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 MONDAY 28 JUNE 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      ##   ##     ###  ##     65   18    1000  15
KAMLOOPS     KEL      21   15     750   3     50   15    1200   8
OKANAGAN     KEL      ##   ##     ###  ##     50   16    1600   8
CASTLEGAR    SPOK     ##   ##     ###  ##     45   17    1300   5
CRANBROOK    SPOK      9   13     950  18    100   17    2500  15
REVELSTOKE   KEL      15   13     650   3     40   14    1200   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   24   W   46
CRANBROOK             W   15   W   41

TODAY'S VENTING: FAIR TO 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.     ##   ##     ###  ##     45   12    1500   3
PR. GEORGE   P.G.     90   12    2150  10     50   11    1500   5
SMITHERS     P.G.     ##   ##     ###  ##     85   14    2200   8
WELLS GRAY   P.G.     ##   ##     ###  ##     35    8    1800   5
FT NLSN      F.N.     21   17     650   5    100   23    3400   8
FT STJOHN    F.N.      9   13     700  12    100   18    1950  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            SW  22   W   48
SMITHERS              SW  33   SW  48

TODAY'S VENTING:

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     ##   ##     ###  ##     90   17    1500  10
FRASER VLY   QUIL     ##   ##     ###  ##     90   17    1450  10
SRN VRISL    QUIL     ##   ##     ###  ##    100   18    1550  10
CNTRL VRISL  QUIL     ##   ##     ###  ##    100   18    1550  10
NRN VRISL    HRDY     ##   ##     ###  ##     90   15    1450  10
TERRACE      ANT      ##   ##     ###  ##    100   16    1750  20
STEWART      ANT      ##   ##     ###  ##    100   16    1450  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    S   19   SW  39   W   46
PORT HARDY   S   30   SW  39   SW  50
SANDSPIT     S   46   SW  57   SW  67

TODAY'S VENTING:

VENTING FOR TUESDAY: GOOD


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

END/kj
$$$$^^