A key component and unique attribute of the ANC system is its ability to produce storm initiation nowcasts based on automated radar detections of surface convergence boundaries and characterization of the boundaries (e.g., estimation of shear profiles along the boundary). Running the ANC on a larger domain resulted in a deficiency in the ability to detect all boundaries on all scales, ranging from the local to the synoptic scale. For example, a cold front evident on synoptic maps was not always well-resolved as a distinct feature on one or more radars.
A new capability has been added to the ANC that allows a forecaster to insert, in real-time, the locations of convergence features that are not detected or are only partially detected on radar(s). These locations are immediately included in all of the boundary-related algorithms running in the ANC. In addition to radar mosaics, information available to the forecaster when delineating important, missed boundary features include numerical model output, frontal likelihood fields, satellite imagery and surface mesonet data. With the use of this new interactive tool it will now be possible to address the importance of different scale interactions on convection initiation and incorporate these scales in the nowcasts of storm initiation. This paper will provide details on the interactive tool plus show examples of the change in storm initiation nowcasts that result when larger scale boundary triggers are included in the nowcast process.