FPCN39 CWLW 281400
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 FRIDAY 28 MAY 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      13   15     550   1    100   21    3200   8
KAMLOOPS     KEL      85   16    2050   7    100   21    3350   8
OKANAGAN     KEL      30   15     900   4    100   23    3350   8
CASTLEGAR    SPOK     34   16     750  10     80   20    1850  10
CRANBROOK    SPOK     10   13     950  11     80   17    1950  11
REVELSTOKE   KEL      97   16    2550   8    100   19    3450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   NW  20   NW  24
CRANBROOK             VR   5   W   15

TODAY'S VENTING: BECOMING GOOD BY THE AFTERNOON.

VENTING FOR SATURDAY: 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    7    3950   5    100   14    3950  10
PR. GEORGE   P.G.    100    8    2300   5    100   13    3700  11
SMITHERS     P.G.     30    6     800   8    100   12    3500  10
WELLS GRAY   P.G.     60    2    1000   5    100   14    4000  10
FT NLSN      F.N.    100   10    1550   8    100   14    2750  15
FT STJOHN    F.N.    100    9    2150  20    100   14    3700  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   30   W   33
SMITHERS              W   28   W   33

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     79   13     950  12     95   16    1300  13
FRASER VLY   QUIL     80   13     950  12    100   18    1600  13
SRN VRISL    QUIL     70   11     900  10     85   16    1200  11
CNTRL VRISL  QUIL     70   12     900  10     93   17    1350  11
NRN VRISL    HRDY     31    9     800   3     68   13    1700   5
TERRACE      ANT     100    9    3200  11    100   13    3200  11
STEWART      ANT      76    9     950  10    100   13    3000  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   24   NW  26   NW  28
PORT HARDY   NW  26   NW  26   NW  37
SANDSPIT     W   19   W   22   W   37

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD


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


END/
$$$$^^