950
FNUS71 KLWX 041823
FWSLWX
SPOT FORECAST FOR SNOW OPS (PREP) - NATIONAL CAPITAL PARKS EAST...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
123 PM EST THU DEC 4 2025
FORECAST IS BASED ON FORECAST START TIME OF 1400 EST ON DECEMBER 04.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
AN AREA OF LOW PRESSURE WILL SLIDE BY TO THE SOUTH INTO FRIDAY
MORNING AND THROUGHOUT THE DAY ON FRIDAY. PRECIPITATION IS
EXPECTED TO ARRIVE BETWEEN 5 AM AND 7 AM, BUT THERE IS A SLIGHT
CHANCE FOR SOME LIGHT SNOW IN THE COUPLE HOUR PRIOR TO THAT. THE
EVENT WILL THEN BE MOSTLY, IF NOT ALL, SNOW FOR THE DURATION UNTIL
THE END TIME AROUND NOON ON FRIDAY. THERE IS A SMALL CHANCE OF SOME
FREEZING DRIZZLE ON THE BACK END AS THE PRECIPITATION LIGHTENS UP
THROUGH 5 PM OR SO, BUT HAVE THAT CHANCE AROUND 10 TO 20 PERCENT
AT THIS TIME.
OVERALL, LOOKING AT EXPECTED SNOW ACCUMULATIONS OF UP TO AN INCH.
HOWEVER, IF THE SYSTEM CONTINUES TO TREND NORTH, A REASONABLE WORST
CASE SCENARIO WOULD BE FOR AROUND 2 TO 3 INCHES.
LIGHT WINDS AND BECOMING COLD FRIDAY NIGHT, WITH LOW TEMPERATURES
DROPPING INTO THE MID 20S.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
SNOW AFTER 3 AM, BECOMING LIKELY BY 5 AM.
CHANCE OF PCPN......60 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 21.
MAX HUMIDITY........84 PERCENT.
SURFACE WINDS (MPH).NORTH WINDS 5 TO 10 MPH WITH GUSTS TO AROUND 20
MPH IN THE EVENING BECOMING LIGHT.
TIME (EST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........28 40 41 49 59 77 79 84 87 88 89 89
WEATHER COV..... SCH CHC LKY
WEATHER TYPE.... SN SN SN
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 10 10 10 20 40 60
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............32 30 27 26 26 25 26 25 24 24 24 23
RH..............63 69 74 71 68 71 68 68 68 65 68 74
SURFACE WND DIR.NW NW NW N N N N N N NE NE E
SURFACE WND SPD.9 8 8 7 6 5 5 3 3 2 2 2
SURFACE WND GST.20 17 14 13 12 12 9 9 8 7 7 6
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SNOW LIKELY IN
THE MORNING. SLIGHT CHANCE OF LIGHT FREEZING
DRIZZLE AND SNOW BETWEEN NOON AND 5 PM.
CHANCE OF PCPN......75 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 33.
MIN HUMIDITY........60 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTHEAST AROUND 5 MPH
LATE IN THE MORNING, THEN BECOMING LIGHT LATE
IN THE AFTERNOON.
TIME (EST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........87 90 83 90 92 90 89 88 92 94 86 78
WEATHER COV.....LKY LKY LKY CHC CHC SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE....SN SN SN SN SN FZD FZD FZD FZD FZD FZD FZD
TSTM COV........
CHC OF PCPN (%).70 75 65 40 30 20 20 20 20 10 10 10
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............23 22 23 25 27 28 30 31 31 33 32 32
RH..............77 84 84 88 85 81 78 78 81 78 81 85
SURFACE WND DIR.E E E SE SE SE SE SE SE SE SE SE
SURFACE WND SPD.2 2 2 2 3 5 5 5 3 3 3 2
SURFACE WND GST.6 7 7 7 8 8 9 9 8 7 7 6
FORECASTER...LEDBETTER
REQUESTED BY...ELLIS, RUHI
TYPE OF REQUEST...OTHER
.TAG 2527050.0/LWX
.DELDT 12/04/25
.FORMATTERVERSION 2.0.0
.EMAIL RUHI_ELLIS@NPS.GOV
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