FPCN39 CWLW 121430
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 12 FEBRUARY 1999 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   4     62    6    1500   5
KAMLOOPS     KEL      55    4    1450   5     71    5    1650   7
OKANAGAN     KEL       9    3     350   4     77    6    1800   7
CASTLEGAR    SPOK     17    0     750   3     58    2    1650  10
CRANBROOK    SPOK     10   -4     950  14     60    1    1850  14
REVELSTOKE   KEL       9    1     450   4     30    2     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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   S   33   SW  72
CRANBROOK             SW  20   SW  70

TODAY'S VENTING: GOOD.



VENTING FOR SATURDAY: GOOD



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.    100    1    1450  34    100    4    1650   2
PR. GEORGE   P.G.    100    3    1250  38    100    3    1250  38
SMITHERS     P.G.     60    3     500  17     80    4    1200  17
WELLS GRAY   P.G.     10    1    1420  34    100    4    1900  34
FT NLSN      F.N.      9  -19     750   0      9  -18     750   0
FT STJOHN    F.N.     30   -2     900   6     60   -2    1200  12

*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            S   65   SW  82
SMITHERS              S   56   S   82

TODAY'S VENTING: GOOD EXCPET POOR IN THE FORT NELSON AREA.


VENTING FOR SATURDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  31    100    9     700  42
FRASER VLY   QUIL      9    6      50  31    100    8     850  31
SRN VRISL    QUIL      9    8       0  25    100   10    1150  42
CNTRL VRISL  QUIL      9    6      50  25     90    8     750  25
NRN VRISL    HRDY     75    6     450  23     85    7     550  23
TERRACE      ANT       9    0     200  37     70    1     800  37
STEWART      ANT      12    0     200  38     70    1     800  30

*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    S   54   S   70   SW  61
PORT HARDY   S   56   S   82   S   98
SANDSPIT     S   82   S   87   S   87

TODAY'S VENTING: GOOD.


VENTING FOR SATURDAY: GOOD


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


END/GF