FPCN39 CWLW 081433
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 Friday 8 August 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      40   18    1300   6    100   26    3200  15
KAMLOOPS     KEL      40   16    2200   8    100   26    3350  15
OKANAGAN     KEL      38   19    1200   4    100   27    3350  15
CASTLEGAR    SPOK     19   19     800   4    100   25    2350  15
CRANBROOK    SPOK     10   11     950  20    100   23    3950  20
REVELSTOKE   KEL      12   12     550   2    100   21    2450  13

*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    NW   9   N   19   N   24
CRANBROOK             NW   9   NW  22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2400 m         15 C
SPOKANE         1000 m         17 C

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.    100   12    3950   5    100   22    3950  21
PR. GEORGE   P.G.    100   11    1950   5    100   19    3700  20
SMITHERS     P.G.     82   12    1250   7    100   19    3500  19
WELLS GRAY   P.G.    100   10    4000  10    100   22    4000  21
FT NLSN      F.N.     38   10     750   9    100   18    2400  13
FT STJOHN    F.N.     28   12     900  11    100   15    2400  13

*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            N   26   N   39
SMITHERS              NW  13   N   39

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2500 m         12 C
FT. NELSON       800 m         14 C

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     70   16     650   5    100   23    1050  22
FRASER VLY   QUIL     65   20     750  10    100   25    1300  21
SRN VRISL    QUIL      9   17     650   0     90   23    1000  14
CNTRL VRISL  QUIL      9   20     750   0    100   25    1250  16
NRN VRISL    HRDY    100   17     800  15    100   20    1350  24
TERRACE      ANT      70   13    1500  10    100   23    1900  19
STEWART      ANT      45    9    1200  10    100   23    1700  16

*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    NW   9   N   11   NE  22
PORT HARDY   N   33   N   28   N   35
SANDSPIT     NW  39   N   35   N   35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1000 m         17 C
PORT HARDY      1800 m         15 C
ANNETTE         1500 m         16 C

TODAY'S VENTING: GOOD




VENTING FOR SATURDAY: GOOD




VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR




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

END/AMK