Alert archive / Nebraska / Mesoscale Discussions in 2013
Mesoscale Discussion 682
The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 6:42 PM CDT for Jewell County, Republic County, Kansas; 18 counties in Nebraska. It was in force for 33 min.
The area
The outline as issued.
The facts
- Issued
- May 18, 2013, 6:42 PM CDT (23:42 UTC)
- Expired
- May 18, 2013, 7:15 PM CDT
- In force
- 33 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
Counties Jewell County, KS, Republic County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Custer County, NE, Franklin County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Merrick County, NE, Nuckolls County, NE, Phelps County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE
The radar
The Grand Island radar (KUEX), 36 km from the middle of the area, began a volume at 23:42 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.7 hours before the alert went out and 177 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.
- Mixed-layer CAPE
- 1531 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 568 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 2:09 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Rawlins, Sheridan, Sherman, Thomas | 96 min |
| May 18, 2:19 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Comanche, Edwards, Finney and 18 more | 56 min |
| May 18, 2:42 PM CDT | Tornado Watch | SPC | Barber, Barton, Butler, Chase, Cheyenne, Clark and 48 more | 8 hr |
| May 18, 5:15 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Edwards, Ford, Gove, Graham, Hodgeman and 9 more | 60 min |
| May 17, 10:26 PM CDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Boyd, Brown, Cherry, Dawes and 9 more | 64 min |
Nearby
Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Kansas, 2013Every mesoscale discussion in 2013
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.