FPCN39 CWLW 271331
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 MONDAY 27 JULY 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   28     600   0     95   40    3200   5
KAMLOOPS     KEL       9   24     500   0     95   39    3350   5
OKANAGAN     KEL       9   26     550   0     95   39    3350   5
CASTLEGAR    SPOK     17   27     750   3    100   38    3500   7
CRANBROOK    SPOK      9   23     950   9    100   36    3950   8
REVELSTOKE   KEL       9   25     550   0     95   38    3450   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW   9   N    9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: 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.     10   20     950  16    100   33    3950   5
PR. GEORGE   P.G.     10   20     800   1    100   31    3700   5
SMITHERS     P.G.     12   19     800   1    100   30    3500   8
WELLS GRAY   P.G.     10   20    1000  16    100   32    4000  10
FT NLSN      F.N.      9   17     400  20    100   26    3400  15
FT STJOHN    F.N.      9   18     700  20    100   29    3700  15

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              NW  11   W

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12   22     250   2     21   27     450   4
FRASER VLY   QUIL     19   25     350   4     50   35    1250   4
SRN VRISL    QUIL      9   20     150   0     19   28     450   2
CNTRL VRISL  QUIL     17   26     400   2     60   37    1700   5
NRN VRISL    HRDY      9   17       0   5     23   23     300   5
TERRACE      ANT      73   21     600  25    100   34    2700  21
STEWART      ANT      76   23     600  17    100   34    2300  20

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   W   11
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     N   39   N   26   NW  24

TODAY'S VENTING: GOOD INLAND NORTH COAST. FAIR TO POOR ELSEWHERE.

VENTING FOR TUESDAY: POOR.

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


END/KJ