FPCN39 CWLW 121514
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 WEDNESDAY 12 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    1     200   1     38    5    1150   6
KAMLOOPS     KEL       9    0     400   1     36    2    1150   4
OKANAGAN     KEL       9    0     450   1     33    2    1150   4
CASTLEGAR    SPOK      9    1     900   5     31    5    1000   5
CRANBROOK    SPOK      9   -5    1050   2     20    0     950   2
REVELSTOKE   KEL       9    0    1000   6     33    4    1200   5

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SE   9   SE  19
CRANBROOK             VR   5   NE   9

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR THURSDAY: POOR TO FAIR

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.     20   -4    1200   4     24    2    1350   4
PR. GEORGE   P.G.     23   -4    1150   3     23   -4    1150   3
SMITHERS     P.G.     31    0    1200   4     33    2    1250   4
WELLS GRAY   P.G.     20   -2    1250   4     21    0    1300   4
FT NLSN      F.N.      9   -8     400   5      9   -2     400   5
FT STJOHN    F.N.      9   -2     700   5      9    1     700   5

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   26   E   24
SMITHERS              SE  43   SE  24

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: POOR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    3     100   5     19    7     150   5
FRASER VLY   QUIL     13    5     100   5     26   11     250  10
SRN VRISL    QUIL     16    5     100   5     25   10     200   5
CNTRL VRISL  QUIL      9    3      50   5     15    5     100   5
NRN VRISL    HRDY     10    6     100   1     18   10     350   3
TERRACE      ANT      22    3     200  15     50    6     250   2
STEWART      ANT       9    4     100   3     22    6     300   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   20   SE  22   SE  30
PORT HARDY   SE  37   SE  43   SE  50
SANDSPIT     SE  39   SE  43   SE  50

TODAY'S VENTING: POOR.

VENTING FOR THURSDAY: POOR.

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


END/MWSO