Alert archive / Nebraska / Tornado Warnings in 2011
Tornado Warning 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at May 9, 2011, 7:32 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 9, 2011, 7:32 PM MDT (01:32 UTC)
- Expired
- May 9, 2011, 8:15 PM MDT
- In force
- 43 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Dawes County, NE, Sioux County, NE
The radar
The Rapid City radar (KUDX), 141 km from the middle of the area, began a volume at 01:34 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 9, 7:57 PM MDT | HAIL 0.25 | 12 Nw Chadron, NE | COVERS THE GROUND. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 9, 2:26 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 1.5 hours before the alert went out and 134 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
- 231 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 581 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 247 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
129 WFUS55 KCYS 100132 TORCYS NEC045-165-100215- /O.NEW.KCYS.TO.W.0004.110510T0132Z-110510T0215Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 732 PM MDT MON MAY 9 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... NORTHERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA... NORTHEASTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA... * UNTIL 815 PM MDT * AT 710 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 10 MILES EAST OF HARRISON. AS OF 725 PM...DOPPLER RADAR INDICATED THE CONTINUED POSSIBILITY OF A TORNADO JUST TO THE NORTHEAST OF CRAWFORD. THE THUNDERSTORM PRODUCING THE TORNADO WAS MOVING TO THE NORTHEAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... CHADRON AND CHADRON AIRPORT. THIS WARNING REPLACES THE PREVIOUSLY ISSUED TORNADO WARNING. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4299 10278 4269 10318 4271 10359 4301 10342 TIME...MOT...LOC 0130Z 202DEG 27KT 4282 10340 $$ MSW
3 follow-up statements
808 WWUS55 KCYS 100146 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 746 PM MDT MON MAY 9 2011 NEC165-100153- /O.CAN.KCYS.TO.W.0004.000000T0000Z-110510T0215Z/ SIOUX NE- 746 PM MDT MON MAY 9 2011 ...THE TORNADO WARNING FOR NORTHEASTERN SIOUX COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4272 10343 4301 10342 4299 10278 4269 10318 TIME...MOT...LOC 0143Z 202DEG 27KT 4291 10335 $$ NEC045-100215- /O.CON.KCYS.TO.W.0004.000000T0000Z-110510T0215Z/ DAWES NE- 746 PM MDT MON MAY 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN DAWES COUNTY UNTIL 815 PM MDT... AT 741 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD 4 TO 5 MILES EAST OF WHITNEY...JUST NORTH OF HIGHWAY 20. THE SEVERE THUNDERSTORM PRODUCING THE CURRENT FUNNEL CLOUD WAS MOVING TO THE NORTHEAST AT 30 MPH. THE FUNNEL CLOUD MAY TOUCH DOWN AT ANY TIME. LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF NORTHWESTERN DAWES COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN NORTHERN DAWES COUNTY...TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4272 10343 4301 10342 4299 10278 4269 10318 TIME...MOT...LOC 0143Z 202DEG 27KT 4291 10335 $$ MSW
637 WWUS55 KCYS 100157 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 757 PM MDT MON MAY 9 2011 NEC045-100215- /O.CON.KCYS.TO.W.0004.000000T0000Z-110510T0215Z/ DAWES NE- 757 PM MDT MON MAY 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN DAWES COUNTY UNTIL 815 PM MDT... AT 741 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD 5 MILES TO THE EAST OF WHITNEY. THE SEVERE THUNDERSTORM WAS LOCATED ABOUT 15 MILES TO THE NORTHWEST OF CHADRON WITH DOPPLER RADAR STILL INDICATING THE POSSIBILITY OF A TORNADO. THE STORM PRODUCING THE POSSIBLE TORNADO WAS MOVING TO THE NORTHEAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4286 10331 4297 10329 4299 10278 4278 10311 TIME...MOT...LOC 0155Z 202DEG 27KT 4299 10330 $$ MSW
190 WWUS55 KCYS 100218 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 818 PM MDT MON MAY 9 2011 NEC045-100228- /O.EXP.KCYS.TO.W.0004.000000T0000Z-110510T0215Z/ DAWES NE- 818 PM MDT MON MAY 9 2011 ...THE TORNADO WARNING FOR NORTHEASTERN DAWES COUNTY HAS EXPIRED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4286 10331 4297 10329 4299 10278 4278 10311 TIME...MOT...LOC 0157Z 202DEG 27KT 4300 10329 $$ MSW
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 6:03 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 57 min |
| May 9, 6:55 PM MDT | Tornado Warning | CYS | Dawes, Sioux | 35 min |
| May 9, 7:53 PM MDT | Tornado Warning | CYS | Box Butte, Dawes, Sioux | 28 min |
| May 9, 8:17 PM MDT | Tornado Warning | CYS | Box Butte, Dawes | 30 min |
Nearby
Tornado Warnings in Nebraska, 2011Every tornado warning in 2011Tornadoes in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.