Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 8, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at May 24, 2011, 5:53 PM CDT for Buchanan County, Delaware County, Linn County, Iowa. It was in force for 37 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 24, 2011, 5:53 PM CDT (22:53 UTC)
- Expired
- May 24, 2011, 6:30 PM CDT
- In force
- 37 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
Counties Buchanan County, IA, Delaware County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 117 km from the middle of the area, began a volume at 22:54 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 24, 5:55 PM CDT | FUNNEL CLOUD | 1 Nw Coggon, IA | DEVELOPING ATTM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.9 hours before the alert went out and 121 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
- 206 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 1287 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
388 WFUS53 KDVN 242253 TORDVN IAC019-055-113-242330- /O.NEW.KDVN.TO.W.0008.110524T2253Z-110524T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 553 PM CDT TUE MAY 24 2011 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL LINN COUNTY IN EAST CENTRAL IOWA... SOUTHEASTERN BUCHANAN COUNTY IN NORTHEAST IOWA... WESTERN DELAWARE COUNTY IN NORTHEAST IOWA... * UNTIL 630 PM CDT. * AT 550 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO NEAR ROBINSON...OR 12 MILES SOUTH OF MANCHESTER...MOVING NORTHEAST AT 10 MPH. * THE TORNADO WILL BE NEAR... RYAN AROUND 610 PM CDT... BAILEYS FORD PARK...TURTLE CREEK PARK...DELHI AND MANCHESTER AROUND 630 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING. PLEASE REPORT ANY SEVERE WEATHER OR DAMAGE TO YOUR LOCAL LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE. && LAT...LON 4258 9142 4240 9129 4225 9157 4232 9169 TIME...MOT...LOC 2254Z 227DEG 9KT 4233 9153 $$ HAASE
2 follow-up statements
159 WWUS53 KDVN 242312 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 612 PM CDT TUE MAY 24 2011 IAC019-055-113-242330- /O.CON.KDVN.TO.W.0008.000000T0000Z-110524T2330Z/ LINN IA-DELAWARE IA-BUCHANAN IA- 612 PM CDT TUE MAY 24 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR SOUTHEASTERN BUCHANAN...WESTERN DELAWARE AND NORTH CENTRAL LINN COUNTIES... AT 606 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED APPROXIMATELY NEAR RYAN...OR 10 MILES SOUTH OF MANCHESTER...MOVING NORTHEAST AT 10 MPH. TRAINED SPOTTERS REPORTED A ROTATING WALL CLOUD WITH THIS STORM. THE TORNADO WILL BE NEAR... BAILEYS FORD PARK...TURTLE CREEK PARK...DELHI AND MANCHESTER AROUND 630 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING. PLEASE REPORT ANY SEVERE WEATHER OR DAMAGE TO YOUR LOCAL LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE. && LAT...LON 4258 9142 4240 9129 4225 9157 4232 9169 TIME...MOT...LOC 2311Z 227DEG 9KT 4236 9149 $$ HAASE
397 WWUS53 KDVN 242322 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 622 PM CDT TUE MAY 24 2011 IAC019-055-113-242332- /O.EXP.KDVN.TO.W.0008.000000T0000Z-110524T2330Z/ LINN IA-DELAWARE IA-BUCHANAN IA- 622 PM CDT TUE MAY 24 2011 ...THE TORNADO WARNING FOR SOUTHEASTERN BUCHANAN...WESTERN DELAWARE AND NORTH CENTRAL LINN COUNTIES WILL EXPIRE AT 630 PM CDT... THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A TORNADO HAS WEAKENED. THEREFORE THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE. LAT...LON 4258 9142 4240 9129 4225 9157 4232 9169 TIME...MOT...LOC 2322Z 227DEG 9KT 4238 9146 $$ HAASE
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 4:02 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 58 min |
| May 24, 4:13 PM CDT | Special Weather Statement | DVN | Benton, Iowa | 62 min |
| May 24, 4:44 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa | 61 min |
| May 24, 5:08 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Linn | 52 min |
| May 24, 5:28 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Louisa, Muscatine, Scott | 47 min |
| May 24, 5:33 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 57 min |
| May 24, 5:42 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Linn | 48 min |
Nearby
Tornado Warnings in Iowa, 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.