FPCN39 CWLW 271338
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 MONDAY 27 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      22   11     600   3    100   17    3200   9
KAMLOOPS     KEL      47   11    1250   5    100   15    3350   9
OKANAGAN     KEL      13    8     550   2    100   14    3350   9
CASTLEGAR    SPOK     31    8     850   7    100   15    3500   7
CRANBROOK    SPOK      9    4     950  10    100   11    3950   8
REVELSTOKE   KEL      11    7     550   2     68   12    1750   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   19   N   20
CRANBROOK             VR   5   N   19

TODAY'S VENTING: POOR TO FAIR BECOMING GOOD BY NOON.


VENTING FOR TUESDAY: 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    3     950   4     80    8    2950   6
PR. GEORGE   P.G.     43    4    1050  11    100   10    3700   5
SMITHERS     P.G.     28    5     900   5     76    9    1600   3
WELLS GRAY   P.G.     40    3    1200  10    100    9    4000  16
FT NLSN      F.N.     85    8    1000  21    100   14    3400  10
FT STJOHN    F.N.     77    5    1050  28    100   11    3700  12

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   NW  19
SMITHERS              SW  11   W   19

TODAY'S VENTING: POOR TO FAIR BECOMING GOOD BY NOON.




VENTING FOR TUESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     55   12     950   7     92   16    1800   8
FRASER VLY   QUIL     55   12     950   7     98   17    1900   9
SRN VRISL    QUIL     55   10     250   3     87   16    1700   8
CNTRL VRISL  QUIL     44   11     550   2     74   15    1350   7
NRN VRISL    HRDY     12    9     100   4     80   13    1000   6
TERRACE      ANT      23    8     600   4     65   11    1550   6
STEWART      ANT      14    8     150   3     42   11    1050   4

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


FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NE  13   N   13
PORT HARDY   VR   5   S   11   W    9
SANDSPIT     S   20   SW  19   S   30

TODAY'S VENTING: GENERALLY GOOD ON THE SOUTH COAST AND THE SOUTH
ISLAND.  POOR TO FAIR ON NORTH VANCOUVER ISLAND AND NORTH COAST
BECOMING GOOD IN THE AFTERNOON ON NORTH VANCOUVER ISLAND AND THE
NORTH COAST EXCEPT POOR INLAND ON THE NORTH COAST.


VENTING FOR TUESDAY: FAIR




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

END/LM