Figure 18: U.S. Low-Level Significant Weather Prognostic Charts

1 2 0 W 9 0 W 8 0 W 3 0 N 7 0 W 4 0 N CA NV OR WA ID UT MT WY CO NM TX LA AR MO IA MN WI IL MS AL TN KY IN MI OH KY PA MD DE NJ NY CT RI MA ME VT NH SC NC VA GA FL OK KS NE SD ND AZ V T 0 6 Z F r i M a r 1 7 2 0 1 7 1 2 H R S I G W X P R O G LO W LV L S F C - 4 0 0 M B 1 2 0 W 9 0 W 8 0 W 3 0 N 7 0 W 4 0 N CA NV OR WA ID UT MT WY CO NM TX LA AR MO IA MN WI IL MS AL TN KY IN MI OH KY PA MD DE NJ NY CT RI MA ME VT NH SC NC VA GA FL OK KS NE SD ND AZ V T 1 8 Z F r i M a r 1 7 2 0 1 7 2 4 H R S I G W X P R O G LO W LV L S F C - 4 0 0 M B P G B E 9 9 K W B C 0 4 0 0 4 0 0 4 0 0 8 0 0 8 0 0 8 0 0 8 0 1 2 0 1 2 0 1 2 0 1 8 0 / 1 0 0 1 4 0 / 1 2 0 1 2 0 1 2 0 0 8 0 0 8 0 / 0 8 0 0 4 0 0 4 0 0 4 0 1 2 0 0 6 0 / Freezing level above mean sea level Freezing level at surface TStorms imply possible svr or greater turb. svr icing and LLWS. Flight planning only. See TAFs for specific terminal forecast. Ceiling less than 1,000 feet and/or visibility less than 3 miles Ceiling 1,000-3,000 feet inclusive and/or visibility 3-5 miles incl. Moderate or greater turbulence