FPCN39 CWLW 051400
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 TUESDAY 5 OCTOBER 1999 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      13   11     550   1     48   19    1150   5
KAMLOOPS     KEL      12   10     600   1     40   16    1100   5
OKANAGAN     KEL      11    8     500   1     40   16    1100   5
CASTLEGAR    SPOK      9   11     500   5     30   16     900   6
CRANBROOK    SPOK      9    9     950   4      9   16     950  10
REVELSTOKE   KEL      10    7     500   1     32   13     950   5

*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    VR   5   SW  17   SW  31
CRANBROOK             W   19   W   46

TODAY'S VENTING: POOR TO FAIR

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   7     69   14    1800  10
PR. GEORGE   P.G.     12    4     750   7     27   13    1000   7
SMITHERS     P.G.     11    5     700   1     24   12     950   4
WELLS GRAY   P.G.     20    2    1200   5     88   14    1950  14
FT NLSN      F.N.     30    2     850   5     43    4    1000   7
FT STJOHN    F.N.     55    4    1300   9     75   10    1750   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  19   SW  33
SMITHERS              S   26   SW  33
TODAY'S VENTING: FAIR AT FORT NELSON OTHERWISE GOOD EXCEPT POOR AT
PRINCE GEORGE AND SMITHERS

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     11   13     100   7    100   16    1050  16
FRASER VLY   QUIL      9   12      50   7    100   16     950  16
SRN VRISL    QUIL     21   14     250   6    100   17    1150  15
CNTRL VRISL  QUIL      9   13      50   4    100   17    1150  15
NRN VRISL    HRDY     12   11     100   3     17   13     300   3
TERRACE      ANT       9    8     200   3     70   12     650  13
STEWART      ANT       9    8       0   2     11   12     150   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   19   SW  26   SW  37
PORT HARDY   S   39   S   43   S   43
SANDSPIT     S   67   S   65   S   67

TODAY'S VENTING: GOOD EXCEPT POOR AT STEWART AND OVER NORTHERN
VANCOUVER ISLAND

VENTING FOR WEDNESDAY: POOR TO FAIR

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

$$$$^^
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