FPCN39 CWLW 011420
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 SUNDAY 1 MARCH 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    2     200   2     22    5     850   2
KAMLOOPS     KEL      22    4    1000   2     33    7    1650   2
OKANAGAN     KEL      12    2     500   2     22    4    1000   2
CASTLEGAR    SPOK     18    2     750   4     30    4     900   6
CRANBROOK    SPOK     10   -2     950  10     10    2     950  10
REVELSTOKE   KEL      15    2     750   2     20    3    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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW   9   W   19
CRANBROOK             VR   5   W   22

TODAY'S VENTING: POOR

VENTING FOR MONDAY: 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.     40    1    1550   9     60    3    2100  16
PR. GEORGE   P.G.      9   -2     700   3     40    2    1100   6
SMITHERS     P.G.     11   -2     650   2     12    0     700   2
WELLS GRAY   P.G.     10    0    1000   9     60    4    2450  13
FT NLSN      F.N.     20   -6     850   5     32   -5     850   5
FT STJOHN    F.N.     42   -6     900   8     30   -3    1050   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   20   SW  26
SMITHERS              S   28   S   26

TODAY'S VENTING: POOR IN THE VALLEYS GOOD AT HIGHER ELEVATIONS.

VENTING FOR MONDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100   6     28    9     350   8
FRASER VLY   QUIL      9    6      50   6     19    8     350   6
SRN VRISL    QUIL      9    8       0   3     41   10     600   6
CNTRL VRISL  QUIL      9    6      50   3     19    6     350   3
NRN VRISL    HRDY      9    5       0   4     57    8     700   9
TERRACE      ANT      10    2     250  25     10    3     250  15
STEWART      ANT       9    2       0  15      9    3       0  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   20   SW  28   SW  31
PORT HARDY   SW  24   SW  30   SW  41
SANDSPIT     S   43   S   43   S   41

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

VENTING FOR MONDAY: FAIR

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


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