FPCN39 CWLW 131336
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 13 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  -12     200   5     20  -10     500   5
KAMLOOPS     KEL       9  -12     500   0     22  -10     750   3
OKANAGAN     KEL      22  -10     750   3     26   -9     900   3
CASTLEGAR    SPOK     18   -9     800   3     26   -7    1100   3
CRANBROOK    SPOK      9  -20     950   4      9  -18     950   4
REVELSTOKE   KEL       9  -14     450   0      9  -13     500   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    SW   9   W   28   W   65
CRANBROOK             W   28   W   82

TODAY'S VENTING: POOR.

VENTING FOR WEDNESDAY: 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.      9  -19     950   5      9  -18     950   5
PR. GEORGE   P.G.     11  -21     900   1     11  -20     950   1
SMITHERS     P.G.     11  -20     850   1     12  -18     950   1
WELLS GRAY   P.G.      9  -20    1000   5      9  -19    1000   5
FT NLSN      F.N.      9  -36     400   1      9  -34     400   1
FT STJOHN    F.N.      9  -26     700   3      9  -24     700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  33   W   56
SMITHERS              S   39   SW  56

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    0     100  36      9    3     100  36
FRASER VLY   QUIL      9   -2      50  36      9    1      50  36
SRN VRISL    QUIL      9    1       0  10      9    4       0  10
CNTRL VRISL  QUIL      9    0      50  10      9    2      50  10
NRN VRISL    HRDY     80    2     500  24     89    4     600  24
TERRACE      ANT       9  -13     200   5      9  -12     200   5
STEWART      ANT       9   -5       0   4      9  -12       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    S   41   SW  50   SW  54
PORT HARDY   S   46   S   52   S   54
SANDSPIT     SW  44   SW  50   SW  52

TODAY'S VENTING: POOR.

VENTING FOR WEDNESDAY: POOR

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


END/DB