A major redesign of the meteoblue Android app introduces a modern interface while preserving the key features users rely on.
Heatwaves are among Europe's most significant weather hazards, affecting millions of people as well as infrastructure, agriculture, and energy systems. But what actually causes a heatwave? Why do some persist for days or even weeks? And how do meteorologists forecast them?
During the night and in the first hours of the day clear skies prevail, but for this afternoon there is a chance of thunderstorms and local showers. It is a sunny day. The forecast has a moderate, 40% chance of Precipitation. Temperature highs are likely to reach 100 °F. With a UV-Index as high as 9 make sure to properly protect your skin. During the night and in the morning light air is noticeable (1 to 4 mph). For the afternoon blows a light breeze (4 to 8 mph). Gusts to 17 mph are possible. Winds blowing at night and in the morning from Northwest and during the afternoon from Southwest. The weather forecast for Hempstead for Friday can be accurate in parts but deviations are expected. Check again for latest updates.
Pressure: 1013 hPa
Timezone: EDT (UTC -04:00h)
By comparing today's temperatures to 40 years of historical data we can see whether today's forecast is unusually warm (red areas) or cold (blue areas). Coloured dots show observed actual temperatures from professional and private weather stations.
The location marker is placed on Hempstead. This animation shows the precipitation radar for the selected time range, as well as a 2h forecast. Orange crosses indicate lightning. Data provided by nowcast.de (available in USA, Europe, Australia). Drizzle or light snow fall might be invisible for the radar. Precipitation intensity is colour coded, ranging from turquoise to red.
You can embed this meteogram into your own website. Customize it here.
The real-time satellite image combines visible light during daytime with infrared radiation during nighttime. At night, the image is not dark as infrared radiation can detect temperature differences. Unfortunately, low clouds and fog are difficult to distinguish from ground temperatures and thus can be almost invisible during the night. Meteosat satellite images for Europe are updated in real-time every 5 minutes. GOES-16/GOES-17 (North & South America) and Himawari (Asia) images update every 10 minutes.
Precipitation is estimated from radar and satellites. Precipitation estimates from satellites are less accurate at night than during daytime.
© 2026 meteoblue, NOAA Satellites GOES-16 and EUMETSAT. Lightning data provided by nowcast.
A major redesign of the meteoblue Android app introduces a modern interface while preserving the key features users rely on.
Heatwaves are among Europe's most significant weather hazards, affecting millions of people as well as infrastructure, agriculture, and energy systems. But what actually causes a heatwave? Why do some persist for days or even weeks? And how do meteorologists forecast them?
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