FPCN39 CWLW 231317
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 SATURDAY 23 MAY 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      26   17     500   6     77   21    1400   8
KAMLOOPS     KEL      ##   ##     ###  ##     82   23    2050   7
OKANAGAN     KEL      63   18    1100   9     80   22    1950   7
CASTLEGAR    SPOK     ##   ##     ###  ##     86   19    2100   8
CRANBROOK    SPOK     ##   ##     ###  ##     75   16    2350   7
REVELSTOKE   KEL      63   18    1300   8     82   23    2200   7

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W   11
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         300  m         14 C
SPOKANE         600  m         15 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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   23    3950   9
PR. GEORGE   P.G.     29   14    1000   8     70   21    1600  10
SMITHERS     P.G.     16   14     750   4     43   20    1200   6
WELLS GRAY   P.G.     21   14    1100  13    100   23    4000   9
FT NLSN      F.N.     80   16    1050  16     95   22    1650  12
FT STJOHN    F.N.     ##   ##     ###  ##     80   19    1650  11

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   13   S   19
SMITHERS              S   19   S   19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE     700  m          20 C
FT. NELSON     1500 m          21 C

TODAY'S VENTING:GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY:GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     93   15     950  17    100   18    3100  17
FRASER VLY   QUIL     90   15     900  16    100   18    3050  17
SRN VRISL    QUIL     66   14     650  13    100   17    1250  15
CNTRL VRISL  QUIL     81   15     850  14    100   17    1300  15
NRN VRISL    HRDY     36   14     400   8     98   16    1250  13
TERRACE      ANT      70   11     850  14    100   13    1250  17
STEWART      ANT      36   12     550   6     67   13     850  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   S   26   S   31
PORT HARDY   S   44   S   61   S   65
SANDSPIT     SE  52   SE  67   SE  83

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      100  m         12 C
PORT HARDY      400  m         14 C
ANNETTE         100  m         10 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.

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


END/MWSO