FPCN39 CWLW 271359
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 TUESDAY 27 OCTOBER 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      12   10     500   4     63   14     900  10
KAMLOOPS     KEL      11    9     550   7     54   14     900  10
OKANAGAN     KEL      15   10     700   2     54   14     900  10
CASTLEGAR    SPOK     12    9     800   2     38   13     900   8
CRANBROOK    SPOK      9    6     950   3     50   12    1350  12
REVELSTOKE   KEL      10    7     500   3     32   10     850   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   22   S   46
CRANBROOK             S   19   S   52

TODAY'S VENTING: FAIR TO POOR

VENTING FOR WEDNESDAY: 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    8     950  12     57   12    1300  17
PR. GEORGE   P.G.     16    7     850   5     30   10     900  10
SMITHERS     P.G.      9    5     500   2     38    8     850  10
WELLS GRAY   P.G.     10    7    1000  12     39   10    1200  17
FT NLSN      F.N.      9   -3     400  11      9    2     400  11
FT STJOHN    F.N.      9    3     700  11     63    9    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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   57   S   67
SMITHERS              S   56   S   67

TODAY'S VENTING: FAIR TO POOR EXCEPT LOCALLY GOOD EAST.

VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   11     100   8     51   15     500  12
FRASER VLY   QUIL      9   12     200   8     59   16     600  12
SRN VRISL    QUIL      9   11     150   0     26   14     250   8
CNTRL VRISL  QUIL      9   11     150   0     26   14     250   8
NRN VRISL    HRDY      9   11       0   4     33   13     350   8
TERRACE      ANT       9    5     220  15     40    7     450  15
STEWART      ANT       9    8       0  15     51    7     350  15

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   19   S   35   S   50
PORT HARDY   W   33   W   30   SW  41
SANDSPIT     W   63   W   70   W   67

TODAY'S VENTING: FAIR TO POOR LOCALLY GOOD.

VENTING FOR WEDNESDAY: POOR

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


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