FPCN39 CWLW 281437
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 WEDNESDAY 28 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       9    8     200   1     94   12    1800   4
KAMLOOPS     KEL       9    7     350   1     94   12    2000   9
OKANAGAN     KEL       9    6     350   1     94   11    1850   5
CASTLEGAR    SPOK      9    8     500  14     88   11    1200  19
CRANBROOK    SPOK     92    8    1450  29    100   10    2150  29
REVELSTOKE   KEL       9    5     450   1     80    8    1500  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   22   W   31
CRANBROOK             W   13   W   31

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: 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.    100    3    1750  23    100    8    3950  23
PR. GEORGE   P.G.     39    4     950  12    100    8    2600  20
SMITHERS     P.G.      9    3     550   6    100    7    1700  17
WELLS GRAY   P.G.    100    4    2200  25    100    8    4000  23
FT NLSN      F.N.      9    0     400  10     52    2     900  10
FT STJOHN    F.N.     53    1    1250  10    100    7    1600  15

*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            SW  37   W   52
SMITHERS              SW  41   W   52

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     27    9     400   6    100   12    1650  14
FRASER VLY   QUIL     25    9     350   6    100   12    1600  14
SRN VRISL    QUIL      9    7     150   0    100   12    1500  12
CNTRL VRISL  QUIL     11    8     200   2    100   12    1550  12
NRN VRISL    HRDY     19    8     150   8    100   12    1850  14
TERRACE      ANT      10    4     250  16     87    7     900  20
STEWART      ANT       9    5       0   2     80    7     900  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   W   15   W   26
PORT HARDY   S   43   S   50   SW  44
SANDSPIT     S   24   S   35   SW  37

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: FAIR




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


END/JDG