FPCN39 CWLW 121434
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 Thursday 12 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      25   20    1100   2     61   25    2400   3
KAMLOOPS     KEL      25   19    1250   2     63   24    2550   3
OKANAGAN     KEL      25   19    1250   2     63   24    2550   3
CASTLEGAR    SPOK     58   16    1250   8    100   20    3500   9
CRANBROOK    SPOK    100   15    3950  10    100   19    3950  10
REVELSTOKE   KEL      16   16     900   2     40   20    1850   3

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   15   N   20
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         18 C
SPOKANE         1400 m         17 C

TODAY'S VENTING: generally good.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: generally 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.     64   17    1700  10    100   22    3950   8
PR. GEORGE   P.G.     25   17    1050   5     84   21    2450   7
SMITHERS     P.G.     13   17     850   1     73   22    2150   6
WELLS GRAY   P.G.     81   18    2450   8    100   22    4000   8
FT NLSN      F.N.     41   19     650  13     74   22    1100  13
FT STJOHN    F.N.      9   17     700  13    100   22    2650  12

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   19   NE  19
SMITHERS              W   13   W   19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         21 C
FT. NELSON       800 m         22 C

TODAY'S VENTING: good.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: generally good.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     60   16    1550   4     76   20    2400   4
FRASER VLY   QUIL     59   16    1500   4     75   20    2400   4
SRN VRISL    QUIL     30   14     550   4     69   18    1950   4
CNTRL VRISL  QUIL     44   15     950   5     73   19    2250   4
NRN VRISL    HRDY      9   13     300   0     20   15     900   1
TERRACE      ANT      54   18    1250   5     85   23    2200   6
STEWART      ANT      40   17     900   4     77   23    1900   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   20   NW  17   NE  19
PORT HARDY   NW  20   N   13   VR   5
SANDSPIT     SW  19   SW  19   SW  19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         13 C
PORT HARDY       100 m         13 C
ANNETTE          100 m         13 C

TODAY'S VENTING: generally good.

VENTING FOR FRIDAY: GOOD.

VENTING OUTLOOK SATURDAY THRU MONDAY: generally good.


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

END/dsl