Storm Station
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At a lighthouse

DCP network, identified by the register

Identifier
NDBC-APNM4
Latitude
45.06000 N
Longitude
83.42400 W
Elevation
-
Rank
904of 979 in Michigan, Oct 16
Observed
3:10 AMEDT, 40 minutes ago
Air temperature
51.8F
Wind
7mph
Gust
8mph
Wind direction
70°

Ranking Statistics

On the radar over Alpena Harbor Light, AlpenaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

At a lighthouse

Drawn as the kind of place it stands at. 5 instruments in Michigan stand at one.

Station charts

Alpena Harbor Light, Alpena Report

Rank 904 of 979 in Michigan, Oct 16. The 247 rank orders a state's stations by their 247 score out of 100: how reliably they report, how accurate their readings are against a reference station, how their readings pass their checks, and how they stand against the forecast.

Ranking Statistics

247 score75.2of 100

Michigan median
95.5the median score of 979 stations
Scoring higher
903stations in Michigan
Sharing its score
1no other station
Points deducted
24.810.2 accuracy, 8.7 reports received, 2.6 arrival, 1.6 continuity, 0.9 instrument checks, 0.8 forecast check
Counted at the median
Forecast checknot measured at this station; Michigan median 92.3
Next above
GW4207rank 903; ahead on 247 score 75.4 against 75.2
Next below
CW2931rank 905; behind on 247 score 75.2 against 75.1

Equal scores are ordered by the share of scheduled reports received, then the reports due in the week (the longer record first), then the median arrival, then the longest silence.

  1. Reports receivedweight 3575.226.3 of 35 pointsMichigan median 98.2379 of 504 scheduled reports received in 7 days
  2. Arrivalweight 1074.47.4 of 10 pointsMichigan median 96.9half its reports arrived within 23 min
  3. Continuityweight 1083.98.4 of 10 pointsMichigan median 100.0longest silence 1.7 h, on a schedule of one report every 20 min
  4. Accuracyweight 2048.89.8 of 20 pointsMichigan median 100.0its temperature against the airport station KAPN, 6.9 miles away, over 319 readings: typical difference 5.5 °F beyond a steady offset of +0.0 °F
  5. Instrument checksweight 1593.714.1 of 15 pointsMichigan median 100.01 of 319 readings failed their check against its reference station
  6. Forecast checkweight 10-9.2 of 10 points, at the medianMichigan median 92.3-

The score is the weighted mean of its six parts, from the last 7 days. How a station is ranked sets out each part.

How each part is scored
Reports received
Full marks for every scheduled report received, none for none, in proportion between
Arrival
Full marks for a median arrival within 10 min, none at 60 min
Continuity
Full marks for a longest silence of 3 reports or less (60 min), none for 72 (24 h)
Accuracy
Full marks within 2.2 °F of its reference, typically, none beyond 8.7 °F
Instrument checks
Full marks for no reading failed, none for 5 per cent or more
Forecast check
Full marks within 2 °F of the forecast on average, none at 8 °F
Rank
904of 979 in Michigan, Oct 16
Schedule
every 20 minon the hour's :00, :10, :30 and :50
Reports received, 24 hours
60 of 7283.3% of its schedule, 64 reports in all
Reports received, 7 days
399 of 50479.1% of its schedule, 432 reports in all
Days reported, 30 days
-
Longest silence, 7 days
1 h 40 minfrom Oct 11, 4:10 AM
Latest report
Oct 16, 7:10 AMlocal time
Time to reach Storm Station
23 min9 in 10 within 23 min
Against its reference, 30 days
+0.1 °Fwarmer than the airport station KAPN, 6.9 miles away, on average over 338 readings; typical difference 5.4 °F

From Storm Station's own record of every report it heard from this station.

Against its reference: each temperature this station reports is compared with the nearest airport or climate reference station that reported within half an hour, up to 15 miles away. The figure is its reading less the reference's, on average, as both were reported; the typical difference is the root mean square. The difference in height is shown where both heights are known.

Its schedule is one report every 20 min, 72 in 24 hours. Two reports in the same 20 min count as one received.

Chart of the 979 ranked stations in Michigan on Oct 16 by the share of their scheduled reports received in Storm Station's own record, up to 7 days, in tenths: 0 to 9 per cent, 1; 10 to 19 per cent, 7; 20 to 29 per cent, 23; 30 to 39 per cent, 1; 40 to 49 per cent, 51; 50 to 59 per cent, 128; 60 to 69 per cent, 37; 70 to 79 per cent, 64; 80 to 89 per cent, 94; 90 to 99 per cent, 242; 100 per cent, 331. Alpena Harbor Light, Alpena received 75.1 per cent, 379 of 504 scheduled reports, rank 904 of 979.WHERE IT RANKS IN MICHIGAN, Oct 16THIS ONE: 75.1%, 379 OF 504, RANK 904 OF 979PER CENT OF SCHEDULED REPORTS RECEIVEDIN STORM STATION'S OWN RECORD, UP TO 7 DAYS1101000 to 9110 to 19720 to 292330 to 39140 to 495150 to 5912860 to 693770 to 796480 to 899490 to 99242100331STATIONS, LOG SCALE
Chart of Alpena Harbor Light, Alpena's rank in Michigan by how it reported, day by day, from 2026-10-11 to 2026-10-16: 2026-10-11 rank 976 of 976; 2026-10-12 rank 963 of 964; 2026-10-13 rank 959 of 961; 2026-10-14 rank 954 of 975; 2026-10-15 rank 929 of 984; 2026-10-16 rank 904 of 979.ITS RANK IN MICHIGAN, DAY BY DAYRANK, FIRST AT THE TOP12505007501,000Oct 11Oct 12Oct 13Oct 14Oct 15Oct 16
The ranking these charts were drawn from, as tables
Share of scheduled reports receivedStations
100%331
90 to 99%242
80 to 89%94
70 to 79%64
60 to 69%37
50 to 59%128
40 to 49%51
30 to 39%1
20 to 29%23
10 to 19%7
0 to 9%1
DayRankStations rankedShare received
Oct 16, 202690497975.1%
Oct 15, 202692998462.8%
Oct 14, 202695497550.7%
Oct 13, 202695996138.2%
Oct 12, 202696396425.9%
Oct 11, 202697697614.0%

Station report

Alpena Harbor Light, Alpena, 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.

1The sun

Contents

On Oct 16 the noon sun stands 36 degrees above the horizon at 45.06 N, and the day is 10 h 46 min long. Level ground there takes 59 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Alpena Harbor Light, Alpena, angles true: on Oct 16 it stands 36 degrees above the horizon, against 68 at the June solstice, 45 at the equinoxes and 22 at the December solstice; the day is 10 h 46 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NDBC-APNM4FIG. E THE SUN AT ALPENA HARBOR LIGHT, ALPENAELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 68°EQUINOXES 45°DECEMBER SOLSTICE 22°OCT 16, 36°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 46 MINLEVEL GROUND TAKES 59 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 45.06 N; THE SUN'S DECLINATION -9.1°TITLEAlpena Harbor Light, Alpena, the sunSTATION REPORT · DCP NDBC-APNM4TYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 1 of 2DATE2026-10-16IDSR-NDBCAPNM4-1DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

2The instrument

Contents

A data collection platform. Its sensors, as its network builds them.

Elevation of a data collection platform, Alpena Harbor Light, Alpena, each sensor drawn and labelled with what it read: no reading in the last day.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NDBC-APNM4FIG. F THE INSTRUMENTELEVATION OF A DATA COLLECTION PLATFORM, EACH SENSOR WITH WHAT IT READANTENNA, SENDING BY SATELLITE-AIR TEMPERATURE-PRECIPITATION GAUGE-SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALETITLEAlpena Harbor Light, Alpena, the instrumentSTATION REPORT · DCP NDBC-APNM4TYPEELEVATIONSCALESCHEMATICREVFROM THE REGISTER SHEET 2 of 2DATE2026-10-16IDSR-NDBCAPNM4-2DRAWN AS linework on paperSOURCES FB-INS-001

From the Field Book

The instrumentWhat an instrument is FB-INS-001

What it seesMoon and tides FB-CLK-003Hurricane FB-EVT-043Nor'easter FB-EVT-066Flash flood FB-EVT-100Coastal flood FB-EVT-105

Near Alpena Harbor Light, Alpena

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