Station report
I-71 at mile 42.5, in 2 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 sun2 The instrumentOn Oct 11 the noon sun stands 44 degrees above the horizon at 38.63 N, and the day is 11 h 14 min long. Level ground there takes 70 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at I-71 at mile 42.5, angles true: on Oct 11 it stands 44 degrees above the horizon, against 75 at the June solstice, 51 at the equinoxes and 28 at the December solstice; the day is 11 h 14 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 06_71_0043 FIG. E THE SUN AT I-71 AT MILE 42.5 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 75° EQUINOXES 51° DECEMBER SOLSTICE 28° OCT 11, 44° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 11 H 14 MIN LEVEL GROUND TAKES 70 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 38.63 N; THE SUN'S DECLINATION -7.2° TITLE I-71 at mile 42.5, the sun STATION REPORT · RWIS 06_71_0043 TYPE ELEVATION SCALE ANGLES TRUE REV FROM THE REGISTER SHEET 1 of 2 DATE 2026-10-11 ID SR-06710043-1 DRAWN AS linework on paper SOURCES FB-ENG-007 A road weather station. Its sensors, as its network builds them.
Elevation of a road weather station, I-71 at mile 42.5, 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 06_71_0043 FIG. F THE INSTRUMENT ELEVATION OF A ROAD WEATHER STATION, EACH SENSOR WITH WHAT IT READ THE ROAD, IN SECTION PAVEMENT SENSOR, SET IN THE ROAD - PROBE UNDER THE ROAD - AIR TEMPERATURE ON THE TOWER - WIND AT THE TOP OF THE TOWER - SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALE TITLE I-71 at mile 42.5, the instrument STATION REPORT · RWIS 06_71_0043 TYPE ELEVATION SCALE SCHEMATIC REV FROM THE REGISTER SHEET 2 of 2 DATE 2026-10-11 ID SR-06710043-2 DRAWN AS linework on paper SOURCES FB-INS-001