FPCN39 CWLW 081322
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 SATURDAY 8 AUGUST 1998 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      15   19     500   2     97   30    2050   9
KAMLOOPS     KEL      13   20     550   2    100   32    3350  11
OKANAGAN     KEL      12   19     500   2    100   32    3350  11
CASTLEGAR    SPOK     31   21     850   7     99   32    3500   6
CRANBROOK    SPOK      9   18     950   6     92   29    3950   5
REVELSTOKE   KEL      11   19     550   2    100   30    3450  11

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   S   11
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: 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.     16   14    1000  10    100   26    3950  14
PR. GEORGE   P.G.     13   13     800   4    100   22    2450  10
SMITHERS     P.G.      9   13     750   0     50   19    1250   7
WELLS GRAY   P.G.     45   16    1700   6    100   26    4000  14
FT NLSN      F.N.      9   15     400   5    100   24    2500  12
FT STJOHN    F.N.      9   14     700   5    100   22    2650  10

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              S   39   SW

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE NORTHWEST.

VENTING FOR SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     59   17    1000   7     76   24    1500   7
FRASER VLY   QUIL     59   17     950   7     84   26    1650   7
SRN VRISL    QUIL     26   16     550   3     68   23    1400   6
CNTRL VRISL  QUIL     56   18    1050   6     76   25    1550   7
NRN VRISL    HRDY      9   13       0   3     83   18    1300   9
TERRACE      ANT      15   13      50   3    100   15    1400  15
STEWART      ANT      15   13      50   3    100   15    1400  15

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   11   SW  22
PORT HARDY   S   39   S   50   S   57
SANDSPIT     SW  13   S   20   S   31

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD




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


END/MWSO