FPCN39 CWLW 201350
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 FRIDAY 20 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      14    9     700   1     91   15    2200   7
KAMLOOPS     KEL      17    9     800   2     87   15    2200   7
OKANAGAN     KEL      17    9     800   2     87   15    2200   7
CASTLEGAR    SPOK     23    7     800   5     63   13    1950   5
CRANBROOK    SPOK      9    4     950   3     58   11    2200   5
REVELSTOKE   KEL       9    5     600   2     42   10    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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   SW  11   W   22
CRANBROOK             VR   5   W   19

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR SATURDAY: FAIR TO GOOD

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.     30    6    1200   9     93   11    2800   8
PR. GEORGE   P.G.      9    4     700  10     60   10    1500   8
SMITHERS     P.G.     10    4     650   1     48    9    1100   8
WELLS GRAY   P.G.     41    6    1400   9     92    8    2800   8
FT NLSN      F.N.      9    1     400   2     78    7    1700   8
FT STJOHN    F.N.     35    2    1200   5     87    6    2050  10

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE            NE   9   VR   5
SMITHERS              E   22   SE   5

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR SATURDAY: FAIR TO GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     15   10     200   6     21   14     300   6
FRASER VLY   QUIL     19   12     250   6     51   16     750   7
SRN VRISL    QUIL     16    9     150   6     23   14     300   6
CNTRL VRISL  QUIL     15    9     150   6     20   12     250   6
NRN VRISL    HRDY      9    9       0   5     30   11     350   8
TERRACE      ANT       9    7     200   6     57   11     900   9
STEWART      ANT      12    9     100   3     56   11     700   9

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    SE  11   S   15   SW  22
PORT HARDY   SE  19   S   30   S   28
SANDSPIT     SE  30   SE  30   SE  24

TODAY'S VENTING: POOR LOCALLY FAIR SOUTH BECOMING GOOD NORTH

VENTING FOR SATURDAY: POOR TO FAIR

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


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