FPCN39 CWLW 111334
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 WEDNESDAY 11 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      38    8     950  12     55   11    1650  10
KAMLOOPS     KEL      14    8     800   1     56   10    1700   8
OKANAGAN     KEL       9    6     550   0     53   10    1600   5
CASTLEGAR    SPOK     19    6     850   3     33    9    1350   3
CRANBROOK    SPOK      9    4     950   5     52    7    1650   7
REVELSTOKE   KEL       9    4     500   0     30    5     550   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   W   28
CRANBROOK             W   11   W   35

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR THURSDAY: GOOD


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.     22    3    1050   7     62    8    1450  13
PR. GEORGE   P.G.     59    5    1200   5     52    7    1450   8
SMITHERS     P.G.      9    1     500   4     39    6     900   9
WELLS GRAY   P.G.     28    4    1350   8     55    6    2550  12
FT NLSN      F.N.     18   -7     600   4     28   -2     800   4
FT STJOHN    F.N.     23   -3     950   6     50    4    1200  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   26   W   43
SMITHERS              SW  24   SW  43

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR THURSDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    9     100   8     55   11     600  13
FRASER VLY   QUIL     43   10     350   6     55   13     950  10
SRN VRISL    QUIL      9    9     200   6     58   12     700  14
CNTRL VRISL  QUIL      9    9     200   6     35   10     600   9
NRN VRISL    HRDY      9    9     200   8     33   10     500  12
TERRACE      ANT       9    0     200   8     35    2     500  12
STEWART      ANT       9    5     200   8     33    2     500   8

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  19   S   26   SW  30
PORT HARDY   SE  37   S   48   S   41
SANDSPIT     S   44   S   43   S   35

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR THURSDAY: GOOD




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


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