FPCN39 CWLW 241333
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 WEDNESDAY 24 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   16     200   8    100   21    1600  17
KAMLOOPS     KEL       9   14     350   8    100   22    2650  18
OKANAGAN     KEL       9   14     350   8    100   20    2050  18
CASTLEGAR    SPOK     74   16    1100  16     91   20    1350  17
CRANBROOK    SPOK     57   15    1250  19    100   21    3950  17
REVELSTOKE   KEL       9   16     450   8    100   19    2050  18

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


FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   W   28
CRANBROOK             SW  11   SW  30


           INVERSION HT    BREAKTHRU TEMP
KELOWNA         9000 m         15 C
SPOKANE         4400 m         16 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: 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.    100   13    2250  14    100   18    3950  17
PR. GEORGE   P.G.     71   13    1600  10    100   17    2400  12
SMITHERS     P.G.     17   12     850   3     96   17    2250   9
WELLS GRAY   P.G.    100   15    2800  15    100   19    4000  17
FT NLSN      F.N.      9   15     400  11     67   19    1000  10
FT STJOHN    F.N.      9   13     700   8    100   19    2600  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   19   S   24
SMITHERS              W    9   VR  24


           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      8000 m         14 C
FT. NELSON      2800 m         17 C

TODAY'S VENTING: GOOD


VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     10   14     100  22    100   18    1250  21
FRASER VLY   QUIL     77   14     550  22    100   18    1200  22
SRN VRISL    QUIL     29   14     450   5     94   18    1150  14
CNTRL VRISL  QUIL     37   15     650   5    100   19    1350  15
NRN VRISL    HRDY     21   13     400   4     52   15     750   7
TERRACE      ANT      24   11     650   4     85   17     850  10
STEWART      ANT      30   11     650   5     77   16     900  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  24   SW  31   SW  31
PORT HARDY   W   19   W   22   W   26
SANDSPIT     NW  28   NW  30   NW  28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      8000 m         20 C
PORT HARDY      6200 m         14 C
ANNETTE         6000 m         14 C

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD




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


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