FPCN39 CWLW 201400
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT FRIDAY 20 AUGUST 1999 FOR TODAY.
VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL       9   23     600   0     69   30    1550   6
KAMLOOPS     KEL      16   23     900   1     78   30    1850   7
OKANAGAN     KEL      16   23     900   1     78   30    1850   7
CASTLEGAR    SPOK     28   24     850   6     64   30    1950   5
CRANBROOK    SPOK      9   23     950   3     94   28    2650   9
REVELSTOKE   KEL      15   22     900   1     70   26    2400   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   SW  17
CRANBROOK             VR   5   S   13

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9   11    1500   3    100   26    3950   8
PR. GEORGE   P.G.      9   11    1350   3    100   25    3700   8
SMITHERS     P.G.      9   14     450   3     28   20     950   5
WELLS GRAY   P.G.      9   11    1500   3    100   26    4000   8
FT NLSN      F.N.      9   19     400   3    100   25    1800  14
FT STJOHN    F.N.     22   20     850   9    100   26    3700  17

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   15   S   31
SMITHERS              S   26   S   31

TODAY'S VENTING: GOOD EXCEPT POOR IN THE BULKLEY VALLEY.

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     64   20     800   5     80   23    1250   9
FRASER VLY   QUIL     51   22    1200   5    100   27    2600  20
SRN VRISL    QUIL      9   20     800   0     67   23    1200   7
CNTRL VRISL  QUIL     64   21    1150   7     75   26    1400   7
NRN VRISL    HRDY     53   17     650   9     55   18     700   9
TERRACE      ANT       9   18     800   3    100   19    1850  16
STEWART      ANT      78   17    1150   9    100   19    1750  12

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   S   19   S   30
PORT HARDY   S   24   S   39   S   52
SANDSPIT     S   48   S   50   S   50

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/WJW
$$$$^^