FPCN39 CWLW 291335
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 MONDAY 29 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      21   20     800   2     57   28    3200   2

KAMLOOPS     KEL      21   19     950   2     48   25    2700   2

OKANAGAN     KEL      17   18     750   2     48   25    2700   2

CASTLEGAR    SPOK     23   17     850   4     34   23    1200   4

CRANBROOK    SPOK      9   14     950   4    100   21    3950   7

REVELSTOKE   KEL      15   17     750   2     44   23    2450   2


*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    VR   5   VR   5   SW  11
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          800 m         17 C
SPOKANE         1100 m         22 C

TODAY'S VENTING: GENERALLY FAIR.

VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY:GOOD TO FAIR IN THE
AFTERNOON WITH CONVECTION.


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.     30   16    1150  12    100   23    3950  13

PR. GEORGE   P.G.     44   17     950  15    100   23    3700  14

SMITHERS     P.G.     37   17     850   9    100   23    2150  13

WELLS GRAY   P.G.      9   15    1000  12    100   23    4000  13

FT NLSN      F.N.     27   16     600   5    100   28    3400  10
FT STJOHN    F.N.      9   14     700   5    100   23    3700  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
PR. GEORGE            E   20   E   24
SMITHERS              E   19   E   24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1040 m         24 C
FT. NELSON       760 m         23 C

TODAY'S VENTING:BECOMING GOOD NEAR NOON.

VENTING FOR TUESDAY: FAIR


VENTING OUTLOOK WEDNESDAY THRU FRIDAY:GOOD TO FAIR IN THE
AFTERNOON WITH CONVECTION.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   18     600   4     33   21     750   4

FRASER VLY   QUIL     32   20     700   4     73   28    2150   4

SRN VRISL    QUIL     19   16     550   2     28   21     700   3

CNTRL VRISL  QUIL     26   19     650   3     71   28    2100   4

NRN VRISL    HRDY     59   13     500  14     65   17     600  14

TERRACE      ANT       9   18     200   8     87   27    2150   7

STEWART      ANT      20   18     250   5     70   27    1750   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     N   17   VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       970 m         24 C
PORT HARDY       940 m         25 C
ANNETTE          520 m         22 C

TODAY'S VENTING: GNERALLY FAIR.


VENTING FOR TUESDAY: FAIR

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR WITH RIDGE REMAINING OFF
THE COAST.


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


END/LM