Air Weather Service
The US Air Force Air Weather Service (AWS) provides operational weather service support, as described in AR 115-10 and AFR 105-3. A supporting Air Force weather unit will be assigned to all corps and divisions and to separate brigades, regiments, and groups on request. Assignment is subject to the following:
- When requested in peacetime in accordance with AR 115-12 and in
wartime as stated in contingency, mobilization, and war plans.
- When it is jointly agreed that remote weather service will be
- When consistent with jointly agreed tactical doctrine and operational support concepts.
SWOs can provide the following services:
- Weather observations. Under field conditions, the SWO will not
be able to establish a dense observational network. There will
usually be areas of concern for which no observations are
available. Therefore Army personnel should also be prepared to
provide supplemental observations to the AWS weather unit. The
SWO also should have access to observations and upper air
soundings from artillery meteorological (arty met) units to
further supplement weather collection efforts.
- Forecasting services. These services, which can vary
considerably, are provided according to local arrangements
with the SWO.
- Criminological data (weather history). This planning information can be obtained from the SWO. Those units without an SWO should obtain it from the USAF Environmental Technical Applications Center, Scott AFB, IL 62225 (see DA Pamphlet 115-1).
AWS operational support products are defined in terms of long-range planning (usually beyond 48 hours), mission planning (usually 24 to 48 hours), and execution support (usually 0 to 24 hours). For forecast periods in excess of five days, climatological analyses normally are provided. (NOTE: The forecast reliability decreases and the forecast provided becomes less specific as the forecast period increases. Significant changes or modifications may occur after the forecast is issued. The requestor must then inform the AWS facilities of the criteria for significant changes.
The following observation and forecast parameters and elements are normally available; however, additional products may be provided, depending on Army stated requirements and the AWS's ability to satisfy those requirements:
- Sky conditions, including amounts (tenths in CONUS and eighths
overseas), type (according to standard classification), and cloud
base height (in feet).
- Precipitation and/or obstructions to visibility, including
intensity, type, and times of beginning and ending (in
coordinated universal time and zone Z).
- Surface visibilities in statute miles and fractions.
- Surface wind direction and speed.
- Surface temperature.
- Temperatures and winds at desired standard levels above the
- Time period for the forecast and desired delivery time.
- Target or area to be covered by the forecast. Clearly identify
an area by map coordinates, aerial photograph grid numbers, or
established geographic boundaries.
- Special elements or conditions to be covered.
- Criteria for changes (amendments) in the forecast if desired.
The target analyst should also evaluate forecasts received. The analyst should use a detailed reconnaissance map, an aerial photograph, or a mosaic or study of the terrain and vegetation in and around these areas and those that might affect the behavior of the agents to be released.
After the operation, the NBC officer should pass to the intelligence officer, SWO, or AWS facility information on adequacy of support and any problems encountered. This information aids AWS forecasters in better tailoring future support.
Using agencies receive weather information in five general types of reports-weather forecasts, current weather observation reports, weather summaries, climatic summaries, and climatic studies.
A weather forecast is a prediction of weather conditions at a point, along a route, or within an area for a specified period. The accuracy and reliability of weather forecasts depend upon factors such as characteristics of the forecast area, age of the data available, reliability of weather communications facilities, length of the forecast period, state of meteorological science, and experience of the forecaster. The reliability and specificity of forecasts generally decreases as the forecast period increases. Also, the forecast becomes less specific as the forecast period increases.
Routine weather forecasts for use by troop units should be in plain language and should be as accurate as possible. Forecasts are Air Weather Service operational support products. These forecasts are defined in terms of long-range planning (usually beyond 48 hours), mission planning (usually 24 to 48 hours), and execution support (usually 0 to 24 hours). Figures A-1 and A-2 provide an example of a sample forecast containing information elements that could be provide by Air Weather Service or Fleet Weather Service and supporting artillery meteorological sources.
Current weather observation reports are oral, written, or graphic representations of existing weather conditions or specific weather elements. These reports are used in the operation of aircraft; in the employment of nuclear weapons, chemical agents, and smoke; and in other activities.
A weather summary describes the weather along a route or within an area during a specified recent period. Weather summaries are used in analyzing the effects of weather on recent operations. These summaries are also used in estimating the effects of weather on future operations.
Climatic summaries tabulate averages, extremes, and frequencies of weather elements or phenomena. These cover a specified period-a year, season, or month-and a given point, along a route, or within an area.
Climatic studies are analyses and interpretations of climatic summaries. Corps and higher headquarters usually prepare these studies. At the request of the intelligence officer the supporting AWS unit prepares or obtains climatic studies on specific problems for given areas.
Care must be taken to understand the meanings of the technical terms used in this manual. Some of these terms have a strict technical definition that may be different from the definitions many laymen understand.
Field behavior of NBC agents and smoke depends upon weather variables, which are wind, temperature, vertical temperature gradients, cloud cover, humidity, and precipitation. Local topography, vegetation, and soil affects these variables. The cumulative effect of these variables governs the required quantity and optimum type of chemical agent and smoke best suited to achieve operational objectives. Since weather governs the transport of chemical agents and smoke clouds, it is a primary factor in determining the effectiveness of a specific agent and the extent of the hazard area.
You must understand the basic principles governing weather and have access to accurate forecasts to be able to use chemical agents effectively or to defend against their use by the enemy. You must be capable of using the data provided in weather forecasts and predictions in preparation of plans and estimates. Appendix C discusses weather elements and primary weather factors in further detail for you to work with your forecaster on how best to employ chemical agents, smoke, and other obscurants, or defend against NBC agent use.
Figure A-1. Sample forecast format (front).
Figure A-2. Sample forecast format (back).
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