FPCN39 CWLW 211332
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 WEDNESDAY 21 OCTOBER 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      13    8     550   1     23   14    1150   2
KAMLOOPS     KEL      12    7     600   1     19   11    1050   2
OKANAGAN     KEL      11    6     550   1     21   12    1150   2
CASTLEGAR    SPOK     17    7     750   3     27   12     900   5
CRANBROOK    SPOK      9    4     950   8     21   12    1100   8
REVELSTOKE   KEL      11    6     600   1     18   10    1050   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   22   S   24
CRANBROOK             VR   5   S   17

TODAY'S VENTING: POOR.


VENTING FOR THURSDAY: POOR


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    7     950  27     49   14    1450  12
PR. GEORGE   P.G.      9    7     850   0     45   14    1200   8
SMITHERS     P.G.      9    6     750   0     48   14    1100   8
WELLS GRAY   P.G.      9    7    1000  27     49   13    1400  12
FT NLSN      F.N.      9    7     400  19     10   15     400  19
FT STJOHN    F.N.      9    9     700  19     64   16    1050  20


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   SW  50
SMITHERS              S   35   SW  50

TODAY'S VENTING:  POOR THIS MORNING AND ONLY FAIR THIS AFTERNOON DUE
TO THE PRESENCE OF A STRONG RIDGE OF HIGH PRESSURE. GOOD IN THE
PEACE COUNTRY DUE TO INCREASED WINDS IN CHINOOK CONDITIONS.


VENTING FOR THURSDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100   2     12   16     250   2
FRASER VLY   QUIL     11   13     150   2     20   21     350   4
SRN VRISL    QUIL      9   11     100   0     12   18     250   1
CNTRL VRISL  QUIL      9   12     100   0     16   20     300   3
NRN VRISL    HRDY      9    9       0   5     27   14     350   6
TERRACE      ANT      10    8     250  19     10   11     250  19
STEWART      ANT       9    7       0  11     36   11     250  13


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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  28   S   31   S   28
PORT HARDY   S   41   S   43   S   50
SANDSPIT     S   52   S   54   S   59

TODAY'S VENTING:  POOR.


VENTING FOR THURSDAY: POOR

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


END/GF