FPCN39 CWLW 091432
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Wednesday 9 July 1997 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   19     200   0     66   23    1750   5
KAMLOOPS     KEL       9   18     350   0    100   23    3350  10
OKANAGAN     KEL      21   19     850   2    100   23    3350  10
CASTLEGAR    SPOK     38   17     750  13    100   21    3500  24
CRANBROOK    SPOK    100   18    3950  28    100   21    3950  28
REVELSTOKE   KEL       9   15     450   0    100   19    3350  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
PENTICTON    VR   5   SW  13   SW  17
CRANBROOK             SW   9   SW  24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m         17 C
SPOKANE          none

TODAY'S VENTING: good.

VENTING FOR THURSDAY: good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: gradually decreasing to 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.    100   14    2550  12    100   20    3950  10
PR. GEORGE   P.G.     78   14    1550  12    100   18    2850  11
SMITHERS     P.G.     19   12     700   7    100   18    2550  11
WELLS GRAY   P.G.    100   15    2850  11    100   20    4000  10
FT NLSN      F.N.      9   12     400   5      9   15     400   5
FT STJOHN    F.N.      9   16     700   6     83   21    2900   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   15   W   17
SMITHERS              W   19   NW  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       900 m         13 C
FT. NELSON      1200 m         20 C

TODAY'S VENTING: genearally good.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: good in general.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     58   15     650  11    100   19    1600  15
FRASER VLY   QUIL     87   17    1100  13    100   20    1800  15
SRN VRISL    QUIL     51   16     750   7     98   19    1450  12
CNTRL VRISL  QUIL     76   17    1000  10    100   20    1750  13
NRN VRISL    HRDY     52   14     650   8    100   18    1750  11
TERRACE      ANT      74   14    1350   9     97   18    2100   9
STEWART      ANT      45   14     750   6     86   18    1800   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   SW  20   SW  24
PORT HARDY   SW  11   VR   5   VR   5
SANDSPIT     N   17   N   20   N   26

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       none
PORT HARDY       200 m         13 C
ANNETTE          missing

TODAY'S VENTING: good.

VENTING FOR THURSDAY: GOOD

VENTING OUTLOOK FRIDAY THRU SUNDAY: gradually decreasing to fair.


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

END/dsl