FPCN39 CWLW 161438
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 FRIDAY 16 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      20    2     550   3     37    4     750   5
KAMLOOPS     KEL      23    1     650   5     48    4    1150   6
OKANAGAN     KEL      14    0     500   3     32    3     800   5
CASTLEGAR    SPOK     20    2     850   3     21    3     900   3
CRANBROOK    SPOK      9    1     950  10     45    2    1350  10
REVELSTOKE   KEL      18    0     650   5     18    0     650   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   W   26   W   59
CRANBROOK             W   24   W   67

TODAY'S VENTING: Fair.


VENTING FOR SATURDAY: 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.     63    0    1200  26    100    2    1750  26
PR. GEORGE   P.G.      9   -9     700   9     21   -5     850   9
SMITHERS     P.G.     21   -5     800   5     30    0     900   6
WELLS GRAY   P.G.      9   -4    1000  26     79    1    1500  26
FT NLSN      F.N.      9  -29     400   8     21  -26     550   8
FT STJOHN    F.N.      9  -19     700  10      9  -18     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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   W   44
SMITHERS              S   48   SW  44

TODAY'S VENTING: Good over higher elevations otherwise poor.


VENTING FOR SATURDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    6     100  34    100    8     650  36
FRASER VLY   QUIL     11    6      50  34    100    8     650  34
SRN VRISL    QUIL     63    7     350  21    100    9     750  29
CNTRL VRISL  QUIL      9    5      50   8     92    6     600   8
NRN VRISL    HRDY      9    6       0  31     90    6     800  31
TERRACE      ANT       9   -3     200  36      9   -4     200  36
STEWART      ANT       9    1       0  15      9   -4       0  15


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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  31   SW  46   SW  57
PORT HARDY   SW  50   SW  61   SW  67
SANDSPIT     SW  96   SW  94   SW  85

TODAY'S VENTING: Good on the Coast. Poor in inland areas of the North
Coast.


VENTING FOR SATURDAY: POOR


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


END/GF