FPCN39 CWLW 111319
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 11 MAY 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      20   20     750   2     76   27    3200   3
KAMLOOPS     KEL      36   21    1350   3     76   28    3350   3
OKANAGAN     KEL      17   17     650   3     76   26    3350   3
CASTLEGAR    SPOK     55   18    1300   7    100   24    3500   8
CRANBROOK    SPOK     55   16    1400   6    100   22    3950   9
REVELSTOKE   KEL      14   16     650   3     76   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 MONDAY 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          800 m         17 C
SPOKANE         1500 m         18 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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   3     98   22    3950   6
PR. GEORGE   P.G.     19   12     850   7     99   22    3700   6
SMITHERS     P.G.     21   14     850   4     74   20    3000   4
WELLS GRAY   P.G.      9   13    1000   3     98   22    4000   6
FT NLSN      F.N.     30   14     550  12    100   23    3400  13
FT STJOHN    F.N.     25   12     800   6    100   21    3700  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            VR   5   VR   5
SMITHERS              S   15   S    5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1000 m         19 C
FT. NELSON      1200 m         19 C

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     34   14    1700   7     48   17    2000   9
FRASER VLY   QUIL     34   14    1700   7     50   18    2100   9
SRN VRISL    QUIL     36   14    1600   6     43   18    2050   7
CNTRL VRISL  QUIL     39   15    1750   6     50   19    2200   9
NRN VRISL    HRDY     37   10     750   8     49   14    1600  11
TERRACE      ANT      37   12    1550   8     50   18    2650  10
STEWART      ANT      35   12    1200   8     50   18    2400   9

*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   SE  11   SE  26
PORT HARDY   NW  11   S   11   S   37
SANDSPIT     NW  26   VR   5   S   19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       100 m          9 C
PORT HARDY      2400 m         19 C
ANNETTE         1700 m         13 C

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR TO GOOD

VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR TO GOOD




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


END/JMS