289
FNUS71 KLWX 220858
FWSLWX
SPOT FORECAST FOR BLACK LINE NORTH RIVER...USFS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
458 AM EDT SUN MAR 22 2026
FORECAST IS BASED ON IGNITION TIME OF 0500 EDT ON MARCH 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
MILD TODAY WITH SOUTHERLY FLOW BRINGING HIGH TEMPS IN THE 80S FOR
MOST. THE SOUTHERLY FLOW WILL RESULT IN MOISTURE ADVECTION, SO NO
RELATIVE HUMIDITY CONCERNS TODAY. A STRONG COLD FRONT WILL PASS
THROUGH THIS EVENING INTO TONIGHT BRINGING SHOWERS AND
THUNDERSTORMS. AREAS WITH THE GREATEST LIKELIHOOD TO SEE A WETTING
RAIN ARE ALONG AND NORTH OF US-50 TOWARDS THE MASON-DIXON.
EXPECT GUSTY NORTHWEST WINDS MONDAY BEHIND A STRONG COLD FRONT.
GUSTS OF 20 TO 25 MPH CAN BE EXPECTED ON THE VALLEY FLOOR WITH 30 TO
35 MPH (LOCALLY HIGHER) ALONG THE RIDGES. SKIES WILL TREND PARTLY TO
MOSTLY CLOUDY TO START BEFORE BECOMING MOSTLY SUNNY IN THE AFTERNOON
WITH HIGHS IN THE LOW 60S. MINIMUM RELATIVE HUMIDITY VALUES WILL
FALL INTO THE 25 TO 30 PERCENT RANGE WITHIN A WELL MIXED ENVIRONMENT.
COOLER (NEAR NORMAL) TEMPERATURES WILL RETURN TUESDAY INTO
WEDNESDAY. HIGH PRESSURE SHIFTING OFFSHORE WILL RESULT IN SOUTHERLY
RETURN FLOW BY LATE TUESDAY AFTERNOON. AFTER A COUPLE OF DRY DAYS,
RELATIVE HUMIDITY WILL FALL TO 35 TO 40 PERCENT EACH AFTERNOON, WITH
OVERNIGHT RECOVERIES AROUND 70 PERCENT TUESDAY NIGHT/EARLY WEDNESDAY
MORNING. THE CHANCE FOR WETTING RAINS IS VERY LOW - LESS THAN 10
PERCENT. WIND GUSTS COULD APPROACH 20 MPH WEDNESDAY AFTERNOON.
REST OF TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........77 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 6 MPH.
MIXING HEIGHT.......200 FT AGL.
TRANSPORT WINDS.....WEST AROUND 14 MPH.
SMOKE DISPERSAL.....POOR (2300 KNOT-FT).
TIME (EDT) 5 AM
SKY (%).........24
WEATHER COV.....
WEATHER TYPE....NONE
TSTM COV........
CWR.............0
CHC OF THDR (%).0
TEMP............48
RH..............77
20 FT WIND......W 6
20 FT WIND GUST.15
MIX HGT (FT)....200
TRANSPORT WIND..W 14
VRATE KT-FT/1K..2
VENTRATE CAT....POOR
TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 77.
MIN HUMIDITY........37 PERCENT.
WIND (20 FT)........WEST WINDS 7 TO 13 MPH. GUSTS UP TO 25 MPH IN
THE LATE MORNING AND AFTERNOON.
MIXING HEIGHT.......5200 FT AGL.
TRANSPORT WINDS.....WEST 14 TO 22 MPH INCREASING TO 24 TO 26 MPH
LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (2300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (84900 KNOT-FT) IN THE
AFTERNOON INCREASING TO EXCELLENT (105100
KNOT-FT) LATE IN THE AFTERNOON.
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........31 33 36 47 42 44
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............49 50 62 71 76 77
RH..............77 68 54 44 37 39
20 FT WIND......W 7 W 8 W 9 W 10 W 13 W 13
20 FT WIND GUST.16 17 21 22 24 24
MIX HGT (FT)....200 200 700 2300 4500 5200
TRANSPORT WIND..W 14 W 15 W 18 W 21 W 22 W 26
VRATE KT-FT/1K..2 3 12 42 85 119
VENTRATE CAT....POOR POOR POOR FAIR GOOD VYGD
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT). RAIN SHOWERS
LIKELY AND SLIGHT CHANCE OF THUNDERSTORMS
OVERNIGHT.
CWR.................0 PERCENT INCREASING TO 20 PERCENT OVERNIGHT,
THEN INCREASING TO 30 PERCENT OVERNIGHT
INCREASING TO 40 PERCENT OVERNIGHT INCREASING
TO 60 PERCENT DECREASING TO 40 PERCENT EARLY IN
THE MORNING.
CHANCE OF THUNDER...20 PERCENT.
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........WEST WINDS 12 TO 13 MPH SHIFTING TO THE
NORTHWEST OVERNIGHT. GUSTS UP TO 25 MPH. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
OVERNIGHT.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....WEST 20 TO 26 MPH SHIFTING TO THE NORTHWEST 14
TO 18 MPH AFTER 3 AM.
SMOKE DISPERSAL.....EXCELLENT (84100 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (4800 KNOT-FT) LATE IN THE
NIGHT.
TIME (EDT) 6 PM 9 PM MIDNGT 3 AM
SKY (%).........37 38 56 79
WEATHER COV..... S CHC CHANCE
WEATHER TYPE....NONE NONE RNSHWR RNSHWR
TSTM COV........ S CHC
CWR.............0 0 20 40
CHC OF THDR (%).0 0 10 20
TEMP............74 65 62 58
RH..............43 58 67 83
20 FT WIND......W 13G24 W 13G22 W 12G24 NW 13G24
MIX HGT (FT)....3700 400 400 400
TRANSPORT WIND..W 26 W 18 W 20 W 18
VRATE KT-FT/1K..84 6 8 7
VENTRATE CAT....GOOD POOR POOR POOR
MONDAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT) THEN BECOMING
SUNNY (5-15 PERCENT). SLIGHT CHANCE OF RAIN
SHOWERS EARLY IN THE MORNING.
CWR.................20 PERCENT DECREASING TO 10 PERCENT EARLY IN
THE MORNING.
CHANCE OF THUNDER...5 PERCENT.
MAX TEMPERATURE.....AROUND 52.
MIN HUMIDITY........45 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 12 TO 16 MPH WITH GUSTS TO
AROUND 32 MPH.
MIXING HEIGHT.......3800 FT AGL.
TRANSPORT WINDS.....NORTHWEST 14 TO 23 MPH INCREASING TO 26 TO 28
MPH EARLY IN THE AFTERNOON, THEN DECREASING TO
18 TO 21 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (7100 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (64400 KNOT-FT) IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........79 75 69 63 53 42 31 19 9 7 6 4
WEATHER COV.....SCH SCH
WEATHER TYPE....RW RW
TSTM COV........
CWR.............20 20 10 10 10 10 10 10 0 0 0 0
CHC OF THDR (%).10 10 0 0 0 0 0 0 0 0 0 0
TEMP............51 51 49 48 47 48 48 49 49 49 48 47
RH..............100 96 96 89 83 71 63 54 48 46 46 45
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..12 13 14 15 15 16 16 16 16 15 15 15
20 FT WIND GUST.24 26 26 29 30 32 31 31 30 30 29 29
MIX HGT (KFT)...0.5 0.7 0.9 1.4 1.7 2.2 2.2 2.7 3.4 3.7 3.8 3.6
TRANSP WIND DIR.NW NW NW NW NW NW NW NW NW NW NW NW
TRANSP WIND SPD.15 14 15 21 23 16 28 26 18 18 20 21
VRATE KT-FT/1K..7 9 12 25 33 31 53 62 54 59 64 64
VENTRATE CAT....PR PR PR PR PR PR FR GD FR FR GD GD
FORECASTER...BELAK
REQUESTED BY...AARON STROBEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2607006.1/LWX
.DELDT 03/22/26
.FORMATTERVERSION 2.0.0
.EMAIL AARON.P.STROBEL@USDA.GOV,TED.DOCEV@USDA.GOV,JAMES.COLTEN@USDA.GOV,COLTEN.MOOR@USDA.GOV
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