FPCN39 CWLW 181411
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 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    7     600   0     53   14    3200   2
KAMLOOPS     KEL      12    6     650   1     53   13    3350   2
OKANAGAN     KEL      12    6     650   1     53   13    3350   2
CASTLEGAR    SPOK     21    5     800   4     76   12    2500   5
CRANBROOK    SPOK     10    3     950   4     94   10    3950   5
REVELSTOKE   KEL       9    3     550   0     20    8    1100   2

*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   VR   5   VR   5
CRANBROOK             VR   5   NW   9

TODAY'S VENTING: FAIR TO GOOD EXCEPT POOR IN THE REVELSTOKE AREA.

VENTING FOR THURSDAY: 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    4     950   5    100   10    3950   7
PR. GEORGE   P.G.     17    4     850   5     85    9    2450   7
SMITHERS     P.G.     12    3     800   1     35    7    1000   6
WELLS GRAY   P.G.      9    3    1000   5    100    9    4000   7
FT NLSN      F.N.      9    0     400   4     34    7     850   6
FT STJOHN    F.N.      9    0     700   8     39    5    1150   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
PR. GEORGE            SW  11   W   20
SMITHERS              SW  20   SW  20

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR THURSDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     18    8     300   4     39   12     950   4
FRASER VLY   QUIL     18    8     300   4     46   13    1150   4
SRN VRISL    QUIL      9    8     250   4     37   12     800   4
CNTRL VRISL  QUIL      9    8     250   4     30   10     600   4
NRN VRISL    HRDY      9    7      50   8     33    9     300   9
TERRACE      ANT      15    5     250  18     96    8    1100  18
STEWART      ANT      47    6     250  18     88    8     750  18

*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    E   13   S   11   SW  19
PORT HARDY   SE  15   S   17   VR   5
SANDSPIT     S   17   S   19   SW   9

TODAY'S VENTING: GOOD NORTH BECOMING FAIR TO POOR SOUTH.

VENTING FOR THURSDAY: FAIR TO POOR

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


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