Alert archive / Wyoming / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 101, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 2, 2011, 4:29 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 46 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
- Jul 2, 2011, 4:29 PM MDT (22:29 UTC)
- Expired
- Jul 2, 2011, 5:15 PM MDT
- In force
- 46 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Converse County, WY, Niobrara County, WY
The radar
The Rapid City radar (KUDX), 190 km from the middle of the area, began a volume at 22:29 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, 5:10 PM MDT | HAIL 1.25 | 1 E Dull Center, WY |
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
Rapid City, SD (KUNR), launched 12:00Z, 10.5 hours before the alert went out and 183 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
- 829 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
181 WUUS55 KCYS 022229 SVRCYS WYC009-027-022315- /O.NEW.KCYS.SV.W.0101.110702T2229Z-110702T2315Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 429 PM MDT SAT JUL 2 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN CONVERSE COUNTY IN EAST CENTRAL WYOMING... NORTHWESTERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING... * UNTIL 515 PM MDT * AT 425 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR DULL CENTER...OR 46 MILES NORTHEAST OF DOUGLAS...AND MOVING NORTH AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... DULL RESERVOIR AND DULL CENTER. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS. && LAT...LON 4326 10486 4328 10511 4351 10513 4350 10474 TIME...MOT...LOC 2229Z 182DEG 24KT 4338 10498 WIND...HAIL 60MPH 1.00IN $$ RE
2 follow-up statements
162 WWUS55 KCYS 022248 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 448 PM MDT SAT JUL 2 2011 WYC009-027-022315- /O.CON.KCYS.SV.W.0101.000000T0000Z-110702T2315Z/ NIOBRARA WY-CONVERSE WY- 448 PM MDT SAT JUL 2 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME NORTHEASTERN CONVERSE AND EXTREME NORTHWESTERN NIOBRARA COUNTIES UNTIL 515 PM MDT... AT 444 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR DULL RESERVOIR...OR 51 MILES NORTHWEST OF LUSK...MOVING NORTHEAST AT 15 MPH. LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF EXTEREM NORTHWESTERN NIOBRARA COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. && LAT...LON 4329 10486 4332 10505 4350 10506 4350 10474 TIME...MOT...LOC 2247Z 212DEG 15KT 4344 10487 WIND...HAIL 60MPH 1.00IN $$ RE
328 WWUS55 KCYS 022311 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 511 PM MDT SAT JUL 2 2011 WYC009-027-022320- /O.EXP.KCYS.SV.W.0101.000000T0000Z-110702T2315Z/ NIOBRARA WY-CONVERSE WY- 511 PM MDT SAT JUL 2 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHEASTERN CONVERSE AND EXTREME NORTHWESTERN NIOBRARA COUNTIES WILL EXPIRE AT 515 PM MDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM MDT! LAT...LON 4329 10486 4332 10505 4350 10506 4350 10474 TIME...MOT...LOC 2310Z 212DEG 15KT 4352 10480 $$ RE
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 3:15 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 25 min |
| Jul 2, 3:50 PM MDT | Tornado Warning | CYS | Converse, Niobrara | 40 min |
| Jul 2, 4:22 PM MDT | Tornado Warning | CYS | Converse, Platte | 38 min |
| Jul 2, 4:42 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 48 min |
| Jul 2, 5:01 PM MDT | Tornado Warning | CYS | Platte | 31 min |
| Jul 2, 5:30 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 45 min |
| Jul 2, 5:40 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 37 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2011Every severe thunderstorm warning 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.