FPCN39 CWLW 221400
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 WEDNESDAY 22 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      23   21     650   3     89   31    2000   8
KAMLOOPS     KEL      17   19     600   3     60   28    1500   6
OKANAGAN     KEL      12   17     500   2     59   28    1500   6
CASTLEGAR    SPOK     19   18     800   4     76   29    1850   7
CRANBROOK    SPOK      9   17     950   5     80   27    3950   9
REVELSTOKE   KEL      10   15     500   2     26   21     850   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   W   28
CRANBROOK             W   11   W   26

TODAY'S VENTING: GOOD.


VENTING FOR THURSDAY: 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.      9   12     950   8     79   21    2350  12
PR. GEORGE   P.G.     17   11     900   4     32   16    1000   5
SMITHERS     P.G.     16   11     800   3     32   15     950   3
WELLS GRAY   P.G.     29   13    1200   5     80   21    2600  13
FT NLSN      F.N.      9    9     400   0     48   16     950   8
FT STJOHN    F.N.     39   13    1000  12     89   21    2750  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            SW  35   SW  63
SMITHERS              SW  70   SW  63

TODAY'S VENTING: GOOD EXCEPT FAIR NORTHWEST.


VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     17   16     400   3     19   20     500   3
FRASER VLY   QUIL     19   17     450   3     22   24     600   3
SRN VRISL    QUIL     13   15     300   2     19   22     500   2
CNTRL VRISL  QUIL     17   17     450   2     19   23     550   2
NRN VRISL    HRDY     10   11     100   1     19   15     350   3
TERRACE      ANT      56   13     350  42     72   15     500  42
STEWART      ANT       9   12       0  23     78   15     350  30

*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   11   SW  26   SW  35
PORT HARDY   S   54   SW  67   SW  80
SANDSPIT     SW  72   SW  89   SW 107

TODAY'S VENTING: POOR EXCEPT GOOD NORTH COAST.

VENTING FOR THURSDAY: GOOD




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


END/MWSO
$$$$^^