FPCN39 CWLW 221337
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 22 SEPTEMBER 1997 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       9   15     650   1      9   24    1400   2
KAMLOOPS     KEL       9   16     900   1      9   25    1500   2
OKANAGAN     KEL       9   15     800   1      9   24    1450   2
CASTLEGAR    SPOK      9   15     800   2     30   23    1150   3
CRANBROOK    SPOK      9   12     950   9     42   20    1350   5
REVELSTOKE   KEL       9   10     500   0      9   20    1300   2

*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   SE   9   SE   9
CRANBROOK             VR   5   E    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1700 m         30 C
SPOKANE         1200 m         25 C

TODAY'S VENTING: POOR.

VENTING FOR TUESDAY: POOR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: POOR BECOMING 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   15     950  17     50   22    2200  12
PR. GEORGE   P.G.      9   13     800  10     50   20    1800  10
SMITHERS     P.G.      9   12     700   3     54   18    1800  15
WELLS GRAY   P.G.      9   14    1000  17     50   21    2000  12
FT NLSN      F.N.      9   10     400  12     45   15    1650  11
FT STJOHN    F.N.      9   10    1100   9     45   20    1700   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   15   SW  20
SMITHERS              S   26   S   20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2200 m         28 C
FT. NELSON      3100 m         35 C

TODAY'S VENTING: FAIR.

VENTING FOR TUESDAY: FAIR TO POOR.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR BECOMING GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     13   16     200   4     27   21     500   5
FRASER VLY   QUIL     15   17     200   4     37   25     800   4
SRN VRISL    QUIL     15   15     150   4     30   22     550   4
CNTRL VRISL  QUIL     15   16     200   4     33   24     650   4
NRN VRISL    HRDY     13   14     400   1     14   18     550   1
TERRACE      ANT      58   14     800  19     60   20    1950  15
STEWART      ANT      56   15     600  13     60   20    1900  14

*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    SE  17   S   30   S   24
PORT HARDY   SE  24   S   43   S   41
SANDSPIT     S   46   S   61   S   61

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2000 m         30 C
PORT HARDY      3400 m         28 C
ANNETTE         3300 m         33 C

TODAY'S VENTING: POOR SOUTH TO GOOD NORTH.

VENTING FOR TUESDAY: POOR SOUTH TO GOOD NORTH.

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD.



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


END/JMS