Page:CAB Accident Report, American Airlines Flight 20.pdf/32

 Weather Bureau Airway Forecast - 5:30 p.m. to 1:30 a.m. (EST)

DeependingDeepening [sic] low near Effingham at 13:30 E (1:30 p.m. EST) will move to northeastern Indiana by close of period (i.e. 1:30 a.m.) with cold front south Effingham moving rapidly eastward over southern Indiana and northern Kentucky sections of district and the occluded front moving over southern Lake Michigan and into northwestern Indiana. Warm front just south of Effingham-Louisville line at 13:30 E. Will advance to near Fort Wayne-Cincinnati line by close of period. Overcast with light intermittent rain through Indiana, southwestern Ohio and southwestern lower Michigan with ceilings between 3000 and 6000 lowering to between 400 and 800 with approach of cold front over western Indiana and Kentucky second half period and rain changing to snow following front. Broken to overcast high to intermediate clouds elsewhere to westward of mountains with clouds gradually thickening and lowering over northern Ohio and western Lake Erie sections. Through mountains and eastward scattered to broken high clouds except increasing to high overcast extreme western Pennsylvania and western Maryland second half period. Visibility between 3 and 5 in rain and lowering to less than one in snow. Visibility otherwise between 4 and 8. Icing clouds vicinity of cold front and severe icing in both clouds and precipitation vicinity of occluded and cold fronts. Winds aloft about 270 degrees 20 to 35 m.p.h. mountain eastward and 150 and 180 degrees 20 to 35 m.p.h. westward of mountains and shifting to 330 degrees 30 to 45 m.p.h. westward of cold and occluded fronts.