317
FNUS71 KLWX 210901
FWSLWX
SPOT FORECAST FOR BLACK LINE NORTH RIVER RX...USFS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
501 AM EDT SAT MAR 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0500 EDT ON MARCH 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
HIGH PRESSURE WILL QUICKLY RETURN WITH CONTINUED ABOVE AVERAGE
TEMPERATURES THIS WEEKEND. HUMIDITY MAY DROP INTO THE 30S IN SOME
LOCATIONS. GUSTY SOUTH WINDS RETURN SUNDAY. A STRONGER COLD FRONT
WILL BRING THE NEXT CHANCE OF SHOWERS SUNDAY NIGHT. HOWEVER,
RAINFALL AMOUNTS LOOK TO BE LIMITED AND SOME AREAS MAY REMAIN DRY.
COOLER WEATHER RETURNS BY EARLY NEXT WEEK AS CANADIAN HIGH PRESSURE
APPROACHES FROM THE WEST. MONDAY WILL FEATURE STRONG NORTHWEST WINDS
AND DROPPING HUMIDITY LEVELS. TUESDAY WILL LIKELY HAVE LOW HUMIDITY
BUT LIGHT WINDS.
REST OF TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........96 PERCENT.
WIND (20 FT)........NORTHWEST WINDS AROUND 8 MPH.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 13 MPH.
SMOKE DISPERSAL.....POOR (2800 KNOT-FT).
TIME (EDT) 5AM
SKY (%).........68
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0
CHC OF THDR (%).0
TEMP............48
RH..............93
20 FT WIND DIR..NW
20 FT WIND SPD..8
20 FT WIND GUST.17
MIX HGT (KFT)...0.3
TRANSP WIND DIR.NW
TRANSP WIND SPD.13
VRATE KT-FT/1K..3
VENTRATE CAT....PR
TODAY
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT) THEN BECOMING
SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 66.
MIN HUMIDITY........38 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH SHIFTING TO THE
SOUTHWEST 5 TO 6 MPH IN THE AFTERNOON.
MIXING HEIGHT.......5600 FT AGL.
TRANSPORT WINDS.....NORTH 5 TO 12 MPH SHIFTING TO THE SOUTHWEST 5
TO 14 MPH LATE IN THE AFTERNOON, THEN
INCREASING TO AROUND 16 MPH LATE IN THE
AFTERNOON.
SMOKE DISPERSAL.....POOR (2000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (78100 KNOT-FT) IN THE
AFTERNOON.
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........70 52 24 18 12 10
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0
TEMP............47 45 52 60 64 66
RH..............93 96 77 53 41 38
20 FT WIND......NW 8 NW 6 NW 5 W 5 S 5 SW 6
20 FT WIND GUST.17 14 12 12 12 14
MIX HGT (FT)....200 300 900 2300 4200 5400
TRANSPORT WIND..NW 12 N 9 N 7 NW 5 SW 8 W 14
VRATE KT-FT/1K..2 2 6 9 29 65
VENTRATE CAT....POOR POOR POOR POOR POOR GOOD
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
CWR.................10 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 47.
MAX HUMIDITY........86 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 7 MPH.
MIXING HEIGHT.......200 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 16 MPH.
SMOKE DISPERSAL.....GOOD (49600 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (1100 KNOT-FT) LATE IN THE
NIGHT.
TIME (EDT) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........11 8 27 30
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0
CHC OF THDR (%).0 0 0 0
TEMP............64 53 49 48
RH..............41 64 74 80
20 FT WIND......SW 6G14 SW 5G13 SW 6G14 SW 7G16
MIX HGT (FT)....3800 200 200 200
TRANSPORT WIND..SW 15 SW 8 SW 10 W 14
VRATE KT-FT/1K..50 1 2 2
VENTRATE CAT....FAIR POOR POOR POOR
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
MAX TEMPERATURE.....AROUND 77.
MIN HUMIDITY........40 PERCENT.
WIND (20 FT)........WEST WINDS 8 TO 14 MPH. GUSTS UP TO 26 MPH
EARLY IN THE MORNING.
MIXING HEIGHT.......6200 FT AGL.
TRANSPORT WINDS.....WEST 15 TO 22 MPH INCREASING TO 25 TO 31 MPH
LATE IN THE MORNING.
SMOKE DISPERSAL.....POOR (2700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (93400 KNOT-FT) IN THE
AFTERNOON INCREASING TO EXCELLENT (120500
KNOT-FT) LATE IN THE AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........37 41 31 38 43 48 48 47 47 42 36 31
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............49 49 51 56 61 66 70 73 75 76 77 76
RH..............83 86 83 74 67 61 55 48 45 43 40 42
20 FT WIND DIR..W W W W W W W W W W SW SW
20 FT WIND SPD..8 8 9 9 9 10 12 13 14 14 13 13
20 FT WIND GUST.18 18 21 22 23 25 26 26 26 26 26 26
MIX HGT (KFT)...0.2 0.2 0.2 0.4 1.0 1.7 2.6 3.9 5.0 5.8 6.2 5.7
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.15 17 17 20 22 25 26 28 28 30 31 30
VRATE KT-FT/1K..3 3 3 7 20 36 61 93 121 152 166 149
VENTRATE CAT....PR PR PR PR PR PR GD GD VGD EXL EXL VGD
FORECASTER...BELAK
REQUESTED BY...AARON STROBEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2606947.0/LWX
.DELDT 03/21/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.COLLETT@USDA.GOV,AARON.P.STROBEL@USDA.GOV,TED.DOCEV@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page