HELI EMS PLT ENCOUNTERS WX. MUST DIVERT AGAIN TO HOSPITAL SITE.

Narrative

; I DEPARTED A HOSPITAL CITY D; ABOUT X:58 FOR A PR VISIT TO CITY C. DUAT WX BRIEF INDICATED FLT COULD BE CONDUCTED VFR FREE OF ICE. DEPARTED THE PR SITE ABOUT Y:58 AND ARRIVED AT ARPT F FOR FUEL AT Z:22. WHILE STARTING FOR DEP WAS CONTACTED BY MY DISPATCHER ASKING IF I COULD DIVERT TO CITY E FOR A PATIENT PICKUP. AFTER REVIEWING THE COPY OF DUAT I HAD IN THE COCKPIT; I ELECTED THAT I COULD COMPLETE THE FLT. I DEPARTED CITY E AT W:24 FOR AN APPROX 35 MIN FLT TO HOSPITAL A. 15 NM NNE OF HOSPITAL A; I SAW VISIBILITY DECREASING TO MY FRONT AND I BEGUN TO PICKUP VERY LI RAIN. I HAD MONITORED ARPT G ATIS THROUGHOUT THE FLT. THEY RPTED 19 OVC 10 PLUS. SOON AFTER I ENCOUNTERED THE RAIN; I ENCOUNTERED (UNFORECAST) FREEZING RAIN THAT BEGAN TO OBSCURE THE WINDSCREEN. I IMMEDIATELY DIVERTED TOWARDS ARPT G. HALFWAY THERE; TWR RPTED THE VISIBILITY WAS DECREASING WITH FALLING RAIN. I THEN DIVERTED TO THE B HOSPITAL ABOUT 4 MINS AWAY. PATIENT WAS ADMITTED TO B HOSPITAL. ARRANGEMENT THAT WERE MADE FOR GND TRANSPORT OF THE PATIENT WERE NOT UTILIZED. WX FORECAST FOR X:00 LCL AT ZZZ WAS 15 OVCST 0714G24 OCN/8 OVCST 2R-1P-S-F. YES; THE CONDITIONS ARRIVED EARLY AND I SHOULD HAVE UPDATED MY WX BRIEF. LESSON WELL LEARNED!