FPCN39 CWLW 291400
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 SUNDAY 29 AUGUST 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      50   19     200  15    100   29    1300  15
KAMLOOPS     KEL       9   18     350   2     78   28    1500   8
OKANAGAN     KEL       9   18     350   2     70   27    1200   8
CASTLEGAR    SPOK     19   18     750   4     60   27     900   8
CRANBROOK    SPOK      9   20     950   8    100   30    3950  13
REVELSTOKE   KEL       9   17     450   2     62   25     950   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   SW  24   SW  48
CRANBROOK             SW  15   SW  31

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: 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.     78   16    2500   7    100   20    3950   9
PR. GEORGE   P.G.     67   16    1850   7     82   18    2450   7
SMITHERS     P.G.     53   16    1600   5     80   16    1600   9
WELLS GRAY   P.G.     78   16    2500   7    100   20    4000   9
FT NLSN      F.N.      9   13     400   2     16   17     750   2
FT STJOHN    F.N.     18   15     850   6    100   18    3700  14

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   11   S   52
SMITHERS              N    9   N   52

TODAY'S VENTING: GOOD LOCALLY POOR IN THE NORTHEAST

VENTING FOR MONDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     89   16     950  16    100   19    1600  15
FRASER VLY   QUIL     90   16     950  16    100   20    1650  15
SRN VRISL    QUIL     85   17     950  13    100   20    1650  13
CNTRL VRISL  QUIL     85   17     950  13    100   20    1650  13
NRN VRISL    HRDY     40   15    1150   3     40   15    1150   3
TERRACE      ANT     100   16    2300  11    100   16    2300  11
STEWART      ANT     100   16    2150  10    100   16    2150  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   26   SW  33   SW  50
PORT HARDY   NW  30   NW  30   NW  22
SANDSPIT     W   19   NW  20   W   15

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR MONDAY: FAIR

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

END/MWSO
$$$$^^