FPCN39 CWLW 271424
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 27 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    4     500   0     60    8    1300   4
KAMLOOPS     KEL       9    3     500   0     60    9    1250   6
OKANAGAN     KEL       9    2     500   0     60    8    1250   6
CASTLEGAR    SPOK      9    4     500   4     25    7     850   5
CRANBROOK    SPOK      9    2     950  11     29    5    1150  11
REVELSTOKE   KEL      10    4     600   1     26    6     900   4

*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    VR   5   S   19   SW  39
CRANBROOK             VR   5   W   20

TODAY'S VENTING: POOR IN THE EAST. GOOD THIS AFTERNOON IN THE WEST.

VENTING FOR SATURDAY: FAIR.




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    0     950  16     80    4    1750  14
PR. GEORGE   P.G.      9    0     700   0     37    4    1050   9
SMITHERS     P.G.      9   -1     500   0     80    3    2500   5
WELLS GRAY   P.G.      9    1    1000  16    100    5    2850  12
FT NLSN      F.N.     26   -8     850   4     26   -8     850   4
FT STJOHN    F.N.     41   -1    1100   9     46    3    1200   9

*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            NW  11   W   13
SMITHERS              NW  13   N   13

TODAY'S VENTING: GOOD IN THE NORTHWEST AND ELSEWHERE ABOVE 1000
METRES THIS AFTERNOON.

VENTING FOR SATURDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     62    8     600  14    100   10    1150  16
FRASER VLY   QUIL     59    8     550  14    100   10    1100  16
SRN VRISL    QUIL     47    8     450  11    100   11    1250  15
CNTRL VRISL  QUIL      9    2      50   5    100    8    1250  15
NRN VRISL    HRDY     17    6     350   3    100    7    1250  10
TERRACE      ANT      83    2    1000  15    100    3    1550  16
STEWART      ANT      82    4     950  12     80    3    1250   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   26   SW  33
PORT HARDY   NW  30   NW  26   W   24
SANDSPIT     VR   5   VR   5   NE  19

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: FAIR




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


END/JDG