FPCN39 CWLW 161408
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 SATURDAY 16 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      37   13    1100   3     85   18    2550   5
KAMLOOPS     KEL      76   15    2150   6     92   20    3350   5
OKANAGAN     KEL      14    9     600   2     92   18    3350   5
CASTLEGAR    SPOK     30   11    1050   4     95   19    3500   5
CRANBROOK    SPOK     16    7    1100   4    100   15    3950   6
REVELSTOKE   KEL      43   11    1350   4     81   15    2400   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE   9   NE  13
CRANBROOK             VR   5   E   11

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         10 C
SPOKANE         1100 m         10 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     56   11    1950   6    100   16    3950   8
PR. GEORGE   P.G.     17    9     950   4     70   16    2300   5
SMITHERS     P.G.     33   13    1300   4     67   17    2200   5
WELLS GRAY   P.G.     64   12    2200   6    100   17    4000   8
FT NLSN      F.N.     17   13     600   4    100   19    3400   7
FT STJOHN    F.N.     17   12     900   4    100   17    3700   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  13   NE  17
SMITHERS              NW  11   VR  17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2500 m         19 C
FT. NELSON       700 m         15 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     77   12    1200   9     98   17    2350   7
FRASER VLY   QUIL     48   10     500  10     98   17    2300   7
SRN VRISL    QUIL     54   11     650   9     92   16    2150   7
CNTRL VRISL  QUIL     55   11     700   9     92   16    2150   7
NRN VRISL    HRDY     49   11     600   9     89   15    1300  11
TERRACE      ANT      38   13     700   7     83   21    2350   6
STEWART      ANT      29   14     500   4     78   21    2150   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  15   N    9   E   11
PORT HARDY   NW  35   N   30   NE  28
SANDSPIT     NW  26   W   19   W   13

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       500 m         10 C
PORT HARDY      1000 m         13 C
ANNETTE          500 m         14 C

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD




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


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