The NUCAPS sounding data became available around 19Z.  We chose a point along the Nebraska/Kansas state line in a cloud free region.  Overall, the sounding appeared valid.  However, the surface dewpoint and temperatures were around ten degrees too low (in comparison to nearby METAR), producing too little CAPE.  After modifying the surface data, CAPE increased to around 2000 J/kg.  This was much higher than the 800-1200 J/kg values being observed from the GOES LAP data.  Considering the severity of resulting convection, the 2000 J/kg values were likely most representative of the environment.  The first image capture is the original, the second is the modified.

BRICK TAMLIN/ALEXANDERS DARK BAND…Brick, is that TRIDENT?

I was focused on warnings for two areas of the cwa and completely missed out on this severe thunderstorm. Looking back, using ProbSevere and Lightning Jump data could be useful in maintaining situational awareness while in warning ops.

This first image taken at 2308Z, shows both the lightning jump and ProbSevere not indicating anything significant with this storm.

But jumping ahead to 5 minutes to 2313Z, there was a 2 sigma lightning jump as the ProbSevere rises to around 50%.

Then, at 2323Z the ProbSevere was up to 77% and there was a 1 sigma lightning jump.

The storm likely went severe shortly after that and a warning was issued later. Having a screen dedicated to those products could be useful in maintaining awareness where there were numerous warnings out. -SRF

Multicell structure became more linear late this afternoon and although ProbSevere is more successful with individual cells, it still highlighted probabilities over 80% for many scans. Some cells possessed tornadic signatures in velocity/SRM while others contained large hail cores aloft. The higher probabilities definitely coincided with both hail/tornadoes in this line.

Brick Tamland/Veronica Corningstone aka Alexander Darkband

Issued a severe thunderstorm warning for Ellsworth county storm based on base data showing a 60 dBz core to 29.5kft and 50 dBz core to 37kft which resulted in a VIL the next volume scan of 60-65 kg/m2.  The ENI flash rate was minimal showing only 12 flashes at the time I started to write the warning and the ProbSevere was showing on 12%. 

About 7 minutes later the ProbSevere jumped up to 81% but was not helpful in issuing the warning.

Jack Bauer

A lightning jump of 1 and 4 sigma was seen on the intensifying storms. The combination of that lightning jump, with high ProbSevere and radar signature warranted the issued warning. -SRF

With ProbSevere continuing to show 89% and recent reports of hen to tennis ball sized hail with the storm, have reissued for that storm as it nears the edge of the CWA.

-SRF

Prob of SVR showed 3+ inch hail probability (MESH) since 2230z. Warning issued with core of storm just south of the CWA and massive hail spike.

P.S. Tornado warning in effect for this county. Just north of the building.

Lynford

With increasing low level rotation near Hillsdale, issued TOR for that cell at 2243Z. ProbSevere continues to show 99% severe prob. -SRF

Reissued tornado warning for the developing tornado to the south.

-SRF