FNUS71 KLWX 201157 FWSLWX SPOT FORECAST FOR HEADQUARTER PILE BURN...USDI - NPS NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 757 AM EDT WED MAR 20 2013 FORECAST IS BASED ON IGNITION TIME OF 0900 EDT ON MARCH 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... HIGH PRESSURE OVER THE AREA WITH A STRONG WEST FLOW ABOVE 1000 FT AGL HAS HAS BROUGHT A DRY AND STABLE AIR MASS TO THE BURN AREA THIS MORNING. THESE GUSTY WINDS WILL MIX DOWN TO THE SURFACE TODAY...GUSTS TO 25 MPH ARE POSSIBLE THIS AFTERNOON. WINDS SHIFT TO THE SOUTHWEST BY LATE AFTERNOON WITH INCREASING CLOUDS. LOW PRESSURE CENTER MOVES ACROSS THE REGION TONIGHT. SCATTERED SNOW SHOWERS MAY ACCOMPANY THE LOW. NORTHWEST FLOW WILL PERSIST THROUGH THE END OF THE WEEK WITH BELOW NORMAL TEMPERATURES EXPECTED. HIGH PRESSURE IS EXPECTED TO MOVE INTO THE MID ATLANTIC FRIDAY AND SATURDAY. LOW PRESSURE MAY IMPACT THE REGION SUNDAY. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT). MAX TEMPERATURE.....AROUND 48. MIN HUMIDITY........24 PERCENT. WIND (20 FT)........WEST WINDS 11 TO 15 MPH WITH GUSTS UP TO 25 MPH. CWR.................10 PERCENT. MIXING HEIGHT.......600-1300 FT AGL...INCREASING TO 11400-12100 FT AGL. TRANSPORT WINDS.....WEST 20 TO 29 MPH...INCREASING TO 32 TO 36 MPH LATE IN THE MORNING. TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%)......... 5 13 23 37 47 55 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............30 32 38 43 46 46 RH..............40 49 38 30 25 24 20 FT WIND......W 4 W 10 W 10 W 10 SW 12 SW 12 20 FT WIND GUST.10 15 18 25 25 25 CWR............. 0 0 0 0 10 10 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). SCATTERED SNOW SHOWERS EARLY IN THE EVENING. MIN TEMPERATURE.....AROUND 22. MAX HUMIDITY........88 PERCENT. WIND (20 FT)........NORTHWEST WINDS 7 TO 12 MPH WITH GUSTS UP TO 20 MPH EARLY IN THE EVENING...BECOMING LIGHT AND VARIABLE...THEN BECOMING NORTHWEST 5 TO 6 MPH AFTER MIDNIGHT. CWR.................10 PERCENT...INCREASING TO 30 PERCENT IN THE EVENING. MIXING HEIGHT.......8800-10700 FT AGL...DECREASING TO 5200-6900 FT AGL EARLY IN THE EVENING...THEN DECREASING TO 2800-4500 FT AGL IN THE LATE EVENING AND OVERNIGHT...INCREASING TO 4900 FT AGL LATE. TRANSPORT WINDS.....WEST 22 TO 31 MPH...BECOMING NORTHWEST 15 TO 17 MPH IN THE LATE EVENING AND OVERNIGHT. TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........65 80 93 93 93 84 WEATHER COV..... SCTTRD SCTTRD SCTTRD SCTTRD SCTTRD WEATHER TYPE....NONE SNSHWR SNSHWR SNSHWR SNSHWR SNSHWR TEMP............44 38 34 31 28 27 RH..............27 40 51 61 66 63 20 FT WIND......W 10 NW 5 NW 3 NW 3 NW 5 NW 5 20 FT WIND GUST.20 10 5 10 10 10 CWR.............10 30 30 30 30 30 .THURSDAY... SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). A CHANCE OF FLURRIES. MAX TEMPERATURE.....AROUND 36. MIN HUMIDITY........41 PERCENT. WIND (20 FT)........NORTHWEST WINDS 9 TO 14 MPH. GUSTS UP TO 25 MPH IN THE LATE MORNING AND AFTERNOON. CWR.................10 PERCENT. MIXING HEIGHT.......5400-7000 FT AGL...INCREASING TO 7500-8500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....NORTHWEST 14 TO 22 MPH...INCREASING TO 24 TO 29 MPH EARLY IN THE AFTERNOON. TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM SKY (%).........59 51 54 58 62 62 WEATHER COV.....CHANCE CHANCE CHANCE CHANCE CHANCE CHANCE WEATHER TYPE....SNSHWR SNSHWR SNSHWR SNSHWR SNSHWR SNSHWR TEMP............26 24 29 32 34 35 RH..............62 88 66 56 47 41 20 FT WIND......NW 5 NW 6 NW 8 NW 10 NW 10 NW 11 20 FT WIND GUST.15 15 20 25 25 25 CWR.............10 10 10 10 10 10 $$ FORECASTER...GOLDSTEIN REQUESTED BY...JOHN FRY TYPE OF REQUEST...PRESCRIBED .TAG 20130321.HEADQ.01/LWX