PVT PLT OF AN SEL SMA DURING VFR XCOUNTRY FLT BECAME TRAPPED UNDERNEATH AN OVCST AND FLEW INTO CLOUDS. PLT TURNED AROUND AND CLBED TO ON TOP OVCST WHEREIN HE REQUESTED AN IFR CLRNC FROM APCH CTL. APCH CTLR REFERRED HIM TO CTR WHO IDENTED HIM AS LOCATED IN CLASS B AIRSPACE. HE WAS GIVEN AN IFR CLRNC TO CONTINUE HIS FLT.

Narrative

VFR FLT PLAN ONA-JUX. XA30 LCL; ONA DIRECT FOW. TSTMS FROM LINE TO DSM; TSTMS STARTING AT RWF. PER FLT WATCH (MINNEAPOLIS). CLOSED RTE OFF FROM MKT TO OTG CAUSING DEV FROM FOW TO DWN TO ILQ DIRECT FSD. AT FOW; TURNED DIRECT DWN 2500 FT VFR AT BELLE PLAINE; MN; FLEW INTO CLOUD DECK IMC. TURNED 180 DEGS AND CLBING TO FILE IFR CLRNC WITH ZMP. CTR WAS TOO BUSY; SO FILED FLT PLAN WITH PRINCETON FSS. BACK TO CTR AND WAS TOLD TO CONTACT MSP APCH CTL. OPENED IFR FLT PLAN CLBING L TURN DIRECT DWN TO 6000 FT. SWITCHED BY MSP APCH TO CTR AT THIS TIME. INFORMED OF CLASS B INTRUSION. TRACKED VFR FROM FARMINGTON VOR PAST FCM TO 19 MI W OF MSP. ENDED FLT AT FSD AND CALLED MSP TWR FOR MORE INFO PER THEIR INSTRUCTIONS. MAIN CONTRIBUTING FACTOR TO INTRUSION WAS A SW WIND 30 KTS; LACK OF SITUATIONAL AWARENESS OF ACFT WITH RELEVANCE TO WIND VELOCITY AND DIRECTION. AT ALL TIMES ACFT WAS VFR OR VFR ON TOP -- NO FLT IN IMC CONDITIONS; EVEN THOUGH UNDER IMC CLRNC. IN MY OPINION; ALL DECISIONS MADE ENRTE WERE CORRECT. SITUATIONAL AWARENESS OF LOCATION OF ACFT TO NAVAIDS IS CAUSE OF PROB.