National Weather Service Issues Heat Advisory Until 7PM. MDZ004>006-503>507-VAZ036>040-050-051-056-501-502-505-506-202245- /O.EXA.KLWX.HT.Y.0004.170720T1600Z-170720T2300Z/ Frederick MD-Carroll-Northern Baltimore-Northwest Montgomery- Central and Southeast Montgomery-Northwest Howard- Central and Southeast Howard-Northwest Harford-Nelson-Albemarle- Greene-Madison-Rappahannock-Orange-Culpeper-Spotsylvania- Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun- Including the cities of Frederick, Ballenger Creek, Eldersburg, Westminster, Reisterstown, Cockeysville, Germantown, Damascus, Bethesda, Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City, Jarrettsville, Lovingston, Charlottesville, Stanardsville, Madison, Washington, Orange, Gordonsville, Culpeper, Fredericksburg, Warrenton, Turnbull, Purcellville, Leesburg, Ashburn, and Sterling 1039 AM EDT Thu Jul 20 2017 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM EDT THIS EVENING... Sterling, Va. (NWS) The National Weather Service in Baltimore MD/Washington has issued a Heat Advisory, which is in effect until 7 PM EDT this evening. * HEAT INDEX VALUES...Up to 105 due to temperatures in the mid 90s, and dewpoints in the upper 60s. * IMPACTS...The heat and humidity may cause heat stress during outdoor exertion or extended exposure. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Heat Advisory means that a period of high temperatures is expected. The combination of high temperatures and high humidity will create a situation in which heat illnesses are possible. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency-call 911. By the National Weather Service