FPCN39 CWLW 191340
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 19 MARCH 1999 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     30    8     750   4     35   13     900   4
KAMLOOPS     SPOK     25    7     750   4     32   12     900   4
OKANAGAN     SPOK      9    5     350   4     29   11     900   4
CASTLEGAR    SPOK     19    6     750   4     29   12    1000   4
CRANBROOK    SPOK      9    3     950   4     18   10    1150   4
REVELSTOKE   SPOK      9    4     450   4     23    8     800   4

*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   VR   5   W   24
CRANBROOK             W   11   W   30

TODAY'S VENTING: POOR LOCALLY FAIR.

VENTING FOR SATURDAY: POOR

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.     58    3    1950   6    100    9    3950   8
PR. GEORGE   P.G.     13    0     800   3    100    8    3700   8
SMITHERS     P.G.     14    0     800   2     56    7    1900   4
WELLS GRAY   P.G.     29    2    1350   6    100    9    4000   8
FT NLSN      F.N.      9    0     400   0     73    5    2000   6
FT STJOHN    F.N.      9    0     700   7    100    5    3700   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   26   SW  24
SMITHERS              S   35   S   24

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: POOR TO FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     16    9     250   4     18   11     350   4
FRASER VLY   QUIL     17    9     250   4     38   15     950   4
SRN VRISL    QUIL     16    7     200   5     22   12     350   4
CNTRL VRISL  QUIL     17    8     200   5     21   12     350   4
NRN VRISL    HRDY     27    5     300   7     63   10     700  10
TERRACE      ANT      10    3     220  10     81    6    1250  11
STEWART      ANT      10    3      20  10     59    6     600  11

*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    VR   5   S   13   SW  30
PORT HARDY   S   24   S   46   S   54
SANDSPIT     S   54   S   70   S   72

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

VENTING FOR SATURDAY: POOR

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


END/MWSO