FPCN39 CWLW 191455 CCA
CORRECTED SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR
INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE
OF ENVIRONMENT CANADA AT 7.49 AM PDT SUNDAY 19 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      15   16     600   6     98   30    3200   6
KAMLOOPS     KEL      18   15     600   6     98   29    3350   6
OKANAGAN     KEL      17   14     650   6     98   26    3000   6
CASTLEGAR    SPOK     14   14     700   5     80   27    3200   6
CRANBROOK    SPOK     12   13    1200   4     80   24    3300   6
REVELSTOKE   KEL      98   12     700   6     98   26    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

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.     15   12    1150  12     88   22    2150  11
PR. GEORGE   P.G.     18   11     800  10     47   21    1200   9
SMITHERS     P.G.     15   11     900   8     33   18     950   6
WELLS GRAY   P.G.     25   14    1250   7    100   24    4000  12
FT NLSN      F.N.     16   12     900   1     35   22     950   1
FT STJOHN    F.N.     15   12     900   6     40   21     950   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
PR. GEORGE            S   26   SW  35
SMITHERS              SW  41   SW  35

TODAY'S VENTING: POOR IN NORTHEAST FAIR IN NORTH AND GOOD SOUTHERN
 CARIBOO

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     33   25     650   8     65   20     950  13
FRASER VLY   QUIL     33   28     850   8     77   27     880  13
SRN VRISL    QUIL     22   26     700   8     26   23     750   2
CNTRL VRISL  QUIL     33   27     800   9     61   25     900   8
NRN VRISL    HRDY     22   22     650   5     38   15     800   3
TERRACE      ANT      10   22     300  11    100   14    3200  12
STEWART      ANT      29   22     350  11    100   14    2200  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S    9   SW   9
PORT HARDY   W   13   SW  20   SW  37
SANDSPIT     W   24   W   33   SW  44

TODAY'S VENTING: GOOD NORTH COAST AND INLAND SOUTH COAST. POOR TO
FAIR ISLAND AREAS.


VENTING FOR MONDAY: POOR


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



END/