StormlinesStorm tracks, explained
Nerd mode: every forecast, readouts, filters and range & bearing for weather enthusiasts

Sections

View
Nerd mode: every forecast, readouts, filters and range & bearing for weather enthusiasts

This week’s weatherRotterdam, Netherlands

Rain is likely in Rotterdam on Tuesday

9 in 10 of NOAA’s 31 GEFS forecasts bring measurable rain to Rotterdam Tue 2–8 a.m. CEST.

NOAA GEFS, 31 forecasts · Mon 28 Sep 18Z run · updated Tues., Sept. 29, 1:03 a.m. CEST · times are Rotterdam’s (CEST)

See it on the globe For warnings, follow your national weather service.

Quick answers

Will it rain in Rotterdam this week?
The best chances of measurable rain: Tuesday (9 in 10 forecasts, 2–8 a.m.); Wednesday (nearly all forecasts, 8 p.m.–2 a.m.); Thursday (7 in 10 forecasts, 2–8 a.m.). Drier: Fri, Sat, Sun (fewer than 2 in 10 forecasts in any six hours). Times are CEST.
How much rain will Rotterdam get this week?
By Mon., Oct. 5, 8 p.m. CEST (the end of the forecast), the middle forecast has 7.9 mm of rain and melted snow, counting from Tue 2 a.m. 4 in 10 forecasts bring 13 mm or more in total.
How windy will it get in Rotterdam?
No strong gusts: fewer than 1 in 10 forecasts have gusts over 48 km/h at any of the six-hourly times. The middle forecast’s strongest gust is 37 km/h, Wed 2 a.m. Checked every six hours, so a brief peak can fall between.
How warm or cold will it be in Rotterdam?
At the six-hourly times, the middle forecast runs from 12°C (Mon., Oct. 5, 8 a.m.) to 24°C (Tue 2 p.m.) CEST. The day’s real high and low can fall between those times.
Are any storms heading for Rotterdam?
No storm Stormlines tracks has 1 in 10 forecasts passing its centre within 160 kilometres of Rotterdam this week.

Chance of rain, six hours at a time

Tue 2–8 a.m.: 9 in 10 forecasts with measurable rain; middle forecast 1.1 mmTue 8 a.m.–2 p.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneTue 2–8 p.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneTue 8 p.m.–2 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneWed 2–8 a.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneWed 8 a.m.–2 p.m.: 2 in 10 forecasts with measurable rain; middle forecast almost noneWed 2–8 p.m.: 7 in 10 forecasts with measurable rain; middle forecast 0.4 mmWed 8 p.m.–2 a.m.: nearly all forecasts with measurable rain; middle forecast 2.1 mmThu 2–8 a.m.: 7 in 10 forecasts with measurable rain; middle forecast 1.0 mmThu 8 a.m.–2 p.m.: 5 in 10 forecasts with measurable rain; middle forecast 0.3 mmThu 2–8 p.m.: 4 in 10 forecasts with measurable rain; middle forecast almost noneThu 8 p.m.–2 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneFri 2–8 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneFri 8 a.m.–2 p.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneFri 2–8 p.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneFri 8 p.m.–2 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneSat 2–8 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneSat 8 a.m.–2 p.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneSat 2–8 p.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneSat 8 p.m.–2 a.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneSun 2–8 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneSun 8 a.m.–2 p.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneSun 2–8 p.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneSun 8 p.m.–2 a.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost noneMon 2–8 a.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneMon 8 a.m.–2 p.m.: 1 in 10 forecasts with measurable rain; middle forecast almost noneMon 2–8 p.m.: fewer than 1 in 10 forecasts with measurable rain; middle forecast almost none

Each bar is the share of the 31 forecasts with measurable rain or melted snow in that six hours; the darker the bar, the more forecasts agree. Local days, CEST.

The week, day by day

DayChance of rain2.5 mm or moreTotal by day’s endStrongest gustTemperature
Tue 299 in 10<1 in 101.1 mm · <1 in 1029 km/h16°C–24°C
Wed 30nearly all5 in 104.9 mm · <1 in 1037 km/h18°C–24°C
Thu 17 in 103 in 107.9 mm · 3 in 1021 km/h15°C–19°C
Fri 2<1 in 10<1 in 107.9 mm · 3 in 1010 km/h12°C–19°C
Sat 31 in 10<1 in 107.9 mm · 4 in 1017 km/h13°C–19°C
Sun 41 in 10<1 in 107.9 mm · 4 in 1019 km/h12°C–19°C
Mon 5 (part)1 in 10<1 in 107.9 mm · 4 in 1019 km/h12°C–19°C

Chances are the highest in any six hours of the day. “Total by day’s end” is the middle forecast’s running total since Tue 2 a.m., and the share of forecasts with 13 mm or more by then; totals aren’t added up day by day, because the middle forecast of each day isn’t the same forecast. Gusts and temperatures are read every six hours.

Storms near Rotterdam

No storm Stormlines tracks has 1 in 10 forecasts passing its centre near Rotterdam this week. Every storm we’re tracking →

About these numbers

They come from one source, NOAA’s Global Ensemble Forecast System (GEFS): 31 runs of the same model, each started slightly differently, read at Rotterdam’s coordinates on a grid about 55 km (35 miles) apart. “8 in 10 forecasts” means 8 in 10 of those runs. Nothing is adjusted for local effects such as coasts, lakes, hills or city heat, so the numbers can differ from your local official forecast, especially for snow and showers.

“Measurable rain” counts rain or melted snow in a six-hour period. Not an official forecast: follow your national weather service for warnings and decisions. How the forecasts are read: how to read the maps and the glossary.

Other cities →