FPCN39 CWLW 121423
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 PST THURSDAY 12 NOVEMBER 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    4     200   0     35    8    1300   3
KAMLOOPS     KEL       9    1     350   0     34    7    1400   3
OKANAGAN     KEL      13    4     750   1     34    7    1400   3
CASTLEGAR    SPOK      9    3     500   5     21    5     750   5
CRANBROOK    SPOK      9    0     950  29     68    4    1200  29
REVELSTOKE   KEL      12    3     750   1     21    4    1000   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
PENTICTON    SW  13   SW  35   W   83
CRANBROOK             W   22   W   65

TODAY'S VENTING: FAIR

VENTING FOR FRIDAY: FAIR

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.     56    0    1100  36     87    3    1300  36
PR. GEORGE   P.G.     41    1     900  18     75    3    1150  22
SMITHERS     P.G.      9    1     550  14     77    3    1000  22
WELLS GRAY   P.G.     72    2    1250  36    100    5    1800  40
FT NLSN      F.N.      9  -11     400   4     23   -7     400   4
FT STJOHN    F.N.     57    0    1450   8     65    2    1600   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  33   W   37
SMITHERS              SW  11   W   37

TODAY'S VENTING: GOOD

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      9    8     100  17      9   10     100  17
FRASER VLY   QUIL      9    7      50  17      9    9      50  17
SRN VRISL    QUIL      9    9       0   9      9   10       0   9
CNTRL VRISL  QUIL      9    8      50   9      9   10      50   9
NRN VRISL    HRDY     27    7     200  12     72    9     650  14
TERRACE      ANT       9    3     200   7      9    4     200   7
STEWART      ANT      10    5     100   1      9    4      50   1

*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    S   59   SW  85   W   91
PORT HARDY   SW  89   SW 119   SW 122
SANDSPIT     N   17   VR   5   W   20

TODAY'S VENTING: POOR

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