FPCN39 CWLW 241335
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 SUNDAY 24 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       9   16     600   0     85   21    2000   7
KAMLOOPS     KEL      44   17    1350   4     97   22    2450   8
OKANAGAN     KEL      33   16    1050   4     97   22    2450   8
CASTLEGAR    SPOK     46   16    1550   4     94   22    3500   5
CRANBROOK    SPOK    100   14    3950   6    100   19    3950   6
REVELSTOKE   KEL      63   17    1650   6     96   22    2500   8

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   S   24
CRANBROOK             VR   5   S   13

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          300 m         14 C
SPOKANE          200 m         13 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: 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.     10   15     950  23    100   21    3950  27
PR. GEORGE   P.G.     94   18    1500  19    100   22    3700  23
SMITHERS     P.G.      9   14     500   1     97   18     950   9
WELLS GRAY   P.G.     10   14    1000  23    100   22    4000  27
FT NLSN      F.N.     28   15     700   6     70   20    1600   8
FT STJOHN    F.N.     51   17    1600   6    100   23    3700  12

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  17   SE  30
SMITHERS              S   17   SE  30

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       200 m         16 C
FT. NELSON       500 m         17 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   15    1400  27    100   17    1900  28
FRASER VLY   QUIL    100   16    1700  27    100   20    2300  29
SRN VRISL    QUIL     87   14     700  19    100   17    1800  25
CNTRL VRISL  QUIL    100   15    1200  23    100   16    1650  25
NRN VRISL    HRDY     28   13     300   7     95   15     800  20
TERRACE      ANT     100   14    1550  30    100   19    2450  31
STEWART      ANT     100   15    1350  22    100   19    2050  26

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   13   S   24   S   33
PORT HARDY   S   33   S   46   S   59
SANDSPIT     SE  61   SE  67   SE  69

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      100  m         12 C
PORT HARDY      150  m         13 C
ANNETTE         100  m         11 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD BECOMING FAIR
 OVER N COAST ON THURSDAY.

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


END/MWSO