HazardRecovery

Procedure to re-initialize your Hazard grid based on current events

March 8, 20012

Methodology

Hazard recovery should only be used in case your entire hazard grid is lost or mangled by so many changes that you cannot recover. Attempt to restore from your official database first, if it's current.

The HazardRecovery procedure will analyze the VTEC active table to determine what hazards are in effect for your forecast area. It will then convert the hazards found in this table to gridded format in your hazard grid. When restored all hazards will be depicted by zone or county only.

To run the hazard recover procedure, select the Hazards menu, the select HazardRecovery.

HazardRecovery Menu Image

After selecting HazardRecovery, a warning dialog will display.

Hazard Recovery Warning Image

Upon selecting Ok, your entire Hazards grid will be deleted, and replaced with the current hazards found in the active table.

How It Works

The Hazard Recovery tool calculates the current set of Hazards in effect (i.e., issued). It uses the following algorithm:

The VTEC active table is retrieved from EDEX.
The table is filtered and actions that are CAN, UPG, and EXP are removed.
Records that represent current events are kept. Current events are obtained from three different sources (within the VTEC table):

Convective Watches (TO.A, SV.A) from "my" site from "my" WCN are considered the current issued convective watches. We ignore the WOU and other information from SPC. Convective watches from "my" site but from a different product are ignored.
Any records from "my" site are considered, both tropical and non-tropical.
Tropical Cyclone Watches/Warnings (HU, TY, TR) from TPC (which only contain coastal zones) are added.

The procedure then removes all Hazard grids, and then creates the hazards based on the calculated active events and puts them into the Hazards grid.

Note: The HazardRecovery tool only recovers events that are compatible with the current GFE mode. If the GFE mode is operational, then only "X", "O", and "E" VTEC events will be considered. If the GFE mode is "TEST", then only "T" VTEC events will be considered.

Note: HazardRecovery has been updated for the 2007 tropical season due to changes in the TCV product. The TCV product will now only contain coastal zones, thus the HazardRecovery procedure now looks at tropical events issued by your site.