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Real-time posts made during testbed nowcast and warning operations.
Our forecasters have issued a Tornado warning for the storm in Custer County. This was based on highly deviant motion and increased rotational characteristics with convergent signatures. This based on 88D and PAR data. PAR scanning stragety is sufficient to monitor storm.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Our forecasters have issued a severe thunderstorm warning for storms in Western Oklahoma (Custer county). Reasoning for the warning was storm structure and organization as revealed through the phased array radar. The scan strategy implemented by the PAR (thunderstorm far with adaptive scanning) was found to be superior to the current strategy implement in KTLX; the superiority was found in the selection of PRT which helped minimize dealising problems.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Getting a late start as the cap has held and lack of upper air features to develop storms. However, storms may be forming in west Oklahoma. Our forecasters are looking are PAR data and WSR-88D data from KTLX.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Wrapped up around 8pm, with brief discussion and survey. Major comments were (again) that the MESH tracks were very ueful in helping orient the warning polygons that they issued. The Motley county (lead supercell) had a stronger signature than the one that actually produced a tornado to its west. AzShear values were above .024 for the non-producing storm while the others were about half of that.
Forecaster favorite products this evening were:
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Working on one machine, now. Forecasters alternated dinner breaks, and warning ops continue unbroken. Live video showing a broad rain-free base on the storm of interest in Floyd / Motley counties.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Both machines are having problems with AWIPS, so we are rebooting and possibly takign a dinner break for the time being.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Both forecasters have commented independently that there needs to be a way to overlay the radial velocity from a single radar with the Rotation Tracks product. (This is possible in WDSSII’s wg display, but is a limitation of AWIPS).
MESH values seem to match very well with reports, except for one baseball reports that may have been associated with a left-mover.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Tornado Warning for Motley County based on increasing azimuthal shear trend and possible boundary interaction.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
Strong convergent anti-cyclonic circulation on a storm (need anti-cyclonic rotation tracks!)
MESH of 1 inch produced 1 inch hail report. Forecasters are using Rotation Tracks (ML and LL), MESH tracks, and Height of 50 dBZ above -20C fields extensively along side single-radar data.
Greg Stumpf (EWP Weekly Coordinator, 27 Apr – 1 May 2009)
