Regional Weather Maps

About this map:
Both high and low temperature extremes can be harmful to humans and animals. Use this map to take the proper precautions when extreme conditions exist.
Relative Humidity  
About this map:
Humidity or relative humidity measures the amount of water vapor in the air relative to the temperature. It is important in weather because humidity affects how humans feel. A hot, humid day feels hotter because we cannot sweat as effectively. A cool, dry day feels colder because moisure evaporates more easily. Use this map to determine the relative humidity for your area.
 Wind Speed & Direction

About this map:
Wind affects our environment in many ways.
Wind speed and direction play a role in our own comfort level, in drying conditions of our soil and can be a real danger when it reaches an extreme level.
Use this map to determine wind direction and speed and to help forecast possible adverse conditions for your area.
Precipitation Amounts for the Last 24 Hour Period  
About this map:
Precipitation comes in a variety of forms and can be both beneficial and hazardous.
Use this map to view local precipitation amounts for the last 24 hour period.


Heat Index

About this map:
The Heat Index is a measure of relative discomfort due to combined heat and high humidity. It was developed by R.G. Steadman (1979) and is based on physiological studies of evaporative skin cooling for various combinations of ambient temperature and humidity. As temperatures climb above 90 °F and humidity goes above 40 percent, conditions are ripe for heat-related illnesses. Use this map to determine when possible dangers exist due to the heat index.
  Dew Point
About this map:
Dew point is the temperature to which air must be cooled for saturation to occur. The dew point is an important measurement used to predict the formation of dew, frost, and fog. Dew point is also a good indicator of the air's actual water vapor content, unlike relative humidity, which takes the air's temperature into account. High dew point indicates high vapor content; low dew point indicates low vapor content. In addition a high dew point indicates a better chance of rain and severe thunderstorms. Use this map to determine the dew point for your area and to help predict possible changes in your climate.
 Jet Stream Pattern 
About this map:
The jet stream is a narrow band of air that moves around the earth at relatively high speeds.
Speeds in a jet can reach close to 200 miles per hour with wind directions flowing from west to east.
How Do Jet Streams Form?
Warm air masses in the south meet cool air masses from the north and create temperature and air pressure gradients. Essentially, you can compare a "gradient" to a hill on a ski trip. The steeper the hill, the faster you will reach the bottom due to a large difference in the grade of that hill. In wind speed, the pressure difference between a high and low pressure zone can be very large, thereby creating high winds. Pressure and temperature differences in the jet stream can be large as a global warm front from the south and a cold front from the north meet.
What Does the Jet Stream Do?
In the winter, areas in the Northern Hemisphere may get colder than normal periods as the jet stream dips "lower" bringing cold air in from the polar regions. Although the height of the jet stream is typically 20,000 feet or more, the influences on weather patterns can be substantial as well. High wind speeds can drive and direct storms creating devastating droughts and floods.
Use this map to help determine the jet stream patterns for your local area.
  Current Fronts 
About this map:
A weather front is a boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena. In surface weather analyses, fronts are depicted using various colored lines and symbols, depending on the type of front. The air masses separated by a front usually differ in temperature and humidity. Cold fronts may feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by stratiform precipitation and fog. The weather usually clears quickly after a front's passage. Some fronts produce no precipitation and little cloudiness, although there is invariably a wind shift.

Cold fronts and occluded fronts generally move from west to east, while warm fronts move poleward. Because of the greater density of air in their wake, cold fronts and cold occlusions move faster than warm fronts and warm occlusions. Mountains and warm bodies of water can slow the movement of fronts. When a front becomes stationary, and the density contrast across the frontal boundary vanishes, the front can degenerate into a line which separates regions of differing wind velocity, known as a shearline. This is most common over the open ocean.
Weather map symbols:
1. cold front
2. warm front
3. stationary front
4. occluded front
5. surface trough
6. squall/shear line
7. dry line
8. tropical wave

A surface weather analysis is a special type of weather map which provides a view of weather elements over a geographical area at a specified time based on information from ground–based weather stations.  

Weather maps are created by plotting or tracing the values of relevant quantities such as sea-level pressure, temperature, and cloud cover onto a geographical map to help find synoptic scale features such as weather fronts.

Surface weather analyses have special symbols which show frontal systems, cloud cover, precipitation, or other important information. For example, an H may represent high pressure, implying fair weather. An L on the other hand may represent low pressure, which frequently accompanies precipitation. Various symbols are used not just for frontal zones and other surface boundaries on weather maps, but also to depict the present weather at various locations on the weather map. In addition, areas of precipitation help determine the frontal type and location.

Use this map to determine the current movement of fronts in your local area.

 About this map:
This visibility map shows the approximate visibility range in both miles and kilometers.
Use this map to determine the approximate visibility range for your local area.