Alert archive / Nebraska / Tornado Warnings in 2011
Tornado Warning 20, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jul 2, 2011, 7:23 PM MDT for Banner County, Scotts Bluff County, Sioux County, Nebraska; Goshen County, Wyoming. It was in force for 37 min. 5 reports 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
- Jul 2, 2011, 7:23 PM MDT (01:23 UTC)
- Expired
- Jul 2, 2011, 8:00 PM MDT
- In force
- 37 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Banner County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY
The radar
The Cheyenne radar (KCYS), 115 km from the middle of the area, began a volume at 01:23 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 |
|---|---|---|---|
| Jul 2, 7:30 PM MDT | HAIL 2 | 9 Sse Torrington, WY | FROM COCORAHS OBSERVER |
| Jul 2, 7:37 PM MDT | TORNADO | 2 W Lyman, WY | |
| Jul 2, 7:49 PM MDT | FUNNEL CLOUD | 3 W Lyman, WY | FUNNEL APPROXIMATELY 75 FEET OFF THE GROUND |
| Jul 2, 7:59 PM MDT | HAIL 1.75 | Lyman, NE | |
| Jul 2, 8:00 PM MDT | HAIL 1 | 7 E Lyman, NE | NO ROTATION. |
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 |
|---|---|---|---|
| Jul 2, 2:13 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.4 hours before the alert went out and 229 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
- 920 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 2294 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -51 m²/s²
- 0-3 km storm-relative helicity
- -12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.0
The text
As transmitted, in the capitals the NWS used until 2016.
377 WFUS55 KCYS 030123 TORCYS NEC007-157-165-WYC015-030200- /O.NEW.KCYS.TO.W.0020.110703T0123Z-110703T0200Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 723 PM MDT SAT JUL 2 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL BANNER COUNTY IN THE PANHANDLE OF NEBRASKA... SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA... SOUTHWESTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA... EAST CENTRAL GOSHEN COUNTY IN SOUTHEAST WYOMING... * UNTIL 800 PM MDT * AT 718 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 7 MILES NORTHWEST OF LYMAN...OR 7 MILES SOUTH OF TORRINGTON...AND MOVING SOUTHEAST AT 35 MPH. IN ADDITION...AT HAIL TO THE SIZE OF GOLFBALLS WAS REPORTED WITH THIS STORM. * LOCATIONS IMPACTED INCLUDE... SCOTTSBLUFF...LYMAN...MORRILL...STEGALL...MITCHELL...SCOTTS BLUFF NATIONAL MONUMENT...TERRYTOWN...GERING...SCOTTSBLUFF AIRPORT AND HENRY. 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 4186 10353 4162 10377 4194 10428 4213 10407 TIME...MOT...LOC 0122Z 303DEG 32KT 4194 10412 $$ MAZUR
1 follow-up statement
017 WWUS55 KCYS 030156 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 756 PM MDT SAT JUL 2 2011 NEC007-157-165-WYC015-030205- /O.EXP.KCYS.TO.W.0020.000000T0000Z-110703T0200Z/ BANNER NE-SCOTTS BLUFF NE-GOSHEN WY-SIOUX NE- 756 PM MDT SAT JUL 2 2011 ...THE TORNADO WARNING FOR SOUTHWESTERN SIOUX...EAST CENTRAL GOSHEN...SCOTTS BLUFF AND NORTH CENTRAL BANNER COUNTIES HAS BEEN REISSUED... PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER INFORMATION. HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4186 10353 4162 10377 4194 10428 4213 10407 TIME...MOT...LOC 0155Z 303DEG 32KT 4178 10379 $$ MAZUR
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 6:44 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 61 min |
| Jul 2, 6:56 PM MDT | Tornado Warning | CYS | Sioux | 49 min |
| Jul 2, 7:41 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill, Scotts Bluff, Sioux | 49 min |
| Jul 2, 7:54 PM MDT | Tornado Warning | CYS | Banner, Scotts Bluff | 40 min |
| Jul 2, 8:25 PM MDT | Flash Flood Warning | CYS | Banner, Scotts Bluff | 6 hr |
| Jul 2, 8:30 PM MDT | Tornado Warning | CYS | Banner, Kimball, Scotts Bluff | 45 min |
| Jul 2, 9:11 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 49 min |
| Jul 3, 1:55 AM MDT | Areal Flood Warning | CYS | Banner, Scotts Bluff | 7 hr |
| Jul 2, 6:04 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 41 min |
| Jul 2, 6:22 PM MDT | Tornado Warning | CYS | Goshen | 37 min |
Nearby
Tornado Warnings in Nebraska, 2011Tornado Warnings in Wyoming, 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.