FPCN39 CWLW 081449
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 8 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    1     200   5     27    4     550   5
KAMLOOPS     KEL      13    2     550   8     35    4     700   8
OKANAGAN     KEL       9    0     350   5     26    3     600   7
CASTLEGAR    SPOK     29    1     750   8     34    2     850   9
CRANBROOK    SPOK     10   -1     950  12     10    0     950  12
REVELSTOKE   KEL      11    1     550   4     18    2     600   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   41
CRANBROOK             VR   5   SW  30

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.     57   -4    1500  11     66   -2    1800   9
PR. GEORGE   P.G.     72   -9    1200  12     76   -7    1300  12
SMITHERS     P.G.     76   -6    1300  12     76   -4    1350  12
WELLS GRAY   P.G.     57   -6    1550  11     73   -3    1850  11
FT NLSN      F.N.     33  -21     500  20     88  -14    1250  15
FT STJOHN    F.N.     25  -20     800  16     78  -15    1550  12

*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            E   13   W   20
SMITHERS              SE  19   SW  20

TODAY'S VENTING: GOOD

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     85    7     700  21    100   10    1150  24
FRASER VLY   QUIL     64    6     500  17    100    9     950  24
SRN VRISL    QUIL     98    9     900  19    100   10    1050  20
CNTRL VRISL  QUIL      9    5      50   4     63    7     600  13
NRN VRISL    HRDY     83    7     700  18    100    9    1150  17
TERRACE      ANT       9    0     250   8     48    4     800   8
STEWART      ANT      41    2     200  10     50    4     500  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   SW  30   W   31
PORT HARDY   S   31   SW  35   SW  35
SANDSPIT     SE  43   S   37   S   33

TODAY'S VENTING: GOOD SOUTH TO FAIR NORTH

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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