FPCN39 CWLW 071348
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 7 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    4     450   0      9    7     550   0
KAMLOOPS     KEL      20    5     500  10     28    7     550  10
OKANAGAN     KEL       9    4     500   0     25    8     650   5
CASTLEGAR    SPOK      9    4     500   3     16    6     750   3
CRANBROOK    SPOK      9    2     950   5      9    4     950   5
REVELSTOKE   KEL       9    2     500   0      9    3     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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   S   33
CRANBROOK             SW   9   SW  26

TODAY'S VENTING: POOR.

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.     43    4    1200  15     43    6    1200  15
PR. GEORGE   P.G.     30    0     950  12     30    1     950  12
SMITHERS     P.G.     24    0     800   6     30    1     900   6
WELLS GRAY   P.G.      9    0    1000  14      9    2    1000  14
FT NLSN      F.N.      9  -18     400   7     24  -13     600   7
FT STJOHN    F.N.     30  -11     900   5     30  -10     900   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   S   41
SMITHERS              SE  44   S   41

TODAY'S VENTING: POOR EXCEPT FAIR SOUTH OF QUESNEL.

VENTING FOR SUNDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   11     100  40    100   14    2150  47
FRASER VLY   QUIL    100   14    2050  47    100   15    2400  49
SRN VRISL    QUIL      9    9       0  28    100   13    1300  42
CNTRL VRISL  QUIL      9   10      50  28    100   10    1250  28
NRN VRISL    HRDY     11    9      50  33    100   11    1050  39
TERRACE      ANT       9    2     200  33     60    3     400  33
STEWART      ANT       9    5       0   4     60    3     400  33

*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    SE  31   S   39   S   44
PORT HARDY   S   50   S   63   S   70
SANDSPIT     S   94   S   89   S   78

TODAY'S VENTING: GOOD WHERE IT IS WINDY.

VENTING FOR SUNDAY: FAIR.




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


END/JDG