005
FNUS76 KPQR 211128
FWSPQR
SPOT FORECAST FOR LAKE UNIT PILE BURNING...USFS
NATIONAL WEATHER SERVICE PORTLAND OR
328 AM PST WED JAN 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 PST ON JANUARY 21.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
LIGHT OFFSHORE FLOW CONTINUES THROUGH THE END OF THE
WEEK DUE TO PERSISTENT HIGH PRESSURE. WINDS OVER THE BURN AREA WILL
BE FROM THE EAST GENERALLY LESS THAN 10 MPH. DAYTIME MINIMUM RH
EXPECTED TO BE IN THE 50S WITH GOOD OVERNIGHT RECOVERIES IN THE 80S.
THERE IS A STRONG SUBSIDENCE INVERSION OVER THE REGION THAT HAS LEAD
TO POOR DAYTIME RH VALUES IN THE 20S AND POOR TO MODERATE OVERNIGHT
RECOVERIES. HOWEVER, BASED ON OBSERVATIONS AT THE NEARBY RED BOX RAWS,
THE BURN SITE SEEMS TO BE ABOVE THE INVERSION.
TODAY
SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 41.
MIN HUMIDITY........51-56 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS 4 TO 7 MPH WITH GUSTS UP TO 11 MPH.
MIXING HEIGHT.......1200 FT AGL.
TRANSPORT WINDS.....EAST 10 TO 14 MPH.
TIME (PST) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........47 59 50 37 23 17
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
CHC OF LTNG (%).0 0 0 0 0 0
TEMP............21 22 27 35 38 36
RH..............79 80 69 57 52 59
20 FT WIND......E 5 E 5 E 5 E 5 E 4 E 4
20 FT WIND GUST.12 12 12 11 10 10
MIX HGT (FT)....1000 1100 1100 1200 1200 1000
TRANSPORT WIND..E 14 E 14 E 13 E 10 E 10 E 12
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................1 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....AROUND 21.
MAX HUMIDITY........80-85 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS 3 TO 5 MPH.
MIXING HEIGHT.......1000 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 13 MPH.
TIME (PST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
SKY (%).........12 8 10 7 16 27
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
CHC OF LTNG (%).0 0 0 0 0 0
TEMP............32 27 26 24 24 23
RH..............72 77 80 85 84 78
20 FT WIND......E 4 E 4 E 4 E 3 E 3 E 3
20 FT WIND GUST.10 10 8 7 6 6
MIX HGT (FT)....1000 1000 1000 1000 1000 1000
TRANSPORT WIND..E 13 E 13 E 13 E 12 E 9 E 9
THURSDAY
SKY/WEATHER.........PARTLY CLOUDY.
CWR.................1 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 43.
MIN HUMIDITY........51-56 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS 4 TO 6 MPH.
MIXING HEIGHT.......2000 FT AGL.
TRANSPORT WINDS.....EAST 7 TO 10 MPH.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........27 24 24 24 30 30 30 41 41 41 58 58
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............23 22 21 25 29 32 36 40 39 39 38 35
RH..............73 74 73 69 64 63 59 54 58 62 66 70
20 FT WIND DIR..E E E E E E E E E E NE NE
20 FT WIND SPD..3 3 3 3 3 3 3 4 4 4 1 1
20 FT WIND GUST.6 5 5 5 6 6 6 6 6 6 6 6
MIX HGT (KFT)...1.0 1.0 1.0 0.9 1.0 1.4 1.8 2.0 1.8 1.5 1.2 1.0
TRANSP WIND DIR.E E E E E E E E E E E E
TRANSP WIND SPD.8 8 9 9 9 8 7 7 7 8 9 10
FORECASTER...HEC
REQUESTED BY...JOSEPH SCHWEDHELM
TYPE OF REQUEST...PRESCRIBED
.TAG 2600719.0/PQR
.DELDT 01/21/26
.FORMATTERVERSION 2.0.0
.EMAIL COLIN.ALBRIGHT@USDA.GOV,JOSEPH.SCHWEDHELM@USDA.GOV
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