663
FNUS71 KPBZ 251130
FWSPBZ
SPOT FORECAST FOR NURSERY BOTTOM RX IGNITIONS...THE U.S. FOREST SERVICE
NATIONAL WEATHER SERVICE PITTSBURGH PA
730 AM EDT WED MAR 25 2026
FORECAST IS BASED ON IGNITION TIME OF 1100 EDT ON MARCH 25.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
DRY, QUIET WEATHER WILL CONTINUE TODAY UNDER HIGH PRESSURE.
BOUNDARY LAYER MIXING WILL CREATE A DROP IN RH VALUES DURING THE
LATE MORNING HOURS BEFORE WARM, MOIST ADVECTION FOLLOWS DURING THE
LATE AFTERNOON. MINRH VALUES WILL LIKELY RANGE FROM UPPER-20S TO
LOW-30S. WINDS WILL SHIFT FROM SOUTHEAST TO SOUTH THROUGHOUT THE
DAY.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT).
CHANCE OF PCPN......10 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 64.
MIN HUMIDITY........31 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......5700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 14 MPH SHIFTING TO THE WEST 17
TO 18 MPH LATE IN THE AFTERNOON.
LVORI...............2.
ADI.................27 EARLY IN THE MORNING INCREASING TO 116 IN
THE AFTERNOON.
TIME (EDT) 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........80 77 66 69 63 54 53
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).10 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0
TEMP............51 54 58 61 62 63 64
RH..............43 39 34 31 31 31 31
20 FT WIND DIR..S SW SW SW SW SW SW
20 FT WIND SPD..1 2 2 3 4 4 4
20 FT WIND GUST.5 6 7 8 10 10 10
MIX HGT (KFT)...2.0 3.2 4.3 5.1 5.5 5.7 5.6
TRANSP WIND DIR.S SW SW W W SW W
TRANSP WIND SPD.10 12 14 17 17 17 18
LVORI...........2 1 1 1 1 1 1
ADI.............27 46 71 102 108 111 116
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (45-55 PERCENT) THEN BECOMING
PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (55-65 PERCENT).
CHANCE OF PCPN......10 PERCENT.
CHANCE OF THUNDER...4 PERCENT.
MIN TEMPERATURE.....AROUND 48.
MAX HUMIDITY........76 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......1300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 17 MPH.
LVORI...............3.
ADI.................5 TO 10.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........43 51 43 42 28 24 28 37 49 59 63 64
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 10 10 10 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............62 60 56 53 51 50 50 51 49 51 52 52
RH..............34 39 45 49 52 54 54 56 61 59 62 66
20 FT WIND DIR..SW SW S S S S S S S S SW SW
20 FT WIND SPD..3 2 2 2 2 2 3 3 3 3 3 4
20 FT WIND GUST.10 8 8 8 10 10 11 11 12 12 12 12
MIX HGT (KFT)...4.0 1.6 1.4 1.3 1.4 1.4 1.5 1.7 1.7 1.9 2.0 2.1
TRANSP WIND DIR.SW SW SW S S SW SW SW SW SW SW SW
TRANSP WIND SPD.17 10 12 12 13 14 14 15 15 15 15 15
LVORI...........2 2 2 2 2 2 2 3 3 3 3 3
ADI.............8 5 5 5 6 6 6 7 7 7 7 10
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). CHANCE OF RAIN
EARLY IN THE MORNING.
CHANCE OF PCPN......40 PERCENT.
CHANCE OF THUNDER...13 PERCENT.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........60 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 8 MPH WITH
GUSTS TO AROUND 18 MPH IN THE LATE MORNING AND
AFTERNOON.
MIXING HEIGHT.......3400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 14 TO 22 MPH.
LVORI...............2.
ADI.................26 TO 55.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........76 81 72 75 74 73 74 76 77 72 66 61
WEATHER COV..... CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE.... RN RN RN RN RN RN RN RN RN RN
TSTM COV........
CHC OF PCPN (%).10 10 40 40 40 40 40 40 30 30 30 30
CHC OF THDR (%).0 0 10 10 10 10 10 10 10 10 10 10
TEMP............53 53 53 55 57 60 63 66 68 69 69 69
RH..............67 70 76 74 72 70 67 63 61 60 61 62
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..4 3 3 4 5 5 6 6 7 7 7 7
20 FT WIND GUST.12 12 12 13 14 14 16 17 18 18 18 18
MIX HGT (KFT)...1.9 1.9 1.8 2.0 2.3 2.8 3.2 3.4 3.3 3.3 3.3 3.2
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.14 15 14 16 15 18 20 21 21 22 22 22
LVORI...........3 3 3 3 3 3 1 1 1 1 1 1
ADI.............26 36 31 31 31 43 49 51 52 54 55 54
FORECASTER...LUPO
REQUESTED BY...JOHN WORSLEY
TYPE OF REQUEST...PRESCRIBED
.TAG 2607697.0/PBZ
.DELDT 03/25/26
.FORMATTERVERSION 2.0.0
.EMAIL JOHN.WORSLEY@USDA.GOV,SHAWN.OTTO@USDA.GOV
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