FPCN39 CWLW 281339
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 28 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   17     500   3     38   23    1250   6
KAMLOOPS     KEL       9   15     500   0     23   20     850   3
OKANAGAN     KEL       9   15     500   0     14   19     700   2
CASTLEGAR    SPOK     23   14     850   4     25   16     900   4
CRANBROOK    SPOK      9   11     950   9      9   14     950   9
REVELSTOKE   KEL       9   14     450   0      9   16     600   0

*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   NW  19   N   28
CRANBROOK             VR   5   NW  11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          730 m         18 C
SPOKANE          980 m         17C

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: POOR

VENTING OUTLOOK TUESDAY THRU THURSDAY: POOR TO FAIR TO WEDNESDAY.
BECOMING GOOD AS THE AIRMASS BECOMES CONVECTIVELY UNSTABLE WEDNESDAY
AFTERNOON AND THURSDAY.

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   14     950  10     80   21    2950  11
PR. GEORGE   P.G.     25   15     900   8     90   24    3700  10
SMITHERS     P.G.      9   13     750   0     60   22    1500   7
WELLS GRAY   P.G.      9   15    1000  10    100   22    4000  11
FT NLSN      F.N.     14   18     500   4    100   27    3400   8
FT STJOHN    F.N.      9   15     700   4    100   22    3700   8

*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            N   24   NE  30
SMITHERS              VR   5   VR  30

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1460 m         22 C
FT. NELSON      1300 m         23 C

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON.

VENTING FOR MONDAY: POOR

VENTING OUTLOOK TUESDAY THRU THURSDAY:POOR TO FAIR TO WEDNESDAY.
BECOMING GOOD AS THE AIRMASS BECOMES CONVECTIVELY UNSTABLE WEDNESDAY
AFTERNOON AND INTO THURSDAY.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     43   15     450  10     77   20    1050  10
FRASER VLY   QUIL     50   17     550  10    100   26    1900  10
SRN VRISL    QUIL      9   14     400   0     53   20     800   7
CNTRL VRISL  QUIL      9   16     500   0     94   24    1750   9
NRN VRISL    HRDY     14   12     100   7     65   17     750  10
TERRACE      ANT      50   16    1150   5     59   25    2450   3
STEWART      ANT      39   16     850   4     60   25    2050   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
VANCOUVER    W   15   NW  13   N   11
PORT HARDY   N   20   NE   9   VR   5
SANDSPIT     NW  22   VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       600 m         20 C
PORT HARDY      1700 m         23 C
ANNETTE         2600 m         27 C

TODAY'S VENTING: GENERALY GOOD.

VENTING FOR MONDAY: POOR.

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.

END/lm