FPCN39 CWLW 021400
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 THURSDAY 2 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      68   17    1300   7    100   23    3200  10
KAMLOOPS     KEL      60   15    1250   7    100   23    3350  10
OKANAGAN     KEL      25   12     650   5    100   21    3350  10
CASTLEGAR    SPOK     36   14     950   7    100   20    3500   8
CRANBROOK    SPOK      9   11     950  10    100   19    3950   9
REVELSTOKE   KEL      20   11     650   5    100   18    2300  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE  13   NE  15
CRANBROOK             E   11   E   24

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: 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    8     950   9    100   16    3950   7
PR. GEORGE   P.G.     23    7     850   9     85   15    2300   8
SMITHERS     P.G.     33    9     850   8     91   17    2400   8
WELLS GRAY   P.G.     33    9     850   8    100   16    4000   7
FT NLSN      F.N.     19   13     550   7    100   20    3400  19
FT STJOHN    F.N.      9   11     700  24    100   18    3700  21

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   11
SMITHERS              W   11   NW  11

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19   15     250   6    100   20    1600  12
FRASER VLY   QUIL     20   15     250   6    100   22    1800  12
SRN VRISL    QUIL     19   14     200   5    100   22    1700  11
CNTRL VRISL  QUIL     19   15     250   5    100   22    1700  11
NRN VRISL    HRDY     11   12      50   4     60   18     900   8
TERRACE      P.G.     50   12     850   8     71   17    1250   8
STEWART      P.G.     58   13     850   8     68   17    1000   8

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NE  13   NE  19
PORT HARDY   N   11   N   13   N   26
SANDSPIT     W   11   NW  19   N   30

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD




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

END/
$$$$^^