FPCN39 CWLW 041440
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 WEDNESDAY 4 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    6     200   0     20    9     700   2
KAMLOOPS     KEL       9    6     500   0     34    9    1000   4
OKANAGAN     KEL       9    6     500   0     45   10    1350   4
CASTLEGAR    SPOK     18    5     800   3     24    9    1050   3
CRANBROOK    SPOK      9    3     950   4     31    6    1550   4
REVELSTOKE   KEL       9    5     500   0     23    7     850   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   SW  33
CRANBROOK             VR   5   W   17

TODAY'S VENTING: POOR THIS MORNING BECOMING FAIR AT TIMES THIS
AFTERNOON.


VENTING FOR THURSDAY: 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.      9    1     950  17     67    5    1400  17
PR. GEORGE   P.G.     13    2     800   3     22    5     950   5
SMITHERS     P.G.     11    2     700   1     19    5     850   3
WELLS GRAY   P.G.      9    2    1000  17    100    6    1850  23
FT NLSN      F.N.      9   -1     400  16      9   -1     400  16
FT STJOHN    F.N.     46    0    1000  16     72    1    1250  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   30   SW  28
SMITHERS              S   30   S   28

TODAY'S VENTING: POOR RISING TO GOOD THIS AFTERNOON OVER THE
SOUTHERN CARIBOO AND PEACE DISTRICT. REMAINING POOR OVER THE BULKLEY
VALLEY AND FORT NELSON AREAS.


VENTING FOR THURSDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    9     100   8     23   11     250   8
FRASER VLY   QUIL      9    9      50   8     46   12     400  13
SRN VRISL    QUIL      9    9       0   4     17   11     150   6
CNTRL VRISL  QUIL      9    9      50   4     17   11     150   6
NRN VRISL    HRDY      9    9       0  14     42   11     300  14
TERRACE      HRDY      9    4     200  18     10    7     250  18
STEWART      HRDY      9    7       0  10      9    7       0  10


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   30   SW  39   S   37
PORT HARDY   S   35   S   41   S   48
SANDSPIT     SW  35   S   37   S   48

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR TO GOOD OVER
SOUTHWEST BC.




VENTING FOR THURSDAY: FAIR




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


END/