FPCN39 CWLW 131322
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 SUNDAY 13 SEPTEMBER 1998 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   17     200   2     64   25    1500   7
KAMLOOPS     KEL      12   18     500   2     95   27    2850   6
OKANAGAN     KEL      11   16     450   2     95   27    2850   6
CASTLEGAR    SPOK     14   17     750   2     61   25    1250   9
CRANBROOK    SPOK      9   14     950  14     99   24    2300  12
REVELSTOKE   KEL       9   13     450   2     17   21     850   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   VR   5   W   17
CRANBROOK             W    9   W   20

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.     ##   ##     ###  ##    100   21    3950  17
PR. GEORGE   P.G.      9   10     700   3    100   19    3700  14
SMITHERS     P.G.      9    6     500   3    100   16    2550  13
WELLS GRAY   P.G.    100   12    2600  17    100   22    4000  17
FT NLSN      F.N.     10    9     400  24    100   15    2500  27
FT STJOHN    F.N.    100   10    1700  28    100   18    3700  29

*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
SMITHERS              W    9   W

TODAY'S VENTING: GOOD

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     12   15     150   3     75   20    1100  10
FRASER VLY   QUIL     43   18     600   7    100   25    1750  12
SRN VRISL    QUIL      9   15       0   0     74   21    1200   8
CNTRL VRISL  QUIL     27   18     550   4     98   24    1550  11
NRN VRISL    HRDY     18   12     150   8     86   16    1100  12
TERRACE      ANT       9   10     500   2    100   16    2500  10
STEWART      ANT      21   12     550   2     92   16    1900   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
VANCOUVER    VR   5   VR   5   W   17
PORT HARDY   N   11   VR   5   W   19
SANDSPIT     VR   5   SW  11   SW  17

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

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


END/MWSO