Alert archive / Nebraska / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 114
The Storm Prediction Center issued this severe thunderstorm watch at Apr 27, 2021, 6:36 PM CDT for 7 counties in Kansas; 8 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2021, 6:36 PM CDT (23:36 UTC)
- Expired
- Apr 28, 2021, 12:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Cheyenne County, KS, Decatur County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Chase County, NE, Dundy County, NE, Frontier County, NE, Hayes County, NE, Hitchcock County, NE, Lincoln County, NE, Perkins County, NE, Red Willow County, NE
The radar
The Goodland radar (KGLD), 94 km from the middle of the area, began a volume at 23:36 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 7:23 PM CDT | Severe Thunderstorm Warning | GLD | Cheyenne, Sherman | 67 min |
| Apr 27, 7:55 PM CDT | Severe Thunderstorm Warning | GLD | Cheyenne | 50 min |
| Apr 27, 8:21 PM CDT | Severe Thunderstorm Warning | GLD | Cheyenne, Rawlins, Sherman | 39 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.6 hours before the alert went out and 123 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -72 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
590 WWUS20 KWNS 272333 SEL4 SPC WW 272333 KSZ000-NEZ000-280500- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 114 NWS Storm Prediction Center Norman OK 535 PM MDT Tue Apr 27 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northwest Kansas Southwest Nebraska * Effective this Tuesday afternoon and evening from 535 PM until 1100 PM MDT. * Primary threats include... Scattered large hail events to 1.5 inches in diameter possible Isolated damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Ongoing severe thunderstorms are likely to continue develop east-northeastward into northwest Kansas and southwest Nebraska this evening, with the strongest storms expected generally be Interstates 70 (Kansas) and 80 (Nebraska). Severe hail and severe-caliber winds will both be possible, and a brief tornado is also possibly mainly early this evening. The severe thunderstorm watch area is approximately along and 75 statute miles north and south of a line from 35 miles north northwest of Goodland KS to 20 miles east southeast of Mccook NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 112...WW 113... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 23025. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 5:24 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Graham, Norton, Rawlins, Sheridan and 2 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2021Severe Thunderstorm Watches in Kansas, 2021Every severe thunderstorm watch in 2021
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.