FPCN39 CWLW 141455
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 14 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   -5     200   1      9   -4     200   1
KAMLOOPS     KEL      33   -3     900   5     33   -3     900   5
OKANAGAN     KEL      10   -5     500   1     12   -4     600   1
CASTLEGAR    SPOK     17   -4     750   3     18   -3     800   3
CRANBROOK    SPOK     17  -14     900   3     20   -7    1000   3
REVELSTOKE   KEL       9   -7     450   1      9   -6     500   1

*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    S    9   SW  30   W   78
CRANBROOK             SW  30   SW  83

TODAY'S VENTING: Poor.


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.     77   -3    1150  48     77   -3    1150  48
PR. GEORGE   P.G.      9   -8     700  27      9   -7     700  27
SMITHERS     P.G.      9  -12     500   1      9  -11     500   1
WELLS GRAY   P.G.      9   -6    1000  48      9   -7    1000  48
FT NLSN      F.N.     11  -30     550   1     11  -30     550   1
FT STJOHN    F.N.     57  -21    1400   9     45  -20    1450   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
PR. GEORGE            S   43   S   30
SMITHERS              S   17   S   30

TODAY'S VENTING: Generally 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    7     100  20      9    7     100  20
FRASER VLY   QUIL      9    3      50  20      9    4      50  20
SRN VRISL    QUIL      9    8       0   7      9    8       0   7
CNTRL VRISL  QUIL      9    7      50   7      9    6      50   7
NRN VRISL    HRDY      9    7       0  18      9    8       0  18
TERRACE      ANT       9   -8     200   5      9   -6     200   5
STEWART      ANT       9    0       0   5      9   -6       0   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
VANCOUVER    SW  46   SW  65   SW  67
PORT HARDY   S   44   S   50   SW  52
SANDSPIT     VR   5   VR   5   VR   5

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/GF