FPCN39 CWLW 301400
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 30 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      12   13     500   1     74   18    1450   7
KAMLOOPS     KEL      40   13     850   7     66   16    1400   7
OKANAGAN     KEL      23   12     650   5     66   16    1400   7
CASTLEGAR    SPOK     18   10     800   3     45   17    1200   6
CRANBROOK    SPOK      9    9     950  11    100   15    3950   8
REVELSTOKE   KEL       9    9     450   1     34   12     850   7

*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    N    9   N   22   N   31
CRANBROOK             VR   5   NW  13

TODAY'S VENTING: GOOD EXCEPT FAIR IN REVELSTOKE




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.     31    5    1400   5    100   11    2600  12
PR. GEORGE   P.G.     19    4     850   7     76   10    2050   7
SMITHERS     P.G.     12    6     850   1     40    9    1350   4
WELLS GRAY   P.G.      9    2     850   2    100   11    2750  12
FT NLSN      F.N.      9    0     400   0      9    2     650   0
FT STJOHN    F.N.      9    1     700  10     28    3     900  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
PR. GEORGE            NW  19   NW  28
SMITHERS              NW  19   NW  28

TODAY'S VENTING: GOOD EXCEPT POOR NORTHEAST AND FAIR SMITHERS




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     46   13     700   7     62   17    1200   6
FRASER VLY   QUIL     42   12     600   7     81   21    2000   6
SRN VRISL    QUIL      9   12     550   0     57   18    1300   5
CNTRL VRISL  QUIL      9   12     550   0     57   18    1300   5
NRN VRISL    HRDY     41   11     550   7     66   14     900   9
TERRACE      ANT      63    8     700  15    100   13    1950  16
STEWART      ANT      19    9     150   7    100   13    1600  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   15   N   19   N   31
PORT HARDY   N   33   N   41   N   43
SANDSPIT     N   35   N   37   NW  44

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/
$$$$^^