FPCN39 CWLW 151430
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Sunday 15 June 1997 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   23     700  20    100   29    1850  20
KAMLOOPS     KEL      20   21     650   4    100   29    3350  10
OKANAGAN     KEL      20   21     650   4    100   29    3350  10
CASTLEGAR    SPOK     28   19     800   7    100   29    3500  10
CRANBROOK    SPOK      9   19     950  11    100   27    3950  10
REVELSTOKE   KEL      12   19     600   2     96   28    3450   5

*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    W   11   W   20   W   30
CRANBROOK             VR   5   W   17

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         25 C
SPOKANE         1400 m         26 C

TODAY'S VENTING: THE AIRMASS WILL DESTABILIZE THIS AFTERNOON SO
THE VENTING WILL BECOME GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR TUESDAY THEN GOOD
FOR WEDNESDAY AND THURSDAY.




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.      9   17     950   5    100   23    3950  16
PR. GEORGE   P.G.      9   16     800   0    100   21    3700  12
SMITHERS     P.G.     11   15     650   1    100   16    3000  15
WELLS GRAY   P.G.      9   16    1000   5    100   22    4000  16
FT NLSN      F.N.      9   15     400   8    100   22    2350   8
FT STJOHN    F.N.     39   18    1250   6    100   23    3700   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   37   W   50
SMITHERS              W   30   W   50

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       950 m         21 C
FT. NELSON       700 m         21 C

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON AS THE AIRMASS
DESTABILIZES.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GENERALLY GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     78   18     850  14     85   22    1000  14
FRASER VLY   QUIL     79   18     800  14     95   24    1200  14
SRN VRISL    QUIL     19   16     550   2     85   22     950  15
CNTRL VRISL  QUIL     26   21     900   2     95   25    1250  15
NRN VRISL    HRDY     26   16     300   7     80   17     900  15
TERRACE      ANT     100   15    1250  29    100   19    2150  29
STEWART      ANT     100   17    1250  25    100   19    1700  26

*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   17   W   24   W   35
PORT HARDY   SW  17   SW  22   W   31
SANDSPIT     NW  17   W   20   W   28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1800 m         28 C
PORT HARDY      1600 m         26 C
ANNETTE         none m         ## C

TODAY'S VENTING: VENTING WILL BE GOOD IN THE NORTH ALL DAY DUE
TO AN UNSTABLE AIRMASS. IN THE SOUTH VENTING WILL BE GOOD JUST
BECAUSE OF SURFACE WINDS.

VENTING FOR MONDAY: FAIR TO GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.


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

END/JDG