FPCN39 CWLW 191423
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 THURSDAY 19 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   2     57   16    2850   3
KAMLOOPS     KEL      12    6     650   2     64   15    2800   3
OKANAGAN     KEL      12    6     650   2     64   15    2800   3
CASTLEGAR    SPOK     21    5     800   2     58   13    2600   3
CRANBROOK    SPOK     10    3     950   2     54   11    2800   3
REVELSTOKE   KEL       9    3     550   2     58   11    2500   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    VR   2   SW   5   SW  13
CRANBROOK             VR   2   NW  13

TODAY'S VENTING:  GOOD LOCALLY FAIR

VENTING FOR FRIDAY: 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   2     71   10    2700   5
PR. GEORGE   P.G.      9    4     850   2     54   10    1800   5
SMITHERS     P.G.      9    3     800   2     46    9    1400   5
WELLS GRAY   P.G.      9    3    1000   2     70    7    2700   5
FT NLSN      F.N.      9    0     400   5     35    7     850   6
FT STJOHN    F.N.      9    0     700   4     32    8    1000   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            VR   2   NW   11
SMITHERS              SE  13   VR    2

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

VENTING FOR FRIDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL      9    8     100   3     31   14     550   5
FRASER VLY   QUIL      9    8     100   3     32   14     550   5
SRN VRISL    QUIL      9    8     100   3     31   13     500   5
CNTRL VRISL  QUIL      9    8      50   3     22   11     300   5
NRN VRISL    HRDY      9    7      50   5     49   11     500  10
TERRACE      ANT       9    5     220   8     34   11     450  12
STEWART      ANT       9    6      30   8     49    9     400  12

*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   11   S   11   SW  19
PORT HARDY   SE  22   S   22   SW  30
SANDSPIT     SE  43   SE  32   S   26

TODAY'S VENTING: POOR TO FAIR

VENTING FOR FRIDAY: POOR

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

END/MWSO