FPCN39 CWLW 101432
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 10 May 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      29   16     650   5    100   25    3200  22
KAMLOOPS     KEL      90   17    1350  14    100   26    3350  22
OKANAGAN     KEL      25   15     700   5    100   26    3350  22
CASTLEGAR    SPOK     29   15     750   8    100   25    3500  11
CRANBROOK    SPOK      9   12     950   5    100   21    3950  13
REVELSTOKE   KEL      17   13     600   5    100   22    3450  22


*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   N    9   N    9
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          825 m         15 C
SPOKANE          915 m         18 C

TODAY'S VENTING: GOOD THIS AFTERNOON.

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THROUGH WEDNESDAY: GENERALLY GOOD IN THE
AFTERNOONS.


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   10    2500  12    100   20    3950  12
PR. GEORGE   P.G.     76    9    1450  13    100   18    3700  12
SMITHERS     P.G.     39    8    1000   7    100   17    3500  10
WELLS GRAY   P.G.     99    9    2450  12    100   19    4000  12
FT NLSN      P.G.     45    9     950   7    100   16    2600  10
FT STJOHN    P.G.    100   11    2300  11    100   17    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   11   NW  20
SMITHERS              VR   5   W   20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m          9 C
FT. NELSON      MISSING

TODAY'S VENTING: GOOD BY THE AFTERNOON.

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THROUGH WEDNESDAY: GENERALLY GOOD IN THE
AFTERNOONS.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     37   14     400  10     73   19    1050  10
FRASER VLY   QUIL     41   15     450  10     90   24    1800   8
SRN VRISL    QUIL     31   13     350   8     74   20    1150   9
CNTRL VRISL  QUIL     36   15     400   8     79   21    1400   8
NRN VRISL    HRDY     16   10     250   3     79   16    1450   4
TERRACE      ANT     100   10    1100  20    100   17    2550  15
STEWART      ANT      97   11     850  20    100   17    2200  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
VANCOUVER    NE  17   NE  17   NE   9
PORT HARDY   N   13   VR   5   VR   5
SANDSPIT     S   33   S   26   SW  30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       550 m         17 C
PORT HARDY      1050 m         16 C
ANNETTE         NO INVERSION

TODAY'S VENTING: GOOD IN THE AFTERNOON.

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THROUGH WEDNESDAY: GOOD IN THE AFTERNOONS.

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

END/MWSO