FPCN39 CWLW 181423
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 18 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      16    4     500   2     27    7     750   3
KAMLOOPS     KEL      20    5     700   3     26    7     850   3
OKANAGAN     KEL      12    2     500   2     26    7     850   3
CASTLEGAR    SPOK     16    3     750   3     21    6     850   4
CRANBROOK    SPOK      9    1     950  21     50    6     900   5
REVELSTOKE   KEL      10    1     500   2     17    4     700   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    S   13   S   26   S   37
CRANBROOK             SW  13   SW  43

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: POOR

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.     10    2     950  25    100    4    1600  31
PR. GEORGE   P.G.      9    1     700   7     90    5    1450  19
SMITHERS     P.G.     11    0     650   2     12    2     700   2
WELLS GRAY   P.G.     85    2    1450  28    100    5    1800  31
FT NLSN      F.N.     24  -11     900   3     35  -10    1100   4
FT STJOHN    F.N.     30   -8    1150   5     32   -4    1200   5

*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            S   44   SW  44
SMITHERS              S   39   S   44

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    9     850  41    100   11    1250  43
FRASER VLY   QUIL      9    7      50  39    100   10    1100  42
SRN VRISL    QUIL    100   10    1050  36    100   11    1150  36
CNTRL VRISL  QUIL     33    8     300  10     33    8     300  10
NRN VRISL    HRDY      9    7       0  27     50    8     200  27
TERRACE      ANT       9    4     200  21     10    5     200  21
STEWART      ANT       9    6       0  16      9    5       0  16

*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  48   S   56   S   54
PORT HARDY   SE  39   SE  48   S   54
SANDSPIT     S   59   S   65   S   67

TODAY'S VENTING: GOOD IN THE SOUTH POOR IN THE NORTH

VENTING FOR THURSDAY: POOR

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


END/PJS