112
FNUS76 KPQR 081746
FWSPQR

Spot Forecast for Mt. St. Helens Heli Ops...USGS
National Weather Service Portland OR
1046 AM PDT Tue Sep 8 2026

Forecast is based on forecast start time of 0000 PDT on September 09.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...High pressure will maintain dry and mostly sunny
conditions on Wednesday. Increasing mid-level clouds are likely by
Thursday morning as a weak front drops across the area, but
conditions are expected to remain dry.

.WEDNESDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
CWR.................0 percent.
Chance of pcpn......0 percent.
Max temperature.....63-75.
Min humidity........34-40 percent.
Wind (20 ft)........
 Slope/valley.......East winds 5 to 9 mph shifting to the southeast
                    5 to 7 mph early in the morning, then becoming
                    light in the afternoon.
CEILING (KFT).......20-25.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........3   17  13  13  17  16  19  21  12  19  19  25
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............53  53  55  59  62  65  66  67  68  68  67  66
RH..............43  44  45  45  43  39  40  39  39  40  45  50
20 FT wind dir..E   E   SE  SE  SE  SE  S   SW  W   W   W   NW
20 FT wind spd..9   8   7   6   4   3   2   3   3   3   4   4
20 FT wind gust.10  10  8   7   6   5   4   4   5   6   6   6
Ceiling (kft)...21  20  15  15  20  25  25  25  24  24  24  24

.WEDNESDAY NIGHT...

CWR.................0 percent.
CWR.................0 percent.
Chance of pcpn......0 percent.
Min temperature.....48-53.
Max humidity........71-84 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming northwest 5 to 6 mph late
                    in the evening.
CEILING (KFT).......22 decreasing to 16.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............64  60  56  55  55  55  55  54  54  53  53  52
RH..............58  67  70  67  63  58  54  54  55  56  72  72
20 FT wind dir..NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW
20 FT wind spd..4   4   3   3   3   5   5   5   6   6   6   6
20 FT wind gust.6   6   5   5   5   7   7   7   10  10  10  10
Ceiling (kft)...24  24  24  22  20  18  18  18  18  18  17  16

.THURSDAY...

CWR.................0 percent.
CWR.................0 percent.
Chance of pcpn......0 percent.
Max temperature.....51-62.
Min humidity........67-78 percent.
Wind (20 ft)........
 Slope/valley.......West winds 5 to 10 mph.
CEILING (KFT).......N/A.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............51  52  52  53  54  56  55  55  55  55  54  54
RH..............73  73  73  74  76  77  78  79  80  78  76  74
20 FT wind dir..NW  NW  W   W   W   W   W   W   W   W   W   W
20 FT wind spd..6   6   7   7   7   8   8   8   10  10  10  9
20 FT wind gust.10  10  10  10  10  13  13  13  14  14  14  14
Ceiling (kft)...

$$
Forecaster...Hartsock
Requested by...Emily Bryant
Type of request...OTHER
.TAG 2621429.0/PQR
.DELDT 09/08/26
.FormatterVersion 2.0.0
.EMAIL ebryant@usgs.gov