National Weather Service United States Department of Commerce
  1. Choose the type of warning you want to extend
    Flash Flood, Non-convective/Dam Break Flash Flood, Areal Flood Warning, Areal Flood Advisory, Flash Flood/SVR combined (WR only)
  2. Choose the warning you wish to extend by right-clicking in the area of the desired warning (see for more info). The polygon will appear and that product will come to the top of the list.

  3. Choose the amount of time you wish to add to the warning. Note for combined Flash Flood/Severe warnings, the time is only added to the Flash Flood end time. The time in the VTEC line for the SV.W will stay the same.

  4. DO NOT edit the polygon vertices. The polygon should be the same for the extension as it was in the previous issuance. While this is possible in OB7.2, the vertices are appropriately locked in OB8.1.

  5. Click Create Text
  6. Edit the product as needed and Send.

  7. Note the time to expiration changes in the drop down menu