FPCN39 CWLW 221415
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 TUESDAY 22 DECEMBER 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  -10     200   0      9   -8     200   0
KAMLOOPS     KEL       9   -9     350   0     27   -8    1150   2
OKANAGAN     KEL      26   -8    1150   2     37   -7    1500   3
CASTLEGAR    SPOK      9  -12     500   3     33   -9    1350   3
CRANBROOK    SPOK      9  -20    1050   3     15  -15    1300   3
REVELSTOKE   KEL       9  -13     450   0      9  -11     450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  24   N   50
CRANBROOK             NW  13   NW  41

TODAY'S VENTING: POOR TO FAIR.




VENTING FOR WEDNESDAY: 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.     25  -13    1250   5     27  -12    1300   5
PR. GEORGE   P.G.      9  -15     700   4     24  -13    1100   4
SMITHERS     P.G.      9  -15     500   2     13  -13     700   2
WELLS GRAY   P.G.      0  -17    1100   2     27  -11    1350   5
FT NLSN      F.N.      9  -19     400   0      9  -14     500   0
FT STJOHN    F.N.      9  -14     700  10      9  -13     700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  19   NW  41
SMITHERS              NW  31   NW  41

TODAY'S VENTING: POOR.




VENTING FOR WEDNESDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   -5     100   4     21   -1     400   4
FRASER VLY   QUIL      9   -6      50   4     15   -3     200   4
SRN VRISL    QUIL     17   -1     350   3     30    1     650   4
CNTRL VRISL  QUIL     17   -1     350   3     20    0     450   3
NRN VRISL    HRDY     11    0     250   1     30    1     550   4
TERRACE      ANT       9  -10     200   5      9   -7     200   5
STEWART      ANT       9  -10     100   5      9   -7       0   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NW  30   NW  43
PORT HARDY   NW   9   NW  20   NW  31
SANDSPIT     NW  22   NW  30   NW  33

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR WEDNESDAY: FAIR




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


END/MWSO