FPCN39 CWLW 211321
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 SUNDAY 21 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      19   18     650   2     77   26    3350   3
KAMLOOPS     KEL      16   17     700   2     77   26    3350   3
OKANAGAN     KEL      15   16     650   2     85   27    3300   3
CASTLEGAR    SPOK     28   18     900   5     75   28    3500   3
CRANBROOK    SPOK      9   15     950   5     90   23    4000   3
REVELSTOKE   KEL      21   18    1000   2     77   25    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1500 m         23 C
SPOKANE         1200 m         21 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     10   16     950  14    100   25    3950   9
PR. GEORGE   P.G.      9   16     700   7    100   24    3700   9
SMITHERS     P.G.     10   16     650   1    100   27    3500   8
WELLS GRAY   P.G.     10   17    1000  14    100   25    4000   9
FT NLSN      F.N.     ##   ##     ###  ##    100   26    3400  11
FT STJOHN    F.N.      9   17     700  10    100   25    3700  11

*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   13   W   17
SMITHERS              W   19   W   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         23 C
FT. NELSON       900 m         23 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     53   17     550  12     45   21     700   8
FRASER VLY   QUIL     60   19     600  12    100   27    1850   8
SRN VRISL    QUIL      9   17     500   0     64   24    1000   8
CNTRL VRISL  QUIL      9   18     550   0    100   28    3050  10
NRN VRISL    HRDY     67   13     500  17     35   17     800  14
TERRACE      ANT      10   16     250  14    100   25    1850  17
STEWART      ANT      57   17     600  10    100   25    1450  13

*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    VR   5   N   11   N   15
PORT HARDY   NW  33   N   26   NW  20
SANDSPIT     W   30   W   35   W   37

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1300 m         23 C
PORT HARDY      1500 m         27 C
ANNETTE         1500 m         24 C

TODAY'S VENTING: GOOD INLAND. FAIR ALONG THE COAST.

VENTING FOR MONDAY: FAIR.

VENTING OUTLOOK TUESDAY THRU THURSDAY: FAIR.

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


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