FPCN39 CWLW 191355
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 THURSDAY 19 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   6      9    7     200   6
KAMLOOPS     KEL      58   10     950  10     58   10     950  10
OKANAGAN     KEL       9    6     350   6     18    7     500   6
CASTLEGAR    SPOK     23    4     750   6     25    6     750   6
CRANBROOK    SPOK      9    2     950  19      9    5     950  19
REVELSTOKE   KEL       9    5     450   6     12    6     500   6

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   30   S   61
CRANBROOK             S   17   S   50

TODAY'S VENTING: POOR. LOCALLY GOOD AT KAMLOOPS.

VENTING FOR FRIDAY: 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    6    1400  50    100    8    2150  53
PR. GEORGE   P.G.    100    7    1800  34    100    8    1800  34
SMITHERS     P.G.      9    4     500  12     55    5     970  15
WELLS GRAY   P.G.    100    8    2200  53    100    9    2350  53
FT NLSN      F.N.     50  -16     750  14     55  -14     800  14
FT STJOHN    F.N.     50   -6    1300   9     62   -3    1350  11

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   33   SW  43
SMITHERS              S   50   SW  43

TODAY'S VENTING: GOOD.


VENTING FOR FRIDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    9     100  24    100   11    1050  27
FRASER VLY   QUIL    100   11    1000  24    100   12    1400  27
SRN VRISL    QUIL     31    9     200  13    100   11     900  21
CNTRL VRISL  QUIL      9    8      50  13     81   10     650  19
NRN VRISL    HRDY     46    8     250  21    100   10    1150  24
TERRACE      ANT      10    5     200  42    100    7     850  47
STEWART      ANT       9    6       0  24     38    7     150  24

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  20   SE  28   SE  30
PORT HARDY   S   31   S   37   S   41
SANDSPIT     SW  50   SW  54   S   57

TODAY'S VENTING: GOOD.


VENTING FOR FRIDAY: POOR




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


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