FPCN39 CWLW 161416
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 TUESDAY 16 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   14     200   5    100   20    2050  14
KAMLOOPS     KEL       9   14     350   5    100   20    2500  16
OKANAGAN     KEL       9   13     350   5    100   20    2500  16
CASTLEGAR    SPOK     45   15     900  11    100   19    1950  14
CRANBROOK    SPOK     10   12     950  15    100   16    3950  20
REVELSTOKE   KEL       9   13     450   5     50   16    1000  10

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   13   W   28   NW  41
CRANBROOK             W   11   W   28

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          350 m         13 C
SPOKANE         1200 m         15 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.     85    9    1900  10    100   ##    2500  15
PR. GEORGE   P.G.    100    8    2200  15    100   15    2500  15
SMITHERS     P.G.     50    9    1250   7     90   15    2450   7
WELLS GRAY   P.G.     80    7    1200  15    100   13    1800  15
FT NLSN      F.N.      9   10     400  14     80   13    1200  14
FT STJOHN    F.N.     69   11    1350  13     90   14    1800  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  24   NW  28
SMITHERS              NW  28   N   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2000 m         13 C
FT. NELSON      1700 m         14 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     61   13     550  14    100   16    1450  16
FRASER VLY   QUIL     61   13     550  14    100   16    1400  16
SRN VRISL    QUIL     28   12     300   7    100   17    1600  15
CNTRL VRISL  QUIL      9   11      50   4    100   17    1650  15
NRN VRISL    HRDY     16   10     150   5    100   13    1600  16
TERRACE      ANT      47   11    1450   4    100   18    2600   8
STEWART      ANT      38   12    1100   3     95   18    2250   7

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   35   NW  41   NW  44
PORT HARDY   NW  57   NW  59   N   56
SANDSPIT     NW  50   NW  48   NW  48

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2000 m         20 C
PORT HARDY       300 m         10 C
ANNETTE         1900 m         14 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD

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

END/MWSO