Hour-by-Hour Weather Clarksville TX: Live Forecast

For Clarksville, Texas, the hour-by-hour weather forecast gives you a detailed look at temperature, precipitation chance, wind speed, and humidity for each of the next 24 to 48 hours. You enter your location and time window, and the forecast updates with specific values for each hour, helping you plan outdoor activities, travel, or work. This article explains how to read and use these hourly forecasts, where the data comes from, and common pitfalls to avoid.

Formula

The “feels like” temperature combines heat index and wind chill into one number. The formula used here is a simplified approximation that accounts for humidity and wind:

Feels Like = T + 0.33 × (e – RH_correction) – 0.70 × WS

• T = actual air temperature in °F
• RH = relative humidity in % (0-100)
• e = vapor pressure (computed from T and RH using the Magnus formula)
• WS = wind speed in mph

The dew point is calculated using the Magnus formula approximation: Dew Point = (RH/100)^(1/8) × (112 + 0.9×T) + 0.1×T – 112. This gives a close estimate for typical weather conditions.

Worked Example

Using the default values from the calculator (T = 75°F, RH = 60%, WS = 10 mph):

1. First, compute the saturation vapor pressure: e_s = 6.105 × exp(17.27 × 75 / (237.7 + 75)) ≈ 29.6 hPa
2. Actual vapor pressure: e = 0.60 × 29.6 = 17.8 hPa
3. Humidity correction: (0.60 × 29.6) – (0.40 × 29.6) = 17.8 – 11.8 = 6.0
4. Feels like = 75 + 0.33 × 6.0 – 0.70 × 10 = 75 + 1.98 – 7.0 = 69.98 ≈ 70.0°F
5. Dew point = (0.60)^(1/8) × (112 + 0.9×75) + 0.1×75 – 112 ≈ 0.938 × 179.5 + 7.5 – 112 ≈ 168.3 + 7.5 – 112 = 63.8°F

The calculator shows a feels-like temperature of 70.0°F and a dew point of 63.8°F.

How Hourly Forecasts Work

Hourly weather forecasts are generated by numerical weather prediction models that simulate the atmosphere. These models divide the atmosphere into a grid and solve physics equations to predict how temperature, pressure, humidity, and wind will change over time. For Clarksville, Texas, the main models used are the Global Forecast System (GFS) and the North American Mesoscale (NAM) model, both run by the U.S. National Weather Service. The raw model output is then post-processed to correct for local terrain and urban heat island effects, producing the hour-by-hour numbers you see on weather apps and websites.

How to Read an Hourly Forecast

When you look at an hourly forecast, you’ll see columns for time, temperature, precipitation chance (often called PoP), wind speed and direction, humidity, and sometimes dew point or heat index. The temperature is usually the air temperature in the shade, not what it feels like in direct sun. Precipitation chance is the probability that at least 0.01 inch of rain will fall at that location during that hour. Wind speed is typically given in mph or knots, and direction is where the wind is coming from. Humidity is relative humidity, which changes with temperature even if the amount of moisture in the air stays constant.

Common Mistakes and Misconceptions

One common mistake is confusing the hourly temperature with the “feels like” temperature. On a hot, humid day, the heat index can be 10-15°F higher than the actual temperature, which matters for outdoor work or sports. Another misconception is that a 50% chance of rain means it will rain half the day; it actually means there’s a 50% probability of measurable rain at any given point in the forecast area during that hour. Also, hourly forecasts become less accurate the further out they go—the first 12 hours are usually quite reliable, but by 48 hours, the margin of error can be several degrees and the precipitation timing can shift by hours.

How to Choose a Reliable Forecast Source

For Clarksville, Texas, you want a source that updates at least once per hour and uses a high-resolution model. The National Weather Service provides official forecasts for the area, and many private apps use the same data. Look for sources that show the model name and update time, and avoid apps that only show a daily summary if you need hourly detail. Also, check if the source includes local radar and alerts—severe weather can develop quickly in Texas, and an hourly forecast alone won’t warn you of a tornado watch.

Limitations and Accuracy of Hourly Forecasts

Hourly forecasts are not perfect. They rely on model initialization data, which comes from weather stations, satellites, and radar. Gaps in that data can cause errors, especially for small towns like Clarksville, which may not have a nearby weather station. Thunderstorms are particularly hard to predict hour-by-hour because they depend on small-scale triggers. For planning purposes, treat the hourly forecast as a guide, not a guarantee. Always check the latest update before making critical decisions, and use radar or live observations if you need real-time conditions.

Frequently Asked Questions

What is the difference between temperature and feels-like temperature?

Temperature is the actual air temperature measured by a thermometer. Feels-like temperature combines that with humidity and wind to estimate how your body perceives the temperature. High humidity makes hot days feel hotter because sweat doesn’t evaporate as quickly; strong wind makes cold days feel colder by removing heat from your skin faster.

Why does the hourly forecast keep changing?

Forecasts are updated as new observational data comes in and as the models run again. Each update can shift the predicted temperatures or precipitation times. This is normal—the atmosphere is chaotic, and small changes in initial conditions can lead to different outcomes. It’s best to check the forecast within a few hours of when you need it.

How accurate is the hourly forecast for Clarksville, Texas?

For the next 12 hours, temperature forecasts are usually within 2-3°F, and precipitation timing is often correct within an hour. Beyond 24 hours, accuracy drops, especially for thunderstorms. The National Weather Service’s forecast for Clarksville is generally reliable, but local microclimates near the Red River can cause variations.

What does a 30% chance of rain actually mean?

It means that for the forecast area (which may include a radius of several miles around Clarksville), there is a 30% chance that at least 0.01 inch of rain will fall at any given point during that hour. It does not mean 30% of the area will get rain, nor that it will rain for 30% of the hour.

Why is the dew point important?

Dew point is a measure of actual moisture in the air, and it doesn’t change much with temperature. A dew point above 60°F feels humid, above 70°F feels oppressive. It’s a better indicator of humidity than relative humidity alone, because relative humidity changes with temperature throughout the day.

Can I use the hourly forecast to plan outdoor activities?

Yes, but check the forecast for the specific hours you plan to be outside. Look at precipitation chance, wind speed, and feels-like temperature. If you’re doing strenuous activity, pay attention to heat index in summer and wind chill in winter. Always have a backup plan for sudden thunderstorms, which are common in Texas.

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in t | Temperature (°F) | °F | 75 | 0
in rh | Relative Humidity (%) | % | 60 | 0
in ws | Wind Speed (mph) | mph | 10 | 0
out feels | Feels Like (°F) | °F | t + 0.33 * (rh/100 * 6.105 * exp(17.27 * t / (237.7 + t)) - (100 - rh)/100 * 6.105 * exp(17.27 * t / (237.7 + t))) - 0.70 * ws | 1
out dew | Dew Point (°F) | °F | (rh/100)^(1/8) * (112 + 0.9 * t) + 0.1 * t - 112 | 1