Station report
Citizen station EW4939, in 4 sheets Drawn from its report of undefined, in the manner of the Field Book, and opened beside the plates that explain each part of it.
1 The wind2 The column3 The sun4 The instrumentCalm.
Plan of the wind at Citizen station EW4939, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked. 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 EW4939 FIG. C THE WIND AT CITIZEN STATION EW4939 PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALE N E S W THE STATION CALM BEAUFORT FORCE LEAST WIND, MPH 0 CALM 0 NOW, 0 MPH 1 LIGHT AIR 1 GUST, 1 MPH 2 LIGHT BREEZE 4 3 GENTLE BREEZE 8 4 MODERATE BREEZE 13 5 FRESH BREEZE 19 6 STRONG BREEZE 25 7 NEAR GALE 32 8 GALE 39 9 STRONG GALE 47 10 STORM 55 11 VIOLENT STORM 64 12 HURRICANE FORCE 73 TITLE Citizen station EW4939, the wind STATION REPORT · CWOP EW4939 TYPE PLAN north up SCALE NOT TO SCALE REV AS REPORTED SHEET 1 of 4 DATE 2026-10-11 ID SR-EW4939-1 DRAWN AS linework on paper SOURCES FB-EVT-150, FB-ENG-008 At 789 ft above sea level, 3 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.08 inHg and the temperature at 56.2 F; the station's altimeter setting of 29.96 inHg means its barometer reads 29.12 inHg; it reports 59.0 F, 2.8 F warmer than standard.
Section from sea level of where Citizen station EW4939 stands in the atmosphere, height to scale: the station 789 feet above sea level with 3 per cent of the air below it; the standard atmosphere's pressure there, 29.08 inches of mercury, and temperature, 56.2 degrees Fahrenheit; the altimeter setting of 29.96 and the station pressure it means, 29.12. 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 EW4939 FIG. D WHERE CITIZEN STATION EW4939 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 CITIZEN STATION EW4939 3 PER CENT OF THE AIR BELOW IT 789 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 29.08 inHg STANDARD TEMPERATURE HERE 56.2 F ALTIMETER SETTING, REPORTED 29.96 inHg ITS BAROMETER READS 29.12 inHg TEMPERATURE, REPORTED 59.0 F TITLE Citizen station EW4939, the column STATION REPORT · CWOP EW4939 TYPE SECTION SCALE HEIGHT TO SCALE REV AS REPORTED SHEET 2 of 4 DATE 2026-10-11 ID SR-EW4939-2 DRAWN AS linework on paper SOURCES FB-ENG-001, FB-ENG-003 On Oct 11 the noon sun stands 43 degrees above the horizon at 39.30 N, and the day is 11 h 12 min long. Level ground there takes 69 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at Citizen station EW4939, angles true: on Oct 11 it stands 43 degrees above the horizon, against 74 at the June solstice, 51 at the equinoxes and 27 at the December solstice; the day is 11 h 12 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 EW4939 FIG. E THE SUN AT CITIZEN STATION EW4939 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 74° EQUINOXES 51° DECEMBER SOLSTICE 27° OCT 11, 43° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 11 H 12 MIN LEVEL GROUND TAKES 69 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 39.30 N; THE SUN'S DECLINATION -7.2° TITLE Citizen station EW4939, the sun STATION REPORT · CWOP EW4939 TYPE ELEVATION SCALE ANGLES TRUE REV AS REPORTED SHEET 3 of 4 DATE 2026-10-11 ID SR-EW4939-3 DRAWN AS linework on paper SOURCES FB-ENG-007 A weather instrument, 789 ft above sea level. Its latest report is written on the sensors that made it.
Elevation of the instrument, Citizen station EW4939, each sensor drawn and labelled with what it read: air temperature, 59.0 f; precipitation gauge, 0.00 in today. 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 EW4939 FIG. F THE INSTRUMENT ELEVATION OF THE INSTRUMENT, EACH SENSOR WITH WHAT IT READ ANTENNA, SENDING BY SATELLITE - AIR TEMPERATURE 59.0 F PRECIPITATION GAUGE 0.00 IN TODAY SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALE TITLE Citizen station EW4939, the instrument STATION REPORT · CWOP EW4939 TYPE ELEVATION SCALE SCHEMATIC REV AS REPORTED SHEET 4 of 4 DATE 2026-10-11 ID SR-EW4939-4 DRAWN AS linework on paper SOURCES FB-INS-001 
FB-EVT-150, Fig. AHigh wind
FB-ENG-008, Fig. ACoriolis as geometry
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