FPCN39 CWLW 071340
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 7 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      18   19     750   2     83   25    2250   6
KAMLOOPS     KEL      15   17     700   2    100   25    3350   6
OKANAGAN     KEL      15   17     700   2    100   24    3350   6
CASTLEGAR    SPOK     40   17     950   8     93   24    3500   5
CRANBROOK    SPOK      9   13     950   9     78   21    3950   4
REVELSTOKE   KEL      22   17     950   3    100   25    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   E   13   E   17
CRANBROOK             E    9   E   22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         730 m         16 C
SPOKANE         1030 m        16 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.      9   13     950   9    100   20    2850  10
PR. GEORGE   P.G.      9   14     700   7    100   22    2800  10
SMITHERS     P.G.     12   17     800   1    100   26    3500   9
WELLS GRAY   P.G.      9   15    1000   9    100   22    4000  10
FT NLSN      F.N.     19   19     550   6    100   27    3400   6
FT STJOHN    F.N.      9   14     700   6     37   22    1300   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  20   NE  19
SMITHERS              VR   5   NE  19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         18 C
FT. NELSON      640 m          24 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     42   17     600   7     62   21    1050   7
FRASER VLY   QUIL     46   18     650   7     85   26    2000   7
SRN VRISL    QUIL      9   16     550   0      9   22    1100   0
CNTRL VRISL  QUIL      9   17     600   0     67   26    1900   4
NRN VRISL    HRDY     25   13     600   3     30   16     650   4
TERRACE      ANT      54   18     550  17    100   28    1850  11
STEWART      ANT      60   19     500  13    100   28    1650  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
VANCOUVER    N    9   NE  19   NE  24
PORT HARDY   N   20   NE  15   NE  20
SANDSPIT     N   43   N   30   N   30

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         24 C
PORT HARDY      1400 m         28 C
ANNETTE         1900 m         31 C

TODAY'S VENTING: FAIR

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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