FPCN39 CWLW 131434
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 FRIDAY 13 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    8     200   0     40   11     500  15
KAMLOOPS     KEL       9    6     350   0     34   10     500  12
OKANAGAN     KEL       9    7     350   0      9   10     500   0
CASTLEGAR    SPOK      9    6     500  15      9    9     500  15
CRANBROOK    SPOK      9    4     950  10      9    7     950  10
REVELSTOKE   KEL       9    6     450   0      9    8     450   0


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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  15   W   43   W   93
CRANBROOK             W   31   W   93

TODAY'S VENTING: POOR EXCEPT IMPROVING TO FAIR AT KAMLOOPS AND OVER
THE FRASER CANYON.

VENTING FOR SATURDAY: 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.     15    3    1700   4     92    5    2200  12
PR. GEORGE   P.G.      9    1     700   1     41    3    1150   8
SMITHERS     P.G.      9    0     500   1     12    3     850   1
WELLS GRAY   P.G.     73    2    1650  15     95    5    2350  12
FT NLSN      F.N.      9  -13     400   8     10  -11     400   8
FT STJOHN    F.N.     15   -7     800   2     20   -5     850   5

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  20   NW  22
SMITHERS              VR   5   NW  22

TODAY'S VENTING: POOR EXCEPT INCREASING TO FAIR THIS AFTERNOON AT
PRINCE GEORGE AND GOOD AT WILLIAMS LAKE AND WELLS GRAY.

VENTING FOR SATURDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   11     100  22      9   12     100  22
FRASER VLY   QUIL      9   10      50  22      9   12      50  22
SRN VRISL    QUIL      9   11       0  20      9   12       0  20
CNTRL VRISL  QUIL      9   11      50  20      9   12      50  20
NRN VRISL    HRDY     26    8     200  10     40   11     900  12
TERRACE      ANT       9    1     200  12     10    4     250  12
STEWART      ANT      21    5     200   6     13    4      50   6

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  33   W   50   W   65
PORT HARDY   NW  11   NW  17   W   33
SANDSPIT     N   20   N   13   N    9

TODAY'S VENTING: POOR EXCEPT INCREASING TO FAIR OVER NORTHERN
VANCOUVER ISLAND.

VENTING FOR SATURDAY: POOR

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


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