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Real-time posts made during testbed nowcast and warning operations.
Click for animation. CI was 75% on another cloud, which began to show signs of getting sheared off not too long into vertical growth. The 1 min imagery showed that it was still trying to have growth going below that level, but it never managed to get its act together.
Jason Williams & CoonieCatEye
First two images are from 2135z showing a little cellular blob (middle of the image) trying to go up. CI was fairly low at 38%, and given how things have gone thus far, we figured the chances of it going up were pretty small. The third image is from 2154z, showing that indeed that cloud had pretty much completely dissipated.
Jason Williams & CoonieCatEye
It hasn’t amounted to anything yet, but we’re watching a cloud that’s gone up in the far southern end of our CWA. The two images are from 2045z and 2100z. CI hasn’t flagged it at this time, but having the 1-min imagery really helped us see how it was growing – I picked these two images because they were 15 minutes apart and indicate how much that spot has grown in that time.
Jason Williams & CoonieCatEye
We don’t have many obs in our CWA, but we do see that temps are around 90F just outside our CWA. Looking at LAP CAPE, we do see a CAPE gradient not just to our SE but also within our SE CWA. This does make one wonder if warmer temps have indeed made it into our CWA that we aren’t able to see with the lack of obs, but can infer from the higher CAPE values.
Jason Williams
Might have had a DRC from 2346z to 2354z on our middle cell. PGLM values of around 30-40 were present in the storm’s core at 2345z, jumping to 57 two minutes later, 70 at 2350z, and 99 a minute later. Possible hook echo showed up at 2359z and persisted through this post at 0007z.
Jason Williams
The storm south of DIA has a very obvious core, but of note is how far away lightning is being observed from the parent updraft. NLDN shows a CG in the upper-right part of the lightning field, which is a very long distance from the main storm. In fact, there isn’t even any rain falling at that distance.
Jason Williams
2317z radar2316z PGLM
2319z PGLM
2333z radar
Time series of the northern cell. PGLM had a sharp increase in total lightning over three minutes, strongly boosting confidence to reissue SVR.
Jason Williams
Cell south of Denver had an increase in total lightning (20 to 44). Still waiting for an LSR to see if that intensification resulted in hail reports (there have been a handful from storms thus far). That southern storm had not looked particularly great for a little while but the increase in lightning caught our eye.
Jason Williams
Had a cell split SW of Denver (the larger mass of total lightning; SE of Denver is a separate cell entirely); the northern one had initially had more total lightning, but the southern storm ended up becoming the stronger one. The total lightning dropped in the northern cell while it quickly increased in the southern one. About five minutes later, reflectivity really began to show the intensity increase. Storm chaser video also showed a possible funnel cloud.
West side of northern storm had new growth that occurred coincident with an increase in the total lightning on the PGLM.
If an area had an absence of 1 min vis imagery, the total lightning data still gives an alert that growth is (re)occurring.
Jason Williams
