Speci: Aviation regular weather reports and selected special weather reports provide information on the current inclement weather at an airport. Every hour, the most common sort of observation is the METAR. The data set for a METAR contains the airport ID, the time of observation, the wind, the visibility, the runway visual range, the current weather conditions, the visual observation, the weather, the dew point, and the elevation setting. The METAR and SPECI can be read by learning more about them.
A speci criteria may indicate that the weather at your location is improving or that you’re likely to encounter difficult weather. Whatever the case may be, the word “SPECI” should immediately catch your eye. Spend some time examining weather patterns at your destination and neighboring airports because of the rapid change in conditions. It’s a warning sign that you might have to reroute.
Unscheduled weather reports are called Aviation Selected Special Weather Reports. In addition to the plain English information available in METARs, SPECIs contains all the data items found in METARs. Fortunately, the coding for METARs and SPECIs is the same. Following is the report on speci aviation. Meteorologists can tell them apart by beginning their weather reports with either the abbreviation METAR or SPECI.
Criteria for Issuance of SPECI Documents:
Reasons for issuing a SPECI fall into 12 broad categories, each of which has multiple subcategories. Understanding the general pattern is more important than memorizing the specifics of each one. Take a peek at nearby airports or past reports to see whether the weather has improved or worsened.
A SPECI report causes a missed approach:
Another useful indicator of an airport’s IFR status is by looking at its specific indicator (or SPECI). In the figure above, you may have observed that SPECIs are issued when the visibility drops below 1,000 feet or three miles.
Speci metar meaning:
The term “Speci metar meaning” refers to a weather report broadcast regularly, either every hour or every half hour. It is a report on the weather conditions at a specific airport. In the case of severe weather, a special weather report may be issued if the surface gusts. As with the METAR, SPECI reports follow a similar format and use the same components. The following is typical of a METAR/SPECI report:
Information on originating:
Information on the originating airport, the time the METAR/SPECI was issued, the speed and directions of the wind, the variation in wind direction, the visibility of the runway, and the weather at the time of the observation.
9999 means 10 kilometers or more, 7000 means 7 kilometers, while 0000 means less than 50 meters. These documents offer a wide range of data that pilots can consult while in the air and for use in flight preparation. The Alternate Minima is also discussed in this section.
CAVOK stands for “clear skies and visibility.”
The International Maritime Organisation adopted a new definition of nighttime visibility on November 1, 2001, which includes the greatest distance at which light in the area of 1000 laser designators may be seen and differentiated against an unlit background.
Aerodrome Weather Reports (SPECI) is provided when the weather is above or below a predetermined threshold. Chapter 6, Tables 6.1 and 6.2, in the Aeronautical Services Handbook, detail these standards. It is not unusual for a Meteorological Office and AWS to release additional SPECI reports between their normal reporting hours during ‘adverse’ weather conditions.
SPECI criterion thresholds apply to most weather conditions in an Aerodrome Weather Report. The procedures for issuing SPECI reports due to cloud and visibility at aerodromes are based on the Highest Alternate Minima protocols (HAM). The Alternate Minima for an airfield are meteorological conditions that could impose operational constraints on aircraft operations at that specific site.
Speci metar example
It may be necessary for an airplane to carry additional fuel to “hold” for a predetermined amount of time, or possibly enough fuel to fly to a different airport where the weather is better. The Alternate Minima can be different in different airports and on different aircraft. The ‘Highest’ Alternate Minima for an observer’s position must be known when providing Aerodrome Weather Reports as speci metar example. Both the Bureau of Meteorology and Air services Australia have provided this information.
Some areas continue to use these upgraded observations, which are recorded by digital sensors, encoded by algorithms, and then checked by expert weather observers or forecasters before being aired on the radio or television to check speci validity.
Speci vs. metar:
This booklet aims to explain the METAR in greater detail and provide examples of the various codes. To make sure you’ve grasped the gist of this new code, we’ve included an exercise. The international meteorological code METAR designates aircraft regular weather reports. On the hour, METAR measurements are often taken and broadcast. An aviation-selected special weather report will be issued when significant weather changes are noted. Computer software generates speci vs. METAR reports based on hourly or special observations made at either staffed.
Ten minutes after progress has been maintained, Clearing SPECI is issued. Measuring the improvement overtime is done using MetConsole/WebConsole, but it is logged as a METAR on the A37 Register. Any changes to the initial conditions should be documented.
Speci are often generated by airports or other long-term weather monitoring facilities. A special report is generated when conditions change dramatically; however, most stations only generate these once per hour or half-hour. Some METARs are encoded by continuous temperature readings taken at airports, airbases, and other locations worldwide. Trained observers or forecasters can also make observations, but they must first observe and process their results manually once they’ve been broadcast.
What exactly are we talking about when we talk about a SPECI?
A SPECI is a form of METAR sent out when the weather conditions indicated in the most recent METAR have changed significantly.
The SPECI is issued when?
In the event of a major change in the METAR, a SPECI is issued. An aviation mishap has happened, or a hazardous meteorological scenario requires immediate attention to the weather.
Is the SPECI’s degree-based reading of wind direction accurate?
In METARs and TAFs, the wind speed is given in degrees of accuracy.