FPCN39 CWLW 221325
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 22 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      20    8     550   3     36   14    1150   3
KAMLOOPS     KEL      18    7     700   3     29   11    1050   3
OKANAGAN     KEL      25    8     900   3     31   12    1150   3
CASTLEGAR    SPOK      9    7     500   4     23   12     850   4
CRANBROOK    SPOK      9    4     950   2     39   11     950   7
REVELSTOKE   KEL      10    5     450   3     23    8     950   3

*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   S   11   S    9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR TO FAIR

VENTING FOR FRIDAY: 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    6     950  25     10   14     950  15
PR. GEORGE   P.G.     18    6     850   7     50   14    1100  12
SMITHERS     P.G.      9    6     750   0     52   14    1050  10
WELLS GRAY   P.G.      9    6    1000  25     10   13    1000  15
FT NLSN      F.N.     15    4     450  10     45   10     800  10
FT STJOHN    F.N.     25    8     850  10     77   16    1700  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            SW  22   SW  39
SMITHERS              S   30   SW  39

TODAY'S VENTING: FAIR TO POOR EXCEPT GOOD IN THE PEACE

VENTING FOR FRIDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15   11     150  11     24   17     200  11
FRASER VLY   QUIL     20   13     150  11     40   22     400  10
SRN VRISL    QUIL     18   11     100   9     29   18     250  10
CNTRL VRISL  QUIL     20   12     150  10     29   19     250  10
NRN VRISL    HRDY      9    9       0   7     21   14     200   7
TERRACE      ANT       9    6     200  27     10   11     250  27
STEWART      ANT       9    7      50   0     11   11     100   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  15   S   19   SW  17
PORT HARDY   S   37   S   41   S   46
SANDSPIT     S   57   S   61   S   65

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR FRIDAY: FAIR

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

END/MWSO