Station report
Helena Valley, MT (HVMT), 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 16 the noon sun stands 34 degrees above the horizon at 46.68 N, and the day is 10 h 42 min long. Level ground there takes 56 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at Helena Valley, MT (HVMT), angles true: on Oct 16 it stands 34 degrees above the horizon, against 67 at the June solstice, 43 at the equinoxes and 20 at the December solstice; the day is 10 h 42 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 USBR-HVMT FIG. E THE SUN AT HELENA VALLEY, MT (HVMT) 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 43° DECEMBER SOLSTICE 20° OCT 16, 34° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 10 H 42 MIN LEVEL GROUND TAKES 56 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 46.68 N; THE SUN'S DECLINATION -9.1° TITLE Helena Valley, MT (HVMT), the sun STATION REPORT · DCP USBR-HVMT TYPE ELEVATION SCALE ANGLES TRUE REV FROM THE REGISTER SHEET 1 of 2 DATE 2026-10-16 ID SR-USBRHVMT-1 DRAWN AS linework on paper SOURCES FB-ENG-007 A data collection platform. Its sensors, as its network builds them.
Elevation of a data collection platform, Helena Valley, MT (HVMT), 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 USBR-HVMT 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 Helena Valley, MT (HVMT), the instrument STATION REPORT · DCP USBR-HVMT TYPE ELEVATION SCALE SCHEMATIC REV FROM THE REGISTER SHEET 2 of 2 DATE 2026-10-16 ID SR-USBRHVMT-2 DRAWN AS linework on paper SOURCES FB-INS-001 
FB-ENG-007, Fig. ARadiation budget
FB-INS-001, Fig. AWhat an instrument is