AN ATX OPERATOR FLIES INTO AN ARPT UNDER IFR FLT PLAN BUT DOES NOT HAVE CURRENT WX.

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ON A 3 LEG EMS (LIFEGUARD) FLT BEGINNING IN CRW TO BLF; PATIENT TO BE PICKED UP IN BLF AND TRANSPORTED TO MGW. I FILED IFR FLT PLAN WITH LIFEGUARD DESIGNATION FOR FIRST AND SECOND LEGS; WHICH SHOULD HAVE BEEN FOR SECOND LEG ONLY. THIRD LEG (TO CRW) LIKE THE FIRST WOULD HAVE BEEN OPERATING UNDER PART 91 WHILE SECOND LEG WOULD BE FAR PART 135. AT THE TIME OF ARR AT BLF AND MGW NO WX OBSERVATIONS WERE BEING TAKEN. WHILE THE WX WAS AS PREVIOUSLY OBSERVED AND FORECAST AS BEING VFR; I REQUESTED A VECTOR TO INTERCEPT LOC AND ACCEPTED CLRNC FOR AN ILS AT BLF APCH (CONTRARY TO 135.225). I DID THIS JUST TO HELP SIMPLIFY THE TRIP; BECAUSE THE WX WAS VERY GOOD AND I COULD HAVE AND SHOULD HAVE FILED A VFR FLT PLAN ONLY; THEREBY NOT BEING LIMITED BY PART 135.225 AND MAYBE OTHER REGS. I DID; HOWEVER; HAVE THE LATEST RPTS WHICH WERE LESS THAN 1 HR OLD; ALONG WITH FORECAST FOR ALL ARPTS INVOLVED. THIS MAY SATISFY LNDG REQUIREMENTS BY HAVING LATEST INFO; BUT I AM NOT SURE AND AM IN PROCESS OF CLARIFICATION.