120
FNUS71 KLWX 171946
FWSLWX
SPOT FORECAST FOR OTTO RX...NPS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
346 PM EDT TUE MAR 17 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON MARCH 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
IN THE WAKE OF A STRONG FRONTAL SYSTEM, COLD AND BLUSTERY
CONDITIONS ARE EXPECTED WITH SNOW SHOWERS ALONG THE ALLEGHENY
MOUNTAINS. HIGH PRESSURE WILL BUILD TOWARD THE MID- ATLANTIC
WEDNESDAY AND REMAIN NEARBY THROUGH FRIDAY. TEMPERATURES GRADUALLY
REBOUND LATE IN THE WORKWEEK, WITH THE WARMEST CONDITIONS LIKELY
THIS WEEKEND. A COLD FRONT SWEEPS THROUGH ON SUNDAY BRINGING A FEW
SHOWERS TO THE AREA. COOLER WEATHER RETURNS BY EARLY NEXT WEEK.
MINIMUM RELATIVE HUMIDITY VALUES WILL FALL INTO THE 25 TO 35 PERCENT
RANGE THIS AFTERNOON OUTSIDE THE MOUNTAINS. THESE VALUES RECOVER
BACK INTO THE 50 TO 60 PERCENT RANGE TONIGHT AS WEST AND NORTHWEST
WINDS LIGHTEN. MINIMUM RELATIVE HUMIDITY VALUES OF 25 TO 35 PERCENT
ARE EXPECTED WEDNESDAY AFTERNOON WITH 30 TO 45 PERCENT VALUES
THURSDAY AFTERNOON.
WETTING RAIN CHANCES WILL BE LIMITED THROUGH THE WEEKEND AREAWIDE.
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 41.
MIN HUMIDITY........33 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH IN THE
AFTERNOON.
MIXING HEIGHT.......5600 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 2 MPH SHIFTING TO THE SOUTH 2
TO 8 MPH LATE IN THE MORNING, THEN INCREASING
TO 12 TO 16 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (6000 KNOT-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (78600 KNOT-FT) IN THE
AFTERNOON.
TIME (EDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........44 43 44 36 25 26 29 25
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0
TEMP............30 33 35 37 39 40 40 41
RH..............44 39 36 35 34 34 36 33
20 FT WIND DIR..SW S S S S S S S
20 FT WIND SPD..2 2 3 5 6 6 7 8
20 FT WIND GUST.6 7 8 10 12 12 13 13
MIX HGT (KFT)...3.0 3.8 4.4 4.9 5.3 5.6 5.6 5.5
TRANSP WIND DIR.NW SW S S S S S S
TRANSP WIND SPD.2 2 6 8 12 15 16 16
VRATE KT-FT/1K..6 8 22 34 54 72 79 77
VENTRATE CAT....PR PR PR PR FR GD GD GD
WEDNESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (45-55 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 28.
MAX HUMIDITY........72 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 7 MPH IN THE EVENING AND
OVERNIGHT BECOMING LIGHT.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....SOUTH 10 TO 16 MPH.
SMOKE DISPERSAL.....GOOD (57100 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (5500 KNOT-FT) LATE IN THE
NIGHT.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........24 27 28 36 36 36 43 50 57 54 50 47
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............40 39 36 34 33 33 32 31 30 30 29 29
RH..............36 40 45 49 51 53 56 61 63 63 69 69
20 FT WIND DIR..S S SE SE SE SE SE S S S SE SE
20 FT WIND SPD..7 6 6 6 6 6 5 5 5 5 3 3
20 FT WIND GUST.13 12 12 12 12 12 12 12 10 10 9 9
MIX HGT (KFT)...4.1 0.7 0.5 0.5 0.5 0.5 0.5 0.6 0.7 0.7 0.7 0.7
TRANSP WIND DIR.S S S S S S S S S S S S
TRANSP WIND SPD.16 13 13 13 14 14 13 13 12 10 10 10
VRATE KT-FT/1K..57 7 6 6 6 6 6 7 7 6 6 6
VENTRATE CAT....FR PR PR PR PR PR PR PR PR PR PR PR
THURSDAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT).
CWR.................10 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 53.
MIN HUMIDITY........46 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 7 MPH IN THE
LATE MORNING AND AFTERNOON.
MIXING HEIGHT.......3600 FT AGL.
TRANSPORT WINDS.....SOUTH 8 TO 14 MPH.
SMOKE DISPERSAL.....POOR (4400 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (42700 KNOT-FT) IN THE
AFTERNOON.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........49 52 54 55 57 58 63 68 73 75 76 78
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 10 10 10 10
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............28 29 30 33 37 41 45 48 51 52 53 53
RH..............71 72 72 66 59 55 51 49 46 46 46 46
20 FT WIND DIR..SE SE SE SE S S S S S S S S
20 FT WIND SPD..3 3 3 5 5 6 6 7 7 7 7 7
20 FT WIND GUST.9 8 8 9 9 10 12 12 13 13 13 12
MIX HGT (KFT)...0.6 0.5 0.6 0.8 1.1 1.6 2.1 2.7 3.1 3.5 3.6 3.3
TRANSP WIND DIR.S S S S S S S S S S S S
TRANSP WIND SPD.10 9 9 8 8 8 9 10 12 13 14 14
VRATE KT-FT/1K..5 4 5 6 8 11 17 24 31 38 43 40
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR FR PR
FORECASTER...WITT
REQUESTED BY...CULBRETH
TYPE OF REQUEST...PRESCRIBED
.TAG 2606120.0/LWX
.DELDT 03/17/26
.FORMATTERVERSION 2.0.0
.EMAIL TIMOTHY_CULBRETH@NPS.GOV
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