FPCN39 CWLW 141434
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 Saturday 14 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   22     750   3    100   30    1500  15
KAMLOOPS     KEL      49   24    1650   4     80   30    1800   8
OKANAGAN     KEL      34   23    1250   3     70   30    1700   6
CASTLEGAR    SPOK     35   20    1000   6     80   28    2500   7
CRANBROOK    SPOK     35   19    1300   8    100   26    3250   7
REVELSTOKE   KEL      22   20     900   3     80   29    1800   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   NW  15   N   19
CRANBROOK             VR   5   NW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         24 C
SPOKANE         1450 m         25 C

TODAY'S VENTING: BECOMING GOOD EARLY THIS AFTERNOON WITH DAYTIME
HEATING.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GENERALLY GOOD EXCEPT POOR TO
FAIR ON TUESDAY.




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   18    2400   8     80   26    2400   8
PR. GEORGE   P.G.     42   15    1100   8     80   23    2200   8
SMITHERS     P.G.     11   14     750   1     80   20    2800   5
WELLS GRAY   P.G.    100   15    2500   5     80   26    2500   8
FT NLSN      F.N.     48   18     550  31    100   24    3400  31
FT STJOHN    F.N.     60   16    1150  15    100   22    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   17   W   24
SMITHERS              SW  17   SW  24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         17 C
FT. NELSON       550 m         20 C

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON WITH DAYTIME
HEATING.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GENERALLY GOOD EXCEPT ONLY
FAIR ON TUESDAY.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     40   17     700   5     54   21     900  10
FRASER VLY   QUIL     40   17     700   5     54   23    1000   8
SRN VRISL    QUIL     40   17     700   5     50   22     800   8
CNTRL VRISL  QUIL     40   19     950   5     50   24     800   8
NRN VRISL    HRDY      9   13       0   6     45   18     600   8
TERRACE      ANT      50   15    1200   6     60   19    1400   6
STEWART      ANT      40   14     700   6     60   19    1400   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  15   NW  20
PORT HARDY   W   15   W   19   W   26
SANDSPIT     S   31   SW  43   SW  50

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      4000 m         43 C
PORT HARDY      2500 m         32 C
ANNETTE         NONE m         ## C

TODAY'S VENTING: IN THE SOUTH A RIDGE OF HIGH PRESSURE WILL GIVE
POOR TO FAIR VENTING TODAY. IN THE NORTH THE AIRMASS IS UNSTABLE
ENOUGH AT LOW LEVELS FOR GOOD VENTING FOR A COUPLE HOURS THIS
AFTERNOON.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR BECOMING GOOD WEDNESDAY.




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

END/JDG