FPCN39 CWLW 071400
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 PDT WEDNESDAY 7 JULY 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   KEL      16   18     550   2    100   22   4000   30
KAMLOOPS     KEL      41   18     950   6    100   23   4000   20
OKANAGAN     KEL      41   18     950   6    100   23   4000   15
CASTLEGAR    SPOK     63   17    1150  11    100   25   4000   12
CRANBROOK    SPOK     55   16    1500  10    100   24   4000   20
REVELSTOKE   KEL      10   17     500   2    100   19   4000   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
PENTICTON    W   17   W   37   W   54
CRANBROOK             W   22   W   57

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: 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.      9   15    1000   0    100   19    4000  12
PR. GEORGE   P.G.      9   15     700   0    100   20    4000  11
SMITHERS     P.G.      9   16     600   0    100   22    4000   9
WELLS GRAY   P.G.      9   14    1100   0    100   19    4000  12
FT NLSN      F.N.      9   18     500   1     25   24     750   5
FT STJOHN    F.N.      9   17     800   0     45   23    1100  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  24   NW  22
SMITHERS              NW  17   NW  22

TODAY'S VENTING: GOOD SOUTH TO POOR NORTH.


VENTING FOR THURSDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   17    1850  14    100   19    1850  14
FRASER VLY   QUIL    100   17    1800  15    100   19    1800  15
SRN VRISL    QUIL    100   17    1950  13    100   20    1950  13
CNTRL VRISL  QUIL    100   16    2050  13    100   21    2050  13
NRN VRISL    HRDY     79   14     900  12     79   16     900  12
TERRACE      ANT       9   16     300   0     58   24    2400   3
STEWART      ANT       9   16     100   0     44   24    1350   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
VANCOUVER    SW  35   W   43   W   50
PORT HARDY   W   24   W   30   W   35
SANDSPIT     W   19   W   11   W   11

TODAY'S VENTING: GOOD SOUTH TO POOR NORTH.

VENTING FOR THURSDAY: FAIR.

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

END/MWSO
$$$$^^