FPCN39 CWLW 171352
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 17 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   SPOK     39    6     750   6     80   11    1500   8
KAMLOOPS     SPOK     67    9    1300   8    100   12    2500  10
OKANAGAN     SPOK     39    8     850   7    100   12    2500  10
CASTLEGAR    SPOK     27    5     800   7     90    9    1950  10
CRANBROOK    SPOK     58    4    1650   9    100    8    3950  11
REVELSTOKE   SPOK     31    6     800   7     79    9    1750   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   NE  19   E   31
CRANBROOK             NE  19   NE  54

TODAY'S VENTING: FAIR BECOMING GOOD BY AFTERNOON.

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.      9    1     950  10     42    6    1350   10
PR. GEORGE   P.G.      9    0     700   5     55    6    1450   7
SMITHERS     P.G.     11   -1     650   2     31    4    1050   5
WELLS GRAY   P.G.      9    1    1000  10     64    7    2500   6
FT NLSN      F.N.      9    1     400   1     58    8    2150   4
FT STJOHN    F.N.      9    1     700   0     17    4    1550   1

*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            VR   5   VR   5
SMITHERS              SE  19   S    5

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     22    7     250   8     88   13    1800   8
FRASER VLY   QUIL     34    8     400   8     87   13    1750   8
SRN VRISL    QUIL     15    7     250   3     80   13    1650   7
CNTRL VRISL  QUIL     15    7     250   3     71   12    1450   6
NRN VRISL    HRDY     26    7     550   4     58   10    1050   8
TERRACE      ANT       9    3     250   6     80    7    1300  10
STEWART      ANT      11    5     200   1     40    7     750   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    N   13   NE  19   NE  19
PORT HARDY   VR   5   SE   9   NW   9
SANDSPIT     S   44   S   44   S   41

TODAY'S VENTING: 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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