Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 690

May 23, 201626 counties in Nebraska; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 23, 2016, 1:13 AM CDT for 26 counties in Nebraska; 14 counties in South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 23, 2016, 1:13 AM CDT (06:13 UTC)
Expired: May 23, 2016, 2:45 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 40 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Cedar County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Phelps County, NE, Pierce County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 188 km from the middle of the area, began a volume at 06:13 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.2 hours before the alert went out and 204 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 658 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1593 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

754 
ACUS11 KWNS 230614
SWOMCD
SPC MCD 230613 
IAZ000-MNZ000-SDZ000-NEZ000-230745-

MESOSCALE DISCUSSION 0690
NWS STORM PREDICTION CENTER NORMAN OK
0113 AM CDT MON MAY 23 2016

AREAS AFFECTED...ECNTRL NEB AND SE SD

CONCERNING...SEVERE THUNDERSTORM WATCH 195...197...

VALID 230613Z - 230745Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
195...197...CONTINUES.

SUMMARY...AN ISOLATED SEVERE THREAT WILL BE POSSIBLE ACROSS THE ERN
PART OF WW 197 AND WW 195 OVER THE NEXT HOUR OR SO. WIND DAMAGE AND
HAIL WILL BE THE PRIMARY THREATS. THE POTENTIAL FOR SEVERE SHOULD
BECOME MORE MARGINAL TOWARD 08Z AND ADDITIONAL WW ISSUANCE IS NOT
EXPECTED.

DISCUSSION...LATEST RADAR TRENDS SHOW A SOLID LINE OF STRONG
THUNDERSTORMS LOCATED FROM WEST OF SIOUX FALLS SSWWD TO JUST
NORTHEAST OF MCCOOK NEB. THIS LINE IS LOCATED JUST TO THE WEST OF AN
AXIS OF MODERATE INSTABILITY WHERE MLCAPE IS ESTIMATED IN THE 1000
TO 1800 J/KG RANGE. THE LINE IS BEING SUPPORTED BY LIFT ON THE WRN
EDGE OF A 50 TO 65 KT LOW-LEVEL JET. THE INSTABILITY AND STRONG
LOW-LEVEL FLOW SHOULD SUPPORT THUNDERSTORM DEVELOPMENT WITHIN THE
LINE FOR A SEVERAL MORE HOURS. HOWEVER...THE LINE SHOULD GRADUALLY
BECOME ELEVATED AS THE BOUNDARY LAYER CONTINUES TO DECOUPLE. FOR
THIS REASON...THE POTENTIAL FOR WIND DAMAGE SHOULD BECOME MARGINAL.
HAIL WILL STILL BE POSSIBLE WITH THE STRONGER CORES BUT SHOULD ALSO
BECOME MARGINAL AS INSTABILITY DECREASES.

..BROYLES/THOMPSON.. 05/23/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FSD...OAX...GID...LBF...GLD...

LAT...LON   44029788 43359875 42259961 41220024 40050024 40009919
            40359859 42019770 43429640 43969658 44149732 44029788

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 7:33 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Boyd, Cedar, Garfield, Greeley and 8 more	87 min
May 22, 8:22 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Boyd, Garfield, Holt, Knox, Loup and 2 more	7 hr
May 22, 9:26 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Cherry, Custer, Dawson and 11 more	94 min
May 22, 9:59 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Chase, Cherry, Custer and 11 more	5 hr
May 22, 10:19 PM CDT	Mesoscale Discussion	SPC	Dundy, Furnas, Hitchcock, Red Willow	86 min
May 23, 1:58 PM CDT	Mesoscale Discussion	SPC	Burt, Cass, Cedar, Colfax, Cuming, Dakota and 9 more	92 min
May 23, 2:30 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Butler, Clay, Colfax, Fillmore and 18 more	2 hr
May 22, 9:06 PM CDT	Mesoscale Discussion	SPC	Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 7 more	114 min

Nearby

Mesoscale Discussions in Nebraska, 2016 Mesoscale Discussions in South Dakota, 2016 Every mesoscale discussion in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.