FPCN39 CWLW 211330
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 SATURDAY 21 FEBRUARY 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    6     200   3     20    8     550   3
KAMLOOPS     KEL      75    9    1400   9     89   10    1800   9
OKANAGAN     KEL      14    6     500  12     34    8     700  12
CASTLEGAR    KEL       9    5     500  14     42    7     750  14
CRANBROOK    SPOK      9    4     950  10     29    6    1100  15
REVELSTOKE   KEL       9    4     450   3     11    5     500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  22   SW  50
CRANBROOK             SW  22   SW  54

TODAY'S VENTING: POOR TO FAIR. LOCALLY GOOD KAMLOOPS.

VENTING FOR SUNDAY: 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.    100    4    1500  40    100    7    2450  35
PR. GEORGE   P.G.    100    6    1400  37    100    7    1700  39
SMITHERS     P.G.      9    2     500  14     25    5     500  14
WELLS GRAY   P.G.     58    6    1300  25    100    8    4000  31
FT NLSN      F.N.     18  -13     700   5     20  -11     800   6
FT STJOHN    F.N.     18    0    1100   5     54    2    1150  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   30   SW  37
SMITHERS              S   31   S   37

TODAY'S VENTING: GOOD SOUTH. FAIR LOCALLY POOR NORTH.

VENTING FOR SUNDAY: FAIR TO POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     79    8     500  24    100   10    1400  23
FRASER VLY   QUIL     10    7      50  24    100    9     800  23
SRN VRISL    QUIL     83    9     650  18    100   11    1500  21
CNTRL VRISL  QUIL     11    6     100   8    100    7    1150  20
NRN VRISL    HRDY     10    6       0  17    100    9    1150  20
TERRACE      ANT       9    2     200  25     10    4     200  25
STEWART      ANT       9    4       0  16      9    4       0  16

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  33   SW  44   SW  52
PORT HARDY   SW  41   SW  48   SW  50
SANDSPIT     SW  43   SW  44   SW  44

TODAY'S VENTING: GOOD SOUTH. FAIR TO POOR NORTH.

VENTING FOR SUNDAY: FAIR.


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


END/MWSO