170 AIR MASS ANALYSIS 
ieee 
| 
7:30 p.m. May 6 1938 
L-LOW H-HIGH 
' co = 
ai ma Sa / SO 01S nea) 
Surface Cold Front 
ee Cold Front 
i geile | aaa Surfaces erm Froat. 
aot oo Se DOO Upper far Front aa 
ee Ey ee ee PO ee 
Fic. 4. SURFACE Map For 7.30 P.M. (E. S. T.) May 6, 1988. 
