517
FNUS71 KLWX 211441
FWSLWX
SPOT FORECAST FOR MS2A, 2CS...DEP
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1041 AM EDT FRI SEP 21 2018
FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON SEPTEMBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
HIGH PRESSURE WILL SHIFT OFFSHORE TODAY AHEAD OF AN APPROACHING
COLD FRONT. THE FRONT WILL CROSS INTO THE REGION FROM THE
NORTHWEST TONIGHT, PUSH SOUTHWARD ON SATURDAY, AND STALL NEAR THE
REGION THROUGH MONDAY. THIS WILL BEING COOL, WET WEATHER TO THE
AREA SUNDAY AND MONDAY. THE FRONT WILL RETURN NORTHWARD NEXT WEEK
BRINGING ADDITIONAL UNSETTLED WEATHER.
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) THEN BECOMING
PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING
MOSTLY CLOUDY (60-70 PERCENT). SCATTERED
THUNDERSTORMS LATE IN THE EVENING. SCATTERED
SHOWERS LATE IN THE EVENING, THEN ISOLATED
SHOWERS EARLY IN THE MORNING.
CWR.................10 PERCENT INCREASING TO 30 PERCENT LATE IN THE
EVENING, THEN INCREASING TO 50 PERCENT
OVERNIGHT DECREASING TO 20 PERCENT EARLY IN THE
MORNING.
MIN TEMPERATURE.....AROUND 65.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 10 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
EVENING.
MIXING HEIGHT.......100-1100 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 12 TO 20 MPH SHIFTING TO THE WEST 7
TO 8 MPH AFTER 3 AM.
SMOKE DISPERSAL.....POOR TO FAIR (9300-17600 KNOT-FT) DECREASING TO
POOR (1000 KNOT-FT) EARLY IN THE EVENING.
TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........66 49 51 55 65 76
WEATHER COV..... SCTTRD SCTTRD SCTTRD
WEATHER TYPE....NONE NONE NONE RNSHWR RNSHWR RNSHWR
CWR.............10 10 10 30 50 50
TEMP............73 70 69 68 67 67
RH..............84 93 97 100 100 100
20 FT WIND......S 10 S 10 S 9 S 8 SW 6 W 5
20 FT WIND GUST.20 18 17 15 12 9
MIX HGT (FT)....1100 300 200 200 300 100
MIXNG WIND......S 20 S 14 S 14 S 14 SW 14 W 8
VRATE KT-FT/100018 4 2 3 3 1
SATURDAY
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT). ISOLATED SHOWERS
EARLY IN THE MORNING.
CWR.................20 PERCENT DECREASING TO 10 PERCENT EARLY IN
THE MORNING.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........61 PERCENT.
WIND (20 FT)........NORTH WINDS 6 TO 9 MPH.
MIXING HEIGHT.......600-2500 FT AGL INCREASING TO 2800-3300 FT AGL
IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 12 TO 17 MPH SHIFTING TO THE NORTH
LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR TO FAIR (5300-15000 KNOT-FT) INCREASING TO
FAIR TO GOOD (27800-37300 KNOT-FT) EARLY IN THE
MORNING.
TIME (EDT) 6 AM 9 AM NOON 3 PM
SKY (%).........74 53 42 51
WEATHER COV.....ISOLTD
WEATHER TYPE....RNSHWR NONE NONE NONE
CWR.............20 10 10 10
TEMP............66 67 70 70
RH..............100 81 63 63
20 FT WIND......NW 6G12 N 8G16 N 8G17 N 6G13
MIX HGT (FT)....600 1800 2500 3200
MIXNG WIND......W 12 N 22 N 17 N 13
VRATE KT-FT/10005 34 37 36
FORECASTER...WITT
REQUESTED BY...JOLEEN DUDLEY
TYPE OF REQUEST...PRESCRIBED
.TAG 1816056.0/LWX
.DELDT 09/21/18
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