Product Description
Abstract: These polygon shape files depict areas where thunderstorm activity is forecast to occur during each of the next 1, 2, …, 23 hours. The forecasts are created by DTN meteorologists, and are updated every hour.
Purpose: These shapefiles can be used for flight planning, airport and helicopter operations, and other applications impacted by the presence of thunderstorms.
Description: These polygon shape files depict areas where thunderstorm activity is forecast to occur during each of the next 1, 2, …, 23 hours. The forecasts are created by DTN meteorologists, and are updated every hour. The forecasts cover North America from Southern Canada south to the Gulf of Mexico. The polygons are contoured by the coverage of convection (thunderstorms) into four aviation categories. Each hourly shape file can be thought of as a forecast of the expected coverage of radar echoes from thunderstorms: (i) None (No thunderstorms expected), (ii) Isolated (less than 5% of the area covered), (iii) Occasional (Less than 25% of the area covered), (iv) Frequent (25% or more of the area covered).
Product Specification
Shapefile Name: CONV??yymmddhh
Fields. Features in this product have the following attributes:
| Name | Type | Format | Description |
|---|---|---|---|
|
PolygonNum |
Number (3) |
n/a |
Polygon identification number |
|
ValidTime |
String (19) |
mm/dd/yyyy hh:mm:ss |
Model forecast valid time (GMT) |
|
ModelTime |
String (19) |
mm/dd/yyyy hh:mm:ss |
Model run time (GMT) |
|
TotalPts |
Number (4) |
n/a |
Total number of polygon vertices |
|
Latitude |
Number (14) |
decimal degrees |
Recommended location of contour label |
|
Longitude |
Number (14) |
decimal degrees |
Recommended location of contour label |
|
TStormCode |
Number (6) |
Convective Activity Code categories; see ConvCode table |
|
|
Tstorm |
String (10) |
n/a |
Convective activity code description |
GeoDatabase Specification
Spatial Table Name: CONV
Views. The following spatial views are available on this spatial table:
| Microsoft SQL Server | Oracle |
|---|---|
|
CONV_View FcstConv_View FcstConvNow_View FcstConvNowPlusAll_View FcstConvNowPlus01_View FcstConvNowPlus02_View FcstConvNowPlus03_View |
CONV_View |
Columns. Features in this spatial table have the following attributes:
| Name | ArcSDE Data Type |
|---|---|
|
PolygonNum |
Integer |
|
ValidTime |
String(20) |
|
ModelTime |
String(20) |
|
TotalPts |
Integer |
|
Latitude |
Double |
|
Longitude |
Double |
|
TStormCode |
Integer |
|
TStormDesc |
String(10) |