687  
FNUS71 KLWX 221202  
FWSLWX  
 
SPOT FORECAST FOR RAPPAHANNOCK NWR...USFWS  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
702 AM EST FRI JAN 22 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 0000 EST ON JANUARY 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
 
A COLD FRONT WILL PASS THROUGH THE REGION TODAY, BUT DRY  
CONDITIONS WILL PERSIST. CANADIAN HIGH PRESSURE WILL APPROACH THE  
AREA FRIDAY NIGHT THROUGH SATURDAY. BLUSTERY AND COLD CONDITIONS  
ARE EXPECTED AHEAD OF THE HIGH. WINDS WILL DIMINISH SATURDAY NIGHT  
AND SUNDAY AS THE HIGH BUILDS OVERHEAD, BUT IT WILL REMAIN  
CHILLY. LOW PRESSURE MAY BRING WINTRY PRECIPITATION TO THE AREA  
EARLY NEXT WEEK.  
   
TODAY
 
 
SKY/WEATHER.........SUNNY (20-30 PERCENT).  
CWR.................0 PERCENT.  
MAX TEMPERATURE.....AROUND 55.  
MIN HUMIDITY........31 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 5 TO 9 MPH WITH  
GUSTS TO AROUND 20 MPH IN THE LATE MORNING.  
 
MIXING HEIGHT.......6300 FT AGL.  
TRANSPORT WINDS.....WEST 7 TO 16 MPH SHIFTING TO THE NORTHWEST 18  
TO 22 MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR (500 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO EXCELLENT (63400 KNOT-FT) IN THE  
AFTERNOON INCREASING TO GOOD (54900 KNOT-FT)  
EARLY IN THE MORNING INCREASING TO EXCELLENT  
(112600 KNOT-FT) IN THE AFTERNOON IN THE  
AFTERNOON.  
 
TIME (EST) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........18 14 13 27 29 20  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
CWR.............0 0 0 0 0 0  
TEMP............36 39 44 49 55 50  
RH..............72 64 55 42 31 36  
20 FT WIND......SW 3 W 4 W 6 W 8 W 9 NW 8  
20 FT WIND GUST.8 10 14 18 20 18  
MIX HGT (FT)....100 100 900 4500 6300 4900  
MIXNG WIND......SW 7 SW 7 W 9 W 16 W 21 W 21  
VRATE KT-FT/10001 1 8 63 113 88  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).  
CWR.................0 PERCENT.  
MIN TEMPERATURE.....AROUND 26.  
MAX HUMIDITY........65 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 7 MPH.  
MIXING HEIGHT.......100 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 12 TO 20 MPH INCREASING TO 21 TO 22  
MPH AFTER 3 AM.  
SMOKE DISPERSAL.....EXCELLENT (78800 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (800 KNOT-FT) LATE IN THE  
NIGHT.  
 
TIME (EST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........14 12 14 15 16 15  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
CWR.............0 0 0 0 0 0  
TEMP............42 37 34 31 30 28  
RH..............46 54 58 63 63 63  
20 FT WIND......NW 7 NW 6 N 6 NW 6 NW 6 NW 6  
20 FT WIND GUST.14 11 12 13 12 10  
MIX HGT (FT)....1800 100 400 300 2000 4100  
MIXNG WIND......NW 15 NW 12 NW 12 NW 12 NW 16 NW 22  
VRATE KT-FT/100023 1 4 3 28 79  
   
SATURDAY
 
 
SKY/WEATHER.........SUNNY (5-15 PERCENT).  
CWR.................0 PERCENT.  
MAX TEMPERATURE.....AROUND 40.  
MIN HUMIDITY........32 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 11 MPH. GUSTS UP TO 28 MPH  
EARLY IN THE MORNING.  
MIXING HEIGHT.......4900 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 16 TO 24 MPH.  
SMOKE DISPERSAL.....FAIR (13900 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO EXCELLENT (97000 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (EST) 6 AM 9 AM NOON 3 PM  
SKY (%).........14 12 10 8  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE  
CWR.............0 0 0 0  
TEMP............27 31 36 39  
RH..............60 51 38 32  
20 FT WIND......NW 5G10 NW 8G19 NW 11G22 NW 10G20  
MIX HGT (FT)....1900 3300 4800 4300  
MIXNG WIND......NW 18 NW 22 NW 22 NW 20  
VRATE KT-FT/100030 62 91 74  
 

 
FORECASTER...SOUZA  
REQUESTED BY...GENE NAWROT  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2101010.1/LWX  
.DELDT 01/22/21  
.FORMATTERVERSION 1.0.26  
 
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