409  
FNUS71 KLWX 231044  
FWSLWX  
 
SPOT FORECAST FOR CAR FREE EVENT...NPS  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
644 AM EDT SUN APR 23 2017  
 
FORECAST IS BASED ON INCIDENT TIME OF 0600 EDT ON APRIL 23.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
A COLD FRONT WILL STALL TO OUR SOUTH TODAY. LOW PRESSURE WILL  
SLOWLY TRACK ALONG THE BOUNDARY TODAY AND TOWARDS THE MID-  
ATLANTIC COAST EARLY NEXT WEEK. COOL AND UNSETTLED CONDITIONS ARE  
EXPECTED DURING THIS TIME. RAIN WILL SLOWLY SPREAD NORTHWARD BEGINNING  
THIS AFTERNOON ACROSS THE SOUTHERN PORTIONS OF THE PARK, AND REACHING  
THE NORTHERN END OF THE PARK LATE THIS EVENING. A SOAKING RAIN IS EXPECTED  
TONIGHT THROUGH TUESDAY. RAINFALL TOTALS FROM 1 TO 2 INCHES ARE EXPECTED,  
WITH LOCALIZED AMOUNTS REACHING 3 INCHES POSSIBLE.  
 
THE LOW WILL FINALLY MOVE AWAY FROM THE AREA WEDNESDAY AND WARMER  
CONDITIONS WILL RETURN FOR THURSDAY AND FRIDAY.  
   
TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY (65-75 PERCENT)...THEN BECOMING  
CLOUDY (85-95 PERCENT). PATCHY FOG EARLY IN THE  
MORNING. A SLIGHT CHANCE OF RAIN EARLY IN THE  
AFTERNOON. A CHANCE OF RAIN LATE.  
MAX TEMPERATURE.....AROUND 55.  
MIN HUMIDITY........54 PERCENT.  
SURFACE WINDS.......EAST WINDS 5 TO 7 MPH.  
 
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........63 51 58 64 82 89  
WEATHER COV.....PATCHY S CHC S CHC  
WEATHER TYPE....FOG NONE NONE NONE RAIN RAIN  
TEMP............42 42 44 49 52 55  
RH..............86 79 76 66 59 55  
SURFACE WIND....N 7 N 6 N 6 NE 6 NE 5 E 6  
SURFACE WND GST.15 15 10 10 10 10  
   
TONIGHT
 
 
SKY/WEATHER.........CLOUDY (95-100 PERCENT). A CHANCE OF RAIN EARLY  
IN THE EVENING...THEN RAIN.  
MIN TEMPERATURE.....AROUND 43.  
MAX HUMIDITY........93 PERCENT.  
SURFACE WINDS.......NORTHEAST WINDS 5 TO 6 MPH.  
 
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........96 95 99 100 100 100  
WEATHER COV.....CHANCE LIKELY LIKELY DEFNTE DEFNTE DEFNTE  
WEATHER TYPE....RAIN RAIN RAIN RAIN RAIN RAIN  
TEMP............53 50 48 46 45 44  
RH..............59 68 74 83 89 89  
SURFACE WIND....E 5 E 5 E 5 E 5 NE 6 NE 6  
SURFACE WND GST.10 10 10 10 10 10  
   
MONDAY
 
 
SKY/WEATHER.........CLOUDY (95-100 PERCENT). RAIN.  
MAX TEMPERATURE.....AROUND 50.  
MIN HUMIDITY........83 PERCENT.  
SURFACE WINDS.......NORTHEAST WINDS 7 TO 9 MPH.  
 
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........100 100 100 100 99 100  
WEATHER COV.....DEFNTE DEFNTE DEFNTE DEFNTE DEFNTE DEFNTE  
WEATHER TYPE....RAIN RAIN RAIN RAIN RAIN RAIN  
TEMP............43 45 47 48 49 50  
RH..............93 89 86 86 86 83  
SURFACE WIND....NE 7 NE 8 NE 9 NE 9 NE 9 NE 9  
SURFACE WND GST.15 15 20 20 20 15  
 

 
FORECASTER...MUCCILLI  
REQUESTED BY...MATT WAY  
TYPE OF REQUEST...OTHER  
.TAG 1707535.0/LWX  
 
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