FPCN39 CWLW 271322
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 27 JUNE 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   15     200   2     36   21    1700   2
KAMLOOPS     KEL      17   16     750   2     46   23    2550   2
OKANAGAN     KEL      12   15     500   2     46   23    2550   2
CASTLEGAR    SPOK     55   15    1000  11    100   21    3500  13
CRANBROOK    SPOK     62   13    1400  15    100   18    3950  13
REVELSTOKE   KEL      10   14     500   2     39   20    2100   2

*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    NW   9   NW  20   NW  28
CRANBROOK             NW  11   NW  35

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         NONE
SPOKANE         1100 m         15 C

TODAY'S VENTING: FAIR.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     51   14    1400  11    100   21    3950  10
PR. GEORGE   P.G.     ##   ##     ###  ##    100   22    3700   9
SMITHERS     P.G.     35   15    1000   6    100   22    2900   8
WELLS GRAY   P.G.     92   16    2550   9    100   22    4000  10
FT NLSN      F.N.     27   16     600   8    100   24    3400  13
FT STJOHN    F.N.      9   14     700   8    100   21    3700  13

*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            NW  20   N   17
SMITHERS              W   11   VR  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1225 m         16 C
FT. NELSON       775 m         17 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     39   15    1350   3     46   20    1750   3
FRASER VLY   QUIL     39   15    1300   3     43   19    1500   3
SRN VRISL    QUIL     24   13     650   3     37   19    1450   2
CNTRL VRISL  QUIL     31   14     950   3     37   19    1450   2
NRN VRISL    HRDY     19   12     250   4     54   16    1100   5
TERRACE      ANT      47   15    1250   4     84   22    2450   5
STEWART      ANT      61   15     800   9     81   22    2000   6

*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    W   15   NW  13   N    9
PORT HARDY   NW  17   N   13   N    9
SANDSPIT     W    9   SW   9   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NIL
PORT HARDY      NIL
ANNETTE         NIL

TODAY'S VENTING: FAIR.

VENTING FOR SUNDAY: FAIR.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR.

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

END/MWSO