VisualRangeTendency
VisualRangeTendency
The tendency of visual range (e.g., upward, downward). Defined for the purposes of aviation meteorology reporting of the visual range on runways (WMO No. 49-2). If the [runway] visual range (RVR) values during the 10-minute period preceding the nominal observation time show a distinct upward or downward tendency such that the mean during the first five minutes varies by 100 metres or more from the mean in the second five minutes of the period, an UPWARD [U] or DOWNWARD [D] tendency is recorded. When no distinct change in RVR is observed, NO CHANGE [N] is recorded. When it is not possible to determine the tendency, MISSING VALUE is recorded. See WMO No. 306 Vol I.2 FM 94 BUFR code-table 0 20 018 Tendency of runway visual range"."
| Properties | Definition | Type |
|---|---|---|
| DOWNWARD | Downward (decreasing) tendency | - |
| MISSING_VALUE | Missing value | - |
| NO_CHANGE | No distinct change | - |
| UPWARD | Upward (increasing) tendency | - |
Details
VisualRangeTendency
VisualRangeTendency
The tendency of visual range (e.g., upward, downward). Defined for the purposes of aviation meteorology reporting of the visual range on runways (WMO No. 49-2). If the [runway] visual range (RVR) values during the 10-minute period preceding the nominal observation time show a distinct upward or downward tendency such that the mean during the first five minutes varies by 100 metres or more from the mean in the second five minutes of the period, an UPWARD [U] or DOWNWARD [D] tendency is recorded. When no distinct change in RVR is observed, NO CHANGE [N] is recorded. When it is not possible to determine the tendency, MISSING VALUE is recorded. See WMO No. 306 Vol I.2 FM 94 BUFR code-table 0 20 018 Tendency of runway visual range"."
DOWNWARD
VisualRangeTendency.DOWNWARD
Downward (decreasing) tendency
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
Notes
if used by a property that will be in a CR
MISSING_VALUE
VisualRangeTendency.MISSING_VALUE
Missing value
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
Notes
if used by a property that will be in a CR
NO_CHANGE
VisualRangeTendency.NO_CHANGE
No distinct change
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| CodeChangeIndicatorType.NOSIG | No significant changes are forecast with respect to the current meteorological conditions. |
UPWARD
VisualRangeTendency.UPWARD
Upward (increasing) tendency
Semantic Correspondence
| AIRM Concept | Definition |
|---|---|
| Change request | A change request is required on the AIRM. |
Notes
we have CodeConvectionCellTopVariationType specifically for convection cells, maybe we can make the Types more generic.