FPCN39 CWLW 211400
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 21 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      17   10     600   2     54   16    1400   5
KAMLOOPS     KEL      13    9     650   2     63   15    1600   6
OKANAGAN     KEL      13    9     650   2     54   14    1500   5
CASTLEGAR    SPOK     19    8     750   4     35   12    1100   4
CRANBROOK    SPOK      9    6     950   4     34   10    1250   4
REVELSTOKE   KEL      11    7     550   2     31   11     850   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   S   13   S   22
CRANBROOK             VR   5   W   22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1000 M         12 C
SPOKANE         1000 M         12 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY:

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.     37    6    1300   9    100   12    3950   7
PR. GEORGE   P.G.     29    7    1150   5     85   12    2750   6
SMITHERS     P.G.     11    4     600   2     41   10    1250   5
WELLS GRAY   P.G.     59    7    2300   5    100   12    4000   7
FT NLSN      F.N.      9    0     400   5     46    8     750   5
FT STJOHN    F.N.      9    1     700   5     50    6    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
PR. GEORGE            E   19   E    9
SMITHERS              E   37   SE   9

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1800 M         10 C
FT. NELSON       700 M          7 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY:

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     10   11     100   5     86   13     900  14
FRASER VLY   QUIL     88   13     850   5     77   15    1050  12
SRN VRISL    QUIL      9   10       0   6     74   13     800  14
CNTRL VRISL  QUIL      9    9      50   6     60   12     650  10
NRN VRISL    HRDY     25   10     150  13     39   12     300  16
TERRACE      ANT       9    8     200  11     37   11     500  11
STEWART      ANT      12   10     150   2     13   11     200   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    SE  31   S   48   S   61
PORT HARDY   SE  57   SE  72   SE  80
SANDSPIT     SE  61   SE  63   SE  61

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       900 M         13 C
PORT HARDY       700 M         14 C
ANNETTE          MSG           MSG

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR SUNDAY: FAIR

VENTING OUTLOOK MONDAY THRU 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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