FPCN39 CWLW 191432
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 NOVEMBER 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    2     200   2     55    6     750  10
KAMLOOPS     KEL       9    1     350   2     55    6    1000  10
OKANAGAN     KEL       9    2     350   2     36    6    1100   4
CASTLEGAR    SPOK      9    1     500   4     25    6    1050   3
CRANBROOK    SPOK      9   -2     950   3      9    3     950   3
REVELSTOKE   KEL       9    0     450   2     14    3     650   2

*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    S   11   S   24   SW  41
CRANBROOK             W   15   W   43

TODAY'S VENTING: POOR TO FAIR EXCEPT JUST IN THE GOOD IN THE
SOUTHWEST THIS AFTERNOON.

VENTING FOR FRIDAY: FAIR TO 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.     10   -3     950  28     64    0    1400  18
PR. GEORGE   P.G.     11   -6     750   2     32   -1    1050   7
SMITHERS     P.G.     26   -3     850   6     43    1    1050   7
WELLS GRAY   P.G.      9   -3    1000  28     45    0    1450  12
FT NLSN      F.N.      9  -19     400  17     28  -13     500  17
FT STJOHN    F.N.      9  -13     700  17      9   -6     700  17

*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   54   SW  48
SMITHERS              SW  39   SW  48

TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD THIS AFTERNOON IN THE
SOUTHWEST.

VENTING FOR FRIDAY: FAIR TO 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  18     84   10     500  28
FRASER VLY   QUIL      9    7      50  18    100   11     750  32
SRN VRISL    QUIL      9    8       0   8     95   11     650  26
CNTRL VRISL  QUIL      9    8      50   8     63   10     350  21
NRN VRISL    HRDY     80    6     850  15    100    9     850  21
TERRACE      ANT       9    0     200  33      9    2     200  33
STEWART      ANT       9    3       0  25      9    2       0  25

*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    S   46   S   56   S   46
PORT HARDY   S   48   S   63   S   67
SANDSPIT     S   61   S   65   S   61

TODAY'S VENTING: GOOD IN THE SOUTH. POOR IN THE NORTH.

VENTING FOR FRIDAY: GOOD.


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


END/JDG