FPCN39 CWLW 151344
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 FRIDAY 15 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      13   18     550   1     54   21    1000   7
KAMLOOPS     KEL      12   18     600   1    100   25    2500   9
OKANAGAN     KEL      11   16     550   1     88   24    2100   8
CASTLEGAR    SPOK     32   15     900   6    100   22    2750  15
CRANBROOK    SPOK     68   16    2050   8    100   23    3950  18
REVELSTOKE   KEL      11   17     600   1    100   24    2450   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  24   SW  19
CRANBROOK    E   15   SW  44   SW  33
           INVERSION HT    BREAKTHRU TEMP
KELOWNA         150  m         8  C
SPOKANE         200  m         7  C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: 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.     19   13    1050   8    100   20    3950  13
PR. GEORGE   P.G.     22   13     850   9     93   21    2250  10
SMITHERS     P.G.     12   12     700   2     40   17    1050  10
WELLS GRAY   P.G.     23   14    1200   8    100   21    4000  13
FT NLSN      F.N.     65   15     750  21     75   18     850  21
FT STJOHN    F.N.     ##   ##     ###  ##    100   19    1600  25

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE   S   7    NW   7   E   17
SMITHERS     VR  5    NW  10   NW  20

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      600  m         12 C
FT. NELSON     1200  m         14 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     66   14    1200   7     73   17    1350   7
FRASER VLY   QUIL     70   15    1250   7     76   18    1450   7
SRN VRISL    QUIL     63   15    1200   6     70   18    1400   6
CNTRL VRISL  QUIL     50   13     900   6     65   16    1300   6
NRN VRISL    HRDY     71   11    1000   9     75   13    1300   8
TERRACE      ANT      88    9    1550  10    100   12    2150  10
STEWART      ANT      60   10     850   8    100   12    1900  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   10   E   19   E   28
PORT HARDY   E   12   E   17   E   25
SANDSPIT     NW  19   NW  25   NW  35

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      100  m         8  C
PORT HARDY      100  m         8  C
ANNETTE         150  m         11 C

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: FAIR

VENTING OUTLOOK SUNDAY THRU TUESDAY: FAIR

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


END/MWSO