FPCN39 CWLW 051428
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 5 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      21    9     700   3     41   11    1150   4
KAMLOOPS     KEL      16    7     600   3     43   10    1300   4
OKANAGAN     KEL       9    7     600   0     34    9    1050   4
CASTLEGAR    SPOK     20    6     750   4     28    8     950   4
CRANBROOK    SPOK      9    2     950   5     29    6    1350   5
REVELSTOKE   KEL       9    5     450   0     22    7     800   4


*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   VR   5   VR   5
CRANBROOK             VR   5   SE  22

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR THIS AFTERNOON
OVER WESTERN SECTIONS.

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.      9    3     950   9     79    6    1800  13
PR. GEORGE   P.G.     22    4    1000   4     41    6    1350   6
SMITHERS     P.G.      9    4     550   2     31    6    1050   4
WELLS GRAY   P.G.     62    4    1550  13     50    6    1900  13
FT NLSN      F.N.      9   -2     400  10      9   -2     400  10
FT STJOHN    F.N.      9   -2     700   9      9   -3     700   9


*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            SE  20   SE  30
SMITHERS              E   30   E   30

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR OVER ALL AREAS
EXCEPT NORTHEAST BC AND THE BULKLEY VALLEY THIS AFTERNOON.

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     82   10     650  20    100   12    1350  20
FRASER VLY   QUIL     43    9     250  20    100   11     950  20
SRN VRISL    QUIL     24   11     800   2     35   13    1450   2
CNTRL VRISL  QUIL     18   10     500   2     30   12    1200   2
NRN VRISL    HRDY      9    8       0   3     26   10     550   4
TERRACE      ANT      10    5     250  19     10    7     250  19
STEWART      ANT       9    6       0  10      9    7       0  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
VANCOUVER    W   19   W   19   W   15
PORT HARDY   S   15   S   17   S   19
SANDSPIT     SE  33   SE  31   E   28

TODAY'S VENTING: POOR OVER THE NORTHERN COAST RISING TO GOOD OVER
SOUTHERN SECTIONS.


VENTING FOR FRIDAY: FAIR

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

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