Calumet Harbor
Live NOAA readings, Lake Michigan, IL, station CMTI2
Calumet Harbor is reading 1 kt from the SW, gusting 3, measured 58 minutes ago.
Over the last 12 hours it has run 1–9 kt on the hour, and its strongest single reading was 10 kt 10 hours ago.
All readings
Knots, newest on the right, never interpolated — a gap is a gap in the record.
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CMTI2, the morning after, Mon 12 Oct
What last night's forecast was worth
Yesterday the Calumet Harbor meter topped out at 18.1 kt at 3 pm. The night before, NWS said 13 kt, Forecast Lab — what Premium is served — 11.8, the other 4 models 8.9–13.5 kt. That morning’s lake-breeze watch expected a lake breeze, and it came in at 18.1 kt from 11 am.
How this was measured
One day is an illustration, not a record — a model that reads low every day will still land one. The number that means anything is the scored one over 90 days, in how our calls are graded.
Each model row is the highest wind it forecast for the 6am–6pm window at this meter, taken from the freshest run that existed before midnight the night before — between 10 and 23 hours ahead, depending on the hour. A model with no run in that window shows no call; it is never filled in from a closer-range forecast. Raw rows are the provider's own numbers; NWS + this meter's bias is that forecast shaded by this station's own measured error. That correction is Premium: a Premium rider is served the corrected row, and a free or signed-out rider is served the raw NWS row above it. The meter's figure is the strongest reading of each hour from this station's stored observations. Hours over your floor are counted from those readings alone; rideable is the nightly scorer's verdict and also weighs gust, direction and waves, so the two numbers are not the same measurement and are never added. Knots throughout.
LAKE-BREEZE CALLS · CALUMET HARBOR
A lake breeze (thermal wind) is the onshore wind that fills in on a hot afternoon. No forecast model predicts it. WindStoke tells you the morning it’s coming, so you get more days on the water.
Yesterday the forecast had Calumet Harbor at 12 kt. We called the lake breeze that morning. It blew 18 kt.
- YesterdayCame in 11 am
- Sat Oct 10No lake breeze
- Fri Oct 9No lake breeze
- Thu Oct 8No lake breeze
- Tue Oct 6Came in 10 am
How this was measured
Called: our morning lake-breeze watch flagged that afternoon at Calumet Harbor. Came in: the wind at the meter (CMTI2) turned onshore and built. Forecast: the model forecast’s afternoon peak for the spot as of that morning (HRRR). Blew: the afternoon’s peak sustained wind at the meter. 10 kt is about the least you can ride, on a big kite or a foil. The 11 and 13 kt above are averages over the called days it showed. The last 5 calls are listed, misses included; 2 calls when the meter was down are left out. On the 18 mornings we stayed quiet, a lake breeze showed 4 times (every other graded morning, including the ones the watch saw primed but held back). Only spots where the call has beaten the quiet mornings get this card, and those are the spots it goes out from, by push or email.
CMTI2, where the wind comes from, 57 days
Which way the working wind blows here
55% of the hours over 12 kt came from NNE–ENE in the last 57 days, though the wind sat most often in the S — that is the lighter wind. The dark wedges are the ones to read.
How this was measured
Floor is the 12 kt default; set a wind floor on an alert here and the rose is cut at yours. Hours the meter read at or over the floor: 146 of 1,275 (11%). Over the floor at the meter is not a rideable hour: gust, your direction window and the meter's own siting are not in it.
One reading per hour, the hour's strongest sample, from this meter's own readings over the last 57 days. Sixteen sectors. The two roses are each drawn to their own total: a light wedge is that sector's share of ALL hours, a dark wedge its share of the hours at or over the floor, and the rings are marked in the dark set's percentages. They are two distributions, not one inside the other. Direction is where the wind blows FROM.