Station report
Spirit Lake Tunnel Outlet Nr Spirit Lake, in 3 sheets Drawn from the register, in the manner of the Field Book, and opened beside the plates that explain each part of it.
1 The column2 The sun3 The instrumentAt 3,341 ft above sea level, 11 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 26.48 inHg and the temperature at 47.1 F.
Section from sea level of where Spirit Lake Tunnel Outlet Nr Spirit Lake stands in the atmosphere, height to scale: the station 3,341 feet above sea level with 11 per cent of the air below it; the standard atmosphere's pressure there, 26.48 inches of mercury, and temperature, 47.1 degrees Fahrenheit. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT 14240311 FIG. D WHERE SPIRIT LAKE TUNNEL OUTLET NR SPIRIT LAKE STANDS IN THE ATMOSPHERE SECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHERE FT ABOVE SEA LEVEL 0 5,000 10,000 15,000 SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERE SPIRIT LAKE TUNNEL OUTLET NR SPIRIT LAKE 11 PER CENT OF THE AIR BELOW IT 3,341 FT 10 PER CENT OF THE AIR BELOW, 2,890 FT 20 PER CENT OF THE AIR BELOW, 6,050 FT 30 PER CENT OF THE AIR BELOW, 9,540 FT 40 PER CENT OF THE AIR BELOW, 13,470 FT STANDARD PRESSURE HERE 26.48 inHg STANDARD TEMPERATURE HERE 47.1 F TITLE Spirit Lake Tunnel Outlet Nr Spirit Lake, the column STATION REPORT · DCP 14240311 TYPE SECTION SCALE HEIGHT TO SCALE REV FROM THE REGISTER SHEET 1 of 3 DATE 2026-10-16 ID SR-14240311-1 DRAWN AS linework on paper SOURCES FB-ENG-001, FB-ENG-003 On Oct 16 the noon sun stands 35 degrees above the horizon at 46.28 N, and the day is 10 h 43 min long. Level ground there takes 57 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at Spirit Lake Tunnel Outlet Nr Spirit Lake, angles true: on Oct 16 it stands 35 degrees above the horizon, against 67 at the June solstice, 44 at the equinoxes and 20 at the December solstice; the day is 10 h 43 min long. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT 14240311 FIG. E THE SUN AT SPIRIT LAKE TUNNEL OUTLET NR SPIRIT LAKE ELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUE THE STATION JUNE SOLSTICE 67° EQUINOXES 44° DECEMBER SOLSTICE 20° OCT 16, 35° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 10 H 43 MIN LEVEL GROUND TAKES 57 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 46.28 N; THE SUN'S DECLINATION -9.1° TITLE Spirit Lake Tunnel Outlet Nr Spirit Lake, the sun STATION REPORT · DCP 14240311 TYPE ELEVATION SCALE ANGLES TRUE REV FROM THE REGISTER SHEET 2 of 3 DATE 2026-10-16 ID SR-14240311-2 DRAWN AS linework on paper SOURCES FB-ENG-007 A data collection platform, 3,341 ft above sea level. Its sensors, as its network builds them.
Elevation of a data collection platform, Spirit Lake Tunnel Outlet Nr Spirit Lake, each sensor drawn and labelled with what it read: no reading in the last day. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT 14240311 FIG. F THE INSTRUMENT ELEVATION OF A DATA COLLECTION PLATFORM, EACH SENSOR WITH WHAT IT READ ANTENNA, SENDING BY SATELLITE - AIR TEMPERATURE - PRECIPITATION GAUGE - SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALE TITLE Spirit Lake Tunnel Outlet Nr Spirit Lake, the instrument STATION REPORT · DCP 14240311 TYPE ELEVATION SCALE SCHEMATIC REV FROM THE REGISTER SHEET 3 of 3 DATE 2026-10-16 ID SR-14240311-3 DRAWN AS linework on paper SOURCES FB-INS-001 
FB-ENG-001, Fig. AAtmosphere in section
FB-ENG-003, Fig. CHydrostatic balance
FB-ENG-007, Fig. ARadiation budget
FB-INS-001, Fig. AWhat an instrument is