FPCN39 CWLW 101345
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 TUESDAY 10 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      21    4     750   4     44   10    1450  10
KAMLOOPS     KEL      26    5     900   3     50    9    1700  10
OKANAGAN     KEL      22    3     550   7     38    7    1250   7
CASTLEGAR    SPOK     22    3     850   4     26    5     950   4
CRANBROOK    SPOK      9    1     950  11     44    4    1300  11
REVELSTOKE   KEL      15    2     550   7     23    4     900   3

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   30   SW  59
CRANBROOK             VR   5   SW  24

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: 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.     23   -6    1400   5     52    3    1900  10
PR. GEORGE   P.G.     30   -7    1050   4     50   -2    1350   8
SMITHERS     P.G.     41   -3    1250   5     45    0    1350   5
WELLS GRAY   P.G.     29   -5    1500   5     56    2    1850   9
FT NLSN      F.N.     19  -12    1000   5     46  -10    1450   5
FT STJOHN    F.N.     27  -12    1450  11     56   -8    1550  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   48   S   50
SMITHERS              SE  41   S   50

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21    6     300   7     65   10     750  19
FRASER VLY   QUIL      9    7     200  13     45    9     400  10
SRN VRISL    QUIL     34    9     300  14     71   11     850  17
CNTRL VRISL  QUIL     15    8     150   6     42    9     500  14
NRN VRISL    HRDY     54    9     550  17     70   10     650  15
TERRACE      ANT      22    0     300  16     30    2     500  16
STEWART      ANT      24    2     200  10     32    2     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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   50   S   56   SW  57
PORT HARDY   S   50   SW  56   SW  59
SANDSPIT     SW  54   SW  56   SW  59

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: FAIR




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


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