ROBINSON PLT ENCOUNTERS SEVERE UPDRAFTS AND TURB AND IS UNABLE TO MAINTAIN ASSIGNED ALT.

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AS I PREPARED FOR THE INST TRAINING FLT I CHKED THE WX ON THE INTERNET AND CONCLUDED THAT IT WAS SAFE FOR THE FLT TO OCCUR IN VMC. HIGH WINDS WERE RPTED ALL DAY SO I CALLED WX-BRIEF AND REQUESTED A STANDARD WX BRIEFING FOR THE RTE OF SEE-SDM-MYF-SEE 'ROUND ROBIN.' AIRMET WAS STILL IN EFFECT FOR THE SOUTHERN CALIFORNIA AREA AND I WAS PROVIDED THE METARS FOR THE NAMED ARPTS. WIND ALOFT WAS 30 KTS AT 3000 FT; BUT BELIEVED TO BE CONSTANT AND GUST WERE NOT RPTED FOR MY RTE. I NOTED BEING TOLD THAT NO PIREPS WERE RPTED FOR THE AREA. THE FSS AND I AGREED THAT IT WOULD BE WINDY AND BUMPY; BUT NOTHING TO BE CONCERNED ABOUT. I FILED A VFR FLT PLAN KNOWING THAT HALF OF THE FLT WOULD NOT BE IFR OPS. I STARTED THE ACFT; TOOK OFF OUT OF SEE AND OPENED MY FLT PLAN WITH SAN DIEGO RADIO ON 122.4. I AGAIN WAS TOLD THERE WERE NO PIREPS AFFECTING MY RTE OF FLT. I THEN CONTACTED SOCAL APCH CTL (124.35) AND PICKED UP AN IFR CLRNC FOR PRACTICE APCHS; RECEIVED A SQUAWK CODE AND VECTORS TO FINAL. THE CTLR ISSUED THE TYPICAL MODIFIED MISSED APCH INSTRUCTIONS (TURN NE OVER PGY TO REMAIN CLR OF SAN CLASS B). WE FLEW THE APCH; EXECUTED THE MISSED APCH AS INSTRUCTED AND CONTACTED SOCAL ON 124.35. I WAS GIVEN A VECTOR TO HEAD 060 DEGS AND CLB TO 3000 FT. I REQUESTED A DIFFERENT HDG AND WAS DENIED. AS WE STARTED CLBING WE NOTED LIGHT TO MODERATE CHOP AND WE WERE HEADED INTO THE WIND. AT APPROX 2500 FT THE HELI BEGAN TO CLB EXCEEDING THE SET CLB PWR CONFIGNS. WE CONFIRMED THAT WE WERE IN AN UPDRAFT BY LOWERING THE PWR TO DSCNT CONFIGN AND THE HELI CONTINUED TO CLB. I ADVISED SOCAL THAT WE WERE IN AN UPDRAFT AND UNABLE TO STOP CLBING AT 3000 FT. WE WERE CLRED TO 3500 FT AND DESPITE THE CLRNC WE WERE STILL UNABLE TO STOP THE CLB. WE THEN WERE CLRED TO 4000 FT ONLY TO KEEP CLBING PAST 4000 FT. WE AGAIN ADVISED THE CTLR AND HE CLRED US TO 4500 FT AND NOT ABOVE. HE THEN TURNED US TO A HDG OF 360 DEGS AND INFORMED A B757 ON FINAL TO SAN THAT HE IS RESTR TO 5000 FT AND NO LOWER DUE TO A HELI AT 12 O'CLOCK POS; THAT COULD NOT MAINTAIN ALT. AS WE CONTINUED TO CLB AT 500 FPM WE PASSED RIGHT THROUGH 4500 FT AND THE AIRLINER WAS DIVERTED S OF MY POS (S OF THE APCH COURSE) AS WE CLBED UP INTO THE SAN LOC APCH PATH. AT APPROX 5000 FT I WAS ABLE TO GET THE HELI TO DSND AND WE CANCELED FURTHER IFR REQUEST AND WERE CLRED DIRECT SEE WITH A CLASS B CLRNC. IT TOOK US 20 MINS TO GET THE HELI FROM 5000 FT TO 1500 FT OVER SEE. SOCAL REQUESTED ME TO FILE A PIREP ONCE CLR OF HIS AIRSPACE. I CONTACTED SAN DIEGO RADIO TO FILE THE PIREP AND THEY INFORMED ME THAT A PIREP WAS RECEIVED JUST AFTER I OPENED MY FLT PLAN BY A B757 FROM JLI VORTAC TO THE FAF OF SAN FOR MODERATE TURB. I FILE THE PIREP AND CLOSED MY FLT PLAN. WE RETURNED TO SEE AND SUSPENDED ALL FLT OPS FOR THE REST OF THE NIGHT.