FPCN39 CWLW 281424
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 SATURDAY 28 FEBRUARY 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      19    0     500   3     35    3     700   6

KAMLOOPS     KEL      16    0     550   3     41    3     900   6

OKANAGAN     KEL      16    0     550   3     40    3     900   6

CASTLEGAR    SPOK     20    0     850   3     28    4    1150   3

CRANBROOK    SPOK     20    0     850   3     28    3    1150   3

REVELSTOKE   KEL      13   -1     550   3     46    3    1100   7


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   20   SW  39
CRANBROOK             VR   5   S   17

TODAY'S VENTING: FAIR

VENTING FOR SUNDAY: 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.      9   -2     950  12     60    2    3950  12

PR. GEORGE   P.G.     21   -3     850   7     58    2    1750  12

SMITHERS     P.G.     12   -5     650   2     32    1     900   6

WELLS GRAY   P.G.     10   -4    1000  12     60    2    4000  12

FT NLSN      F.N.      9   -8     400  13     50   -1     900  13

FT STJOHN    F.N.      9   -7     700  12     22   -3     800  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  33   S   35
SMITHERS              SE  31   S   35

TODAY'S VENTING: GOOD IN THE CENTRAL INTERIOR. POOR IN THE PEACE AND
THE NORTHWEST.

VENTING FOR SUNDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     28    5     250  12     78    7     800  14

FRASER VLY   QUIL     26    5     200  12     73    7     750  12

SRN VRISL    QUIL     80    7     650  18     77    8     850  15

CNTRL VRISL  QUIL     22    5     200   9     71    6     900  14

NRN VRISL    HRDY    100    5     700  29     90    7    1050  21

TERRACE      ANT      11    1     250  36     31    2     350  26

STEWART      ANT       9    2       0  15     29    2      50  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   26   SW  35   SW  44
PORT HARDY   S   20   SW  28   SW  35
SANDSPIT     S   33   S   33   S   35

TODAY'S VENTING: GOOD EXCEPT POOR IN THE NORTH.

VENTING FOR SUNDAY: GOOD

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

END/PJS