE MESSAGE WAS RECEIVED BY CREW FROM COMPANY DISPATCH ON ACARS. THIS FLT PROBABLY SHOULD HAVE NEVER LEFT IAD IN THE FIRST PLACE.