FPCN39 CWLW 211400
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 21 SEPTEMBER 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      17   21     750   2     36   30    1500   2
KAMLOOPS     KEL      16   20     800   2     32   28    1450   2
OKANAGAN     KEL      12   16     500   2     28   26    1300   2
CASTLEGAR    SPOK     21   17     800   4     28   26    1150   3
CRANBROOK    SPOK      9   15     950   1     26   25    2000   2
REVELSTOKE   KEL      10   15     500   2     18   21     950   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   SW  20
CRANBROOK             W    9   W   26

TODAY'S VENTING: POOR




VENTING FOR WEDNESDAY: POOR




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.     25   14    1050  13    100   23    2950  14
PR. GEORGE   P.G.     18   13     850   5     73   20    1650  10
SMITHERS     P.G.     14   12     800   2     28   16     950   5
WELLS GRAY   P.G.      9    9     800   2    100   24    4000  14
FT NLSN      F.N.      9   11     400   3     37   18    1050   5
FT STJOHN    F.N.     44   16    1350   6    100   20    3700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   26   W   50
SMITHERS              SW  17   W   50

TODAY'S VENTING: GOOD EXCEPT POOR IN SMITHERS AND FAIR IN FORT NELSON




VENTING FOR WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14   16     200   4     20   20     300   5
FRASER VLY   QUIL     17   18     250   4     34   26     750   4
SRN VRISL    QUIL     14   16     200   3     26   23     450   4
CNTRL VRISL  QUIL     15   17     250   3     28   24     550   4
NRN VRISL    HRDY     41   13     450   9     53   15     650   9
TERRACE      ANT      83   13     900  17    100   16    1350  16
STEWART      ANT      49   13     400  13     94   16    1050  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    VR   5   SW   9   SW  19
PORT HARDY   VR   5   W    9   W   24
SANDSPIT     SW  30   SW  31   SW  33

TODAY'S VENTING:




VENTING FOR WEDNESDAY: POOR




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


END/
$$$$^^