707
FNUS71 KLWX 121821
FWSLWX
SPOT FORECAST FOR POTOMAC RANGER STATION PILES...USFS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
121 PM EST MON JAN 12 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 EST ON JANUARY 14.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
LOW PRESSURE PASSING THROUGH THE GREAT LAKES REGION WILL DRAG A
COLD FRONT INTO THE AREA ON WEDNESDAY. IT'S STILL UNCERTAIN HOW MUCH
PRECIPITATION OCCURS EAST OF THE ALLEGHENY FRONT, THOUGH RECENT
TRENDS ARE DECREASING PRECIPITATION, TO THE POINT WHERE NOT MUCH
MAY OCCUR AT ALL. IF IT DOES, IT WOULD MOST LIKELY BE RAIN BETWEEN
MIDDAY WEDNESDAY THROUGH WEDNESDAY EVENING. IF PRECIPITATION LASTS
INTO THE NIGHT, IT COULD CHANGE OVER TO SNOW. FORECAST RAIN AMOUNTS
ARE LESS THAN ONE TENTH OF AN INCH. WINDS SHOULD BE FAIRLY LIGHT
OUT OF THE SOUTHWEST ON WEDNESDAY, THEN SHIFT TO THE WEST AND
NORTHWEST WEDNESDAY NIGHT AND INCREASE INTO THURSDAY. OTHER THAN
THE POSSIBILITY OF SOME FLURRIES, THE THURSDAY FORECAST IS TRENDING
DRY.
WEDNESDAY
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
RAIN OR SNOW IN THE MORNING, THEN CHANCE OF RAIN
IN THE AFTERNOON.
CWR.................0 PERCENT INCREASING TO 50 PERCENT.
MAX TEMPERATURE.....AROUND 52.
MIN HUMIDITY........61 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 6 MPH.
MIXING HEIGHT.......3900 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 13 TO 22 MPH SHIFTING TO THE WEST 20
TO 25 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (13000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (86400 KNOT-FT) IN THE
AFTERNOON.
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........63 68 73 77 82 85 87 90 90 90 90 88
WEATHER COV..... SCH SCH SCH SCH SCH SCH CHC CHC CHC CHC CHC
WEATHER TYPE.... RS RS RS RN RN RN RN RN RN RN RN
TSTM COV........
CWR.............0 20 20 20 20 20 20 50 50 50 50 50
TEMP............37 37 39 42 45 47 49 50 50 50 49 47
RH..............79 82 79 76 70 68 63 61 61 61 63 68
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW W W W
20 FT WIND SPD..5 5 5 5 5 5 6 6 6 6 6 5
20 FT WIND GUST.10 10 10 12 12 13 13 13 14 14 13 13
MIX HGT (KFT)...1.2 1.3 1.5 1.9 2.4 3.0 3.6 3.9 3.8 3.5 3.0 2.6
TRANSP WIND DIR.SW SW SW SW W W W W W W W W
TRANSP WIND SPD.13 13 13 13 14 18 22 25 25 24 22 20
VRATE KT-FT/1K..13 14 17 21 28 48 68 86 84 73 57 45
VENTRATE CAT....PR PR PR PR PR FR GD GD GD GD FR FR
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). RAIN LIKELY
THROUGH THE NIGHT. CHANCE OF SNOW LATE.
CWR.................60 PERCENT IN THE EVENING, THEN DECREASING
TO 40 PERCENT OVERNIGHT.
MIN TEMPERATURE.....AROUND 21.
MAX HUMIDITY........82 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 5 TO 9 MPH IN
THE LATE EVENING AND OVERNIGHT.
MIXING HEIGHT.......1600 FT AGL.
TRANSPORT WINDS.....WEST 12 TO 21 MPH INCREASING TO 21 TO 30 MPH
LATE IN THE EVENING.
SMOKE DISPERSAL.....EXCELLENT (107900 KNOT-FT) EARLY IN THE EVENING
DECREASING TO FAIR (15800 KNOT-FT) LATE IN THE
NIGHT.
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........87 85 85 85 85 80 75 70 67 64 61 61
WEATHER COV.....CHC LKY LKY LKY LKY LKY LKY CHC CHC CHC CHC CHC
WEATHER TYPE....RN RN RN RN RN RN RN RN RN RN SN SN
TSTM COV........
CWR.............50 60 60 60 60 60 60 40 40 40 40 40
TEMP............45 42 40 39 37 35 34 32 30 28 26 24
RH..............70 76 79 79 82 82 75 75 75 75 74 74
20 FT WIND DIR..W W W W W W W NW NW NW NW NW
20 FT WIND SPD..3 3 3 5 6 6 6 6 7 7 8 9
20 FT WIND GUST.12 10 10 10 12 12 13 14 15 16 17 18
MIX HGT (KFT)...2.2 1.6 1.9 2.4 2.8 2.9 2.9 2.9 3.1 3.5 3.9 4.2
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.17 12 14 17 21 22 21 21 22 25 28 30
VRATE KT-FT/1K..33 16 22 36 51 56 52 52 60 78 94 108
VENTRATE CAT....PR PR PR PR FR FR FR FR FR GD GD VGD
THURSDAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). CHANCE OF SNOW
EARLY IN THE MORNING.
CWR.................40 PERCENT DECREASING TO 10 PERCENT.
MAX TEMPERATURE.....AROUND 29.
MIN HUMIDITY........43 PERCENT.
WIND (20 FT)........WEST WINDS 9 TO 13 MPH WITH GUSTS TO AROUND 25
MPH.
MIXING HEIGHT.......5800 FT AGL.
TRANSPORT WINDS.....WEST 29 TO 31 MPH.
SMOKE DISPERSAL.....EXCELLENT (111900 KNOT-FT).
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........61 50 52 53 55 56 58 59 59 59 59 58
WEATHER COV.....CHC SCH SCH SCH SCH SCH SCH
WEATHER TYPE....SN SN SN SN SN SN SN
TSTM COV........
CWR.............40 20 20 20 20 20 20 10 10 10 10 10
TEMP............23 22 22 23 25 26 27 28 28 28 27 25
RH..............71 71 68 65 57 52 48 44 44 42 44 46
20 FT WIND DIR..W W W NW NW NW W W W W W W
20 FT WIND SPD..9 10 10 10 10 12 12 13 13 13 13 12
20 FT WIND GUST.20 21 21 22 23 23 23 23 24 24 25 24
MIX HGT (KFT)...4.3 4.5 4.7 5.0 5.2 5.4 5.6 5.7 5.8 5.8 5.7 5.3
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.30 31 31 31 31 30 30 29 29 29 29 29
VRATE KT-FT/1K..112 120 127 134 141 141 146 143 145 145 142 134
VENTRATE CAT....VGD VGD VGD VGD VGD VGD VGD VGD VGD VGD VGD VGD
FORECASTER...SNYDER
REQUESTED BY...ROBERT CUMMINGS
TYPE OF REQUEST...PRESCRIBED
.TAG 2528867.0/LWX
.DELDT 01/12/26
.FORMATTERVERSION 2.0.0
.EMAIL ROBERT.CUMMINGS@USDA.GOV
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