FPUS71 KLWX 180822 NOWLWX SHORT TERM FORECAST NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 422 AM EDT THU SEP 18 2008 MDZ003-004-501-502-VAZ021-025>031-036>042-050>052-WVZ050>055- 501>504-181130- WASHINGTON-FREDERICK MD-EXTREME WESTERN ALLEGANY- CENTRAL AND EASTERN ALLEGANY-HIGHLAND-AUGUSTA-ROCKINGHAM- SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON-ALBEMARLE- GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN-ORANGE-CULPEPER- PRINCE WILLIAM/MANASSAS/MANASSAS PARK-HAMPSHIRE-MORGAN-BERKELEY- JEFFERSON-PENDLETON-HARDY-WESTERN GRANT-EASTERN GRANT- WESTERN MINERAL-EASTERN MINERAL- 422 AM EDT THU SEP 18 2008 .NOW... PATCHY FOG WILL CONTINUE THROUGH SUNRISE ACROSS THE POTOMAC HIGHLANDS...NORTHERN AND CENTRAL SHENANDOAH VALLEY...CENTRAL MARYLAND...NORTHERN VIRGINIA...AND THE CENTRAL FOOTHILLS. THE FOG MAY BE LOCALLY THICK TOWARD DAWN...ESPECIALLY NEAR RIVER VALLEYS...REDUCING VISIBILITY TO A FEW HUNDRED YARDS. MOTORISTS SHOULD SLOW DOWN AND ANTICIPATE SUDDEN REDUCTIONS IN SIGHT DISTANCE. CONDITIONS WILL RAPIDLY IMPROVE AFTER SUNRISE AROUND 7AM. $$ HTS