Point-Click Point Forecasts - General Overview Back to Interactive Forecast Page

Three types of forecasts are available from the point-click Point forecast pages. All of the forecasts are gridpoint based, and prepared by National Weather Service forecasters. In most areas the grid resolution is 5km; however in mountaineous areas a finer resolution is used, usually 2.5km. Below is a description of the forecasts available in the interactive forecast pages, and how to use them.

1. 7-Day Text Forecasts

The 7-day text forecasts provide a text-based look at the forecast for the next 7 days. Near the top of the page a quick-glimpse of the weather is available, which provides a picture, a one or two word description of the expected weather, and the forecast high or low temperature.

Below this, an actual worded forecast is displayed with more detail. In addition, you will find any current watches, warnings, or advisories in effect listed here, along with current weather conditions, and links to more available weather information for the selected area.


2. Meteorograms

A meteorogram is an element-time look at weather conditions for the next 48 hours. If this forecast type is selected the user can also select which weather elements they would like to see the forecast for by selecting/de-selecting the weather element check boxes.

The following weather elements are presented in a linear format, tracing the changes on an hourly basis,

Temperature
Dewpoint
Relative Humidity
Sky Cover
Wind Chill (seasonal)
Heat Index (seasonal)
Wind Direction/Speed
Probability of Precipitation


Special note concerning wind speed and direction
In addition to the linear trace of the magnitude of the wind, the wind direction is also shown using what is called a "wind barb". The wind barb is always point in the direction that the wind is coming from. The magnitude of the wind on a wind barb is calculated using the attached flags at the end of the wind barb. A long wind flag is 10 mph, a short wind flag is 5 mph, and a triangle wind flag is 50 mph. So, if you see a wind barb with two long flags and one short flag on it, the forecast wind speed would be 25 mph.

The following weather elements are presented in bar graph format, giving the chances for each type of weather event categorically.

Rain
Thunder
Snow (seasonal)
Freezing Rain (seasonal)



3. Digital/Tabular

The digital/tabular forecast pages provide hourly forecast information in tabular format for weather conditions in the next 120 hours. If this forecast type is selected the user can also select which weather elements they would like to see the forecast for by selecting/de-selecting the weather element check boxes.

The following weather elements are presented in a tabular format on an hourly basis,

Temperature
Dewpoint
Relative Humidity
Sky Cover
Wind Chill (seasonal)
Heat Index (seasonal)
Wind Direction/Speed
Probability of Precipitation

Rain
Thunder
Snow (seasonal)
Freezing Rain (seasonal)



National Weather Service
Page last modified: December 2003

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