FPCN39 CWLW 211509
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 PST FRIDAY 21 NOVEMBER 1997 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    2     200   3      9    4     200   3
KAMLOOPS     KEL       9    3     350   3     13    4     450   3
OKANAGAN     KEL       9    3     350   3     14    5     500   3
CASTLEGAR    SPOK     16    3     750   3     19    5     850   3
CRANBROOK    SPOK      9   -1     950   8      9    2     950   8
REVELSTOKE   KEL       9    1     450   3      9    2     450   3

*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   NW   9   NW  24
CRANBROOK             NW  15   NW  44

TODAY'S VENTING: POOR

VENTING FOR SATURDAY: POOR

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.     10   -1     950   7     10    1     950   7
PR. GEORGE   P.G.     22    0     850   8     25    1     900   8
SMITHERS     P.G.      9   -2     500   1     11    0     700   1
WELLS GRAY   P.G.     10   -3    1000   8     24   -1    1200   8
FT NLSN      F.N.     24  -13     500   8     29  -11     550   8
FT STJOHN    F.N.      9   -7     700   8      9   -6     700   8

*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            W   22   NW  41
SMITHERS              SW  26   W   41

TODAY'S VENTING: POOR

VENTING FOR SATURDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     18    9     350   3     73   12    1400   7
FRASER VLY   QUIL     16    9     300   3     66   12    1400   6
SRN VRISL    QUIL     15    6     100   6     54   10     950   6
CNTRL VRISL  QUIL     14    6     100   6     54   10     950   6
NRN VRISL    HRDY      9    7       0   3     46   10     750   6
TERRACE      ANT      10    2     250   9     10    3     250   9
STEWART      ANT       9    4       0   3      9    3       0   3

*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    E   15   VR   5   W   11
PORT HARDY   SE  22   S   19   SW  15
SANDSPIT     S   28   S   30   SW  35

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SATURDAY: POOR

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


END/MWSO