NOAA/CIMSS ProbSevere with a tornadic cell in Kansas/Oklahoma

April 26th, 2016 |
GOES-14 Visible (0.63 µm) Imagery, 26 April 2016. An orphan anvil is indicated by the Green Arrow at the start of the animation (click to play animation)

GOES-14 Visible (0.63 µm) Imagery, 26 April 2016. An orphan anvil is indicated by the Green Arrow at the start of the animation (click to play animation)

April 26 2016 was a day of well-anticipated severe weather (even a week out!) over the central and southern Plains, with a Moderate Risk of Severe Weather predicted for parts of Nebraska, Kansas, Oklahoma and Texas. The GOES-14 visible animation, above, shows the development of strong thunderstorms in north-central Oklahoma that propagated into south central Kansas, producing hail around 2000 UTC. Note the presence of an orphan anvil just downstream of the developing convection (to the south of the Green Arrow) at the beginning of the GOES-14 SRSO-R animation (that unfortunately has a 15-minute data gap starting at 1900 UTC).

How did the NOAA/CIMSS ProbSevere product perform with this severe cell? ProbSevere provides a probabilistic estimate of whether a cell will produce severe weather within the next 60 minutes. The animation below shows the quick development of the radar feature that became the hail producer. The Satellite Growth of this particular storm was not observed to be strong. Moderate satellite growth and weak glaciation was diagnosed. However, ProbSevere values became very large because of the environment in which the cell developed, because of the presence of large MRMS MESH observations, and active lightning. ProbSevere exceeded a 50% threshold at 1912 UTC, 6 minutes before the Severe Thunderstorm Warning was issued.  The Table at the bottom shows the ProbSevere components as a function of time.

According to SPC storm reports, the cell produced a brief rope tornado at 2058 UTC in far southern Kansas. This storm was blogged about at the Hazardous Weather Testbed. Click here and here for blog posts on the environmental instability.

NOAA/CIMSS ProbSevere Output, 1824-1946 UTC on 26 April 2016 (click to play animation)

NOAA/CIMSS ProbSevere Output, 1824-1946 UTC on 26 April 2016 (click to play animation)

A zoomed-in animation of the Visible Imagery shows the orphan anvil developing around 1740 UTC. (A rocking animation is here).

GOES-14 Visible (0.63 µm) Imagery, 26 April 2016. The orphan anvil is indicated by the Cyan Arrows through the animation (click to play animation)

GOES-14 Visible (0.63 µm) Imagery, 26 April 2016. The orphan anvil is indicated by the Cyan Arrows through the animation (click to play animation)

 

Time (UTC) ProbSevere MUCAPE Env. Bulk Shear MRMS MESH (Inches) Satellite Growth Satellite Glaciation # Flashes
1854
1858 20% 4739 41.9 0.29 1.9% (Moderate) 0.02 (Weak) 0
1900 29% 4702 41.8 0.45 1.9% (Moderate) 0.02 (Weak) 0
1908 34% 4640 40.9 0.54 1.9% (Moderate) 0.02 (Weak) 5
1910 47% 4628 40.7 0.65 1.9% (Moderate) 0.02 (Weak) 13
1912 59% 4623 40.4 0.65 1.9% (Moderate) 0.02 (Weak) 24
1914 58% 4619 40.1 0.65 1.9% (Moderate) 0.02 (Weak) 24
1916 58% 4614 39.8 0.65 1.9% (Moderate) 0.02 (Weak) 24
1918 54% 4614 39.8 0.60 1.9% (Moderate) 0.02 (Weak) 24
1920 60% 4592 39.4 0.74 1.9% (Moderate) 0.02 (Weak) 20
1922 65% 4591 39.1 0.80 1.9% (Moderate) 0.02 (Weak) 20
1924 73% 4591 39.1 0.80 1.9% (Moderate) 0.02 (Weak) 25
1926 75% 4572 38.8 0.84 1.9% (Moderate) 0.02 (Weak) 26
1928 88% 4578 38.7 1.01 1.9% (Moderate) 0.02 (Weak) 31
1930 89% 4578 38.7 1.01 1.9% (Moderate) 0.02 (Weak) 36
1932 97% 4580 38.6 1.24 1.9% (Moderate) 0.02 (Weak) 49
1934 97% 4560 38.3 1.24 1.9% (Moderate) 0.02 (Weak) 58
1936 97% 4544 38.1 1.24 1.9% (Moderate) 0.02 (Weak) 58
1938 97% 4543 38.0 1.24 1.9% (Moderate) 0.02 (Weak) 58
1940 97% 4540 37.8 1.26 1.9% (Moderate) 0.02 (Weak) 58
1942 98% 4528 37.7 1.53 1.9% (Moderate) 0.02 (Weak) 56
1944 99% 4516 37.5 1.71 1.9% (Moderate) 0.02 (Weak) 56
1946 99% 4507 37.4 1.71 1.9% (Moderate) 0.02 (Weak) 56