FPCN39 CWLW 071408
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 7 JANUARY 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       9   -4     200   2      9   -3     200   5
KAMLOOPS     KEL       9   -1     350   2      9    0     350   5
OKANAGAN     KEL       9    1     350   2      9    1     350   5
CASTLEGAR    SPOK     29    2     750   8     41    3     950   8
CRANBROOK    SPOK      9   -1     950  10     29    1    1150  10
REVELSTOKE   KEL       9   -1     450   2      9    0     450   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   W   24   W   48
CRANBROOK             NW  11   NW  30

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR THURSDAY: 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.     17  -12    1150   4     19  -10    1200   4
PR. GEORGE   P.G.     25  -12    1050   5     28  -10    1150   5
SMITHERS     P.G.      9  -16     500   1      9  -14     500   1
WELLS GRAY   P.G.     17  -11    1200   4     18  -10    1200   4
FT NLSN      F.N.      9  -30     400   0      9  -28     400   0
FT STJOHN    F.N.      9  -22    1300   0      9  -21    1400   0

*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            VR   5   W   19
SMITHERS              N   20   N   19

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     17    4     250  13     74    6     750  14
FRASER VLY   QUIL     15    3     200   4     36    5     400  10
SRN VRISL    QUIL     12    3     200   4     34    5     450   6
CNTRL VRISL  QUIL      9    1     100   2     12    2     150   2
NRN VRISL    HRDY     14    2     150   6     44    5     750   6
TERRACE      ANT       9   -9     200  10     17   -8     300  10
STEWART      ANT       9   -4       0   9     33   -8     300   9

*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    W   19   W   41   W   54
PORT HARDY   NW  24   NW  33   NW  48
SANDSPIT     N   39   N   44   N   54

TODAY'S VENTING: FAIR TO POOR

VENTING FOR THURSDAY: FAIR

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


END/MWSO