FPCN39 CWLW 041322
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 PDT SUNDAY 4 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      14   10     650   1     54   16    2050   3
KAMLOOPS     KEL      12    8     600   1     76   16    2600   4
OKANAGAN     KEL      13    9     750   1     76   16    2600   4
CASTLEGAR    SPOK     44    9    1000   8    100   14    3500   6
CRANBROOK    SPOK     10    6     950  10     89   13    3950   5
REVELSTOKE   KEL      15    9     900   1     47   13    1900   3

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W    9   W   17
CRANBROOK             VR   5   NW  17

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: 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    5     950  20    100   12    3950  22
PR. GEORGE   P.G.     14    5     750   7     64    8    1300  12
SMITHERS     P.G.     25    7     800   7    100   13    2850  17
WELLS GRAY   P.G.    100    7    2700  20    100   12    4000  22
FT NLSN      F.N.      9    2     400  15     77    4    1000  16
FT STJOHN    F.N.     53    1    1050  17    100    6    1850  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              SW  26   SW

TODAY'S VENTING: GOOD




VENTING FOR MONDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   12     600   0     45   15    1350   3
FRASER VLY   QUIL      9   12     550   0     44   15    1300   3
SRN VRISL    QUIL      9   12     450   0     40   15    1250   3
CNTRL VRISL  QUIL     16   13     750   1     53   17    1800   3
NRN VRISL    HRDY      9    8       0   9     65   13     850   9
TERRACE      ANT      69    9     850  14     94   12    1600  11
STEWART      ANT      10    7      50   4     85   12    1250  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   W   11
PORT HARDY   S   28   SW  24   W   31
SANDSPIT     S   78   SW  59   SW  54

TODAY'S VENTING: FAIR




VENTING FOR MONDAY: FAIR




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


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