STUDENT IN C152 BECAME DISORIENTED WHEN ENRTE WX DETERIORATES. ATC AND HIS INSTRUCTOR IN ANOTHER ACFT LEAD HIM HOME. THE STUDENT PREFLT BRIEFING BY HIS INSTRUCTOR WAS INCOMPLETE.

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I TURNED A STUDENT LOOSE ON A XCOUNTRY FROM ARB TO ALMA AND BACK. A FRONT WAS SW OF FWA AND SBN. I FELT THAT THE FORECAST FOR FRONTAL PASSAGE AT XD00 WAS PESSIMISTIC. WITH A XA00 AM DEP I THOUGHT THE STUDENT WOULD BE BACK AT XC30 AM. I INCLUDED A DEV TO LANSING IN HIS SIGNOFF IN CASE WX WORSENED. I DID NOT CHK 18000 FT WINDS TO SEE HOW FAST THE FRONT WAS ACTUALLY MOVING. I WAS IN THE RUN-UP AREA WHEN I HEARD THE TWR CALL THE ACFT REPEATEDLY. I INQUIRED AS TO THE PROB. APPARENTLY THE STUDENT WAS LOST AND DISORIENTED. AFTER BEING TURNED OVER TO DETROIT APCH HE DSNDED OUT OF RADIO CONTACT. I TOOK VECTORS TO THE STUDENT'S POS IN HOPES OF VISUAL CONTACT TO LEAD HIM HOME. I WAS VECTORED WITHIN 1 MI OF HIS POS AND NEVER SAW HIM. VISIBILITY WAS 1/2 TO 3/4 OF A MI. BTWN APCH AND I WE TALKED THE STUDENT HOME. 1) I WILL STRESS THE IMPORTANCE OF LNDG WHEN FACING DETERIORATING CONDITIONS. THE STUDENT PASSED 3 ARPTS WHILE BEING FORCED LOWER. 2) I WILL LOOK AT 18000 FT WINDS WHEN TRYING TO GAUGE A FRONT'S SPD. 3) SPEND MORE TIME ON WX THEORY WITH SOLO XCOUNTRY STUDENTS.