Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 9, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at May 25, 2011, 4:35 PM CDT for Hancock County, Illinois; Des Moines County, Henry County, Lee County, Iowa. It was in force for 40 min. 4 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
- May 25, 2011, 4:35 PM CDT (21:35 UTC)
- Expired
- May 25, 2011, 5:15 PM CDT
- In force
- 40 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
Counties Des Moines County, IA, Henry County, IA, Lee County, IA, Hancock County, IL
The radar
The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 21:38 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 25, 4:52 PM CDT | TORNADO | 5 Wnw Burlington, IA | DEBRIS FLYING IN SKY JUST EAST OF HIGHWAY 34 TRUCKSTOP |
| May 25, 4:58 PM CDT | TSTM WND GST 60 | 5 Nw Burlington, IA | |
| May 25, 4:59 PM CDT | HAIL 0.75 | 5 Nw Burlington, IA | LOCATED AT HIGHWAY 34 TRUCKSTOP |
| May 25, 5:08 PM CDT | TSTM WND DMG | Dodgeville, IA | ENTIRE ROOF BLOWN OFF OF A BARN. |
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 25, 2:31 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 248 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
- 1832 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 561 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 10.1
The text
As transmitted, in the capitals the NWS used until 2016.
491 WFUS53 KDVN 252135 TORDVN IAC057-087-111-ILC067-252215- /O.NEW.KDVN.TO.W.0009.110525T2135Z-110525T2215Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 435 PM CDT WED MAY 25 2011 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * TORNADO WARNING FOR... SOUTHWESTERN DES MOINES COUNTY IN SOUTHEAST IOWA... SOUTHEASTERN HENRY COUNTY IN SOUTHEAST IOWA... EASTERN LEE COUNTY IN SOUTHEAST IOWA... NORTH CENTRAL HANCOCK COUNTY IN WEST CENTRAL ILLINOIS... * UNTIL 515 PM CDT. * AT 433 PM CDT...TRAINED SPOTTERS AND DOPPLER RADAR INDICATED A TORNADO NEAR FORT MADISON...MOVING NORTH AT 40 MPH. AT 430 PM A TRAINED SPOTTER REPORTED A ROTATING FUNNEL CLOUD JUST EAST OF FORT MADISON. * THE TORNADO WILL BE NEAR... FORT MADISON AND NIOTA AROUND 435 PM CDT... SAWYER...FORT MADISON MUNICIPAL ARPT AND FRANKLIN AROUND 440 PM CDT... DENMARK...WEST POINT AND SOUTH AUGUSTA AROUND 445 PM CDT... AUGUSTA AND ST. PAUL AROUND 450 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. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING FOR SOUTHEAST IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI. && LAT...LON 4097 9161 4095 9110 4052 9124 4052 9149 TIME...MOT...LOC 2134Z 179DEG 36KT 4062 9138 $$ 12
3 follow-up statements
709 WWUS53 KDVN 252151 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 451 PM CDT WED MAY 25 2011 IAC057-087-111-ILC067-252215- /O.CON.KDVN.TO.W.0009.000000T0000Z-110525T2215Z/ LEE IA-HENRY IA-DES MOINES IA-HANCOCK IL- 451 PM CDT WED MAY 25 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR NORTH CENTRAL HANCOCK...SOUTHWESTERN DES MOINES...SOUTHEASTERN HENRY AND EASTERN LEE COUNTIES... AT 447 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED APPROXIMATELY NEAR AUGUSTA...OR 7 MILES SOUTHWEST OF BURLINGTON...MOVING NORTH AT 40 MPH. THE TORNADO WILL BE NEAR... PRAIRIE GROVE AROUND 500 PM CDT... DODGEVILLE AND 9 MILES EAST OF NEW LONDON AROUND 505 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING FOR SOUTHEAST IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI. && LAT...LON 4097 9161 4095 9110 4052 9124 4052 9149 TIME...MOT...LOC 2151Z 179DEG 36KT 4080 9123 $$ 12
076
WWUS53 KDVN 252200
SVSDVN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 PM CDT WED MAY 25 2011
IAC111-ILC067-252209-
/O.CAN.KDVN.TO.W.0009.000000T0000Z-110525T2215Z/
LEE IA-HANCOCK IL-
500 PM CDT WED MAY 25 2011
...THE TORNADO WARNING FOR NORTH CENTRAL HANCOCK AND EASTERN LEE
COUNTIES IS CANCELLED...
THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A SEVERE
WEATHER HAS WEAKENED. THEREFORE THE TORNADO WARNING HAS BEEN
CANCELLED.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI.
LAT...LON 4076 9129 4077 9130 4077 9131 4080 9135
4079 9137 4081 9140 4096 9140 4095 9110
4080 9115 4074 9117
TIME...MOT...LOC 2159Z 199DEG 35KT 4086 9119
$$
IAC057-087-252215-
/O.CON.KDVN.TO.W.0009.000000T0000Z-110525T2215Z/
HENRY IA-DES MOINES IA-
500 PM CDT WED MAY 25 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
SOUTHWESTERN DES MOINES AND SOUTHEASTERN HENRY COUNTIES...
AT 456 PM CDT...A TORNADO WAS REPORTED. THIS TORNADO WAS LOCATED
APPROXIMATELY NEAR BEAVERDALE...OR NEAR BURLINGTON...MOVING NORTH AT
40 MPH. LAW ENFORCEMENT REPORTED DEBRIS FLYING IN THE AIR. THIS IS A
DANGEROUS SITUATION.
THE TORNADO WILL BE NEAR...
DODGEVILLE AROUND 505 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI.
&&
LAT...LON 4076 9129 4077 9130 4077 9131 4080 9135
4079 9137 4081 9140 4096 9140 4095 9110
4080 9115 4074 9117
TIME...MOT...LOC 2159Z 199DEG 35KT 4086 9119
$$729
WWUS53 KDVN 252214
SVSDVN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
514 PM CDT WED MAY 25 2011
IAC057-087-252224-
/O.EXP.KDVN.TO.W.0009.000000T0000Z-110525T2215Z/
HENRY IA-DES MOINES IA-
514 PM CDT WED MAY 25 2011
...THE TORNADO WARNING FOR SOUTHWESTERN DES MOINES AND SOUTHEASTERN
HENRY COUNTIES WILL EXPIRE AT 515 PM CDT...
THE SEVERE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A TORNADO HAS
MOVED OUT OF THE WARNED AREA. THEREFORE THE TORNADO WARNING HAS BEEN
ALLOWED TO EXPIRE.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI.
LAT...LON 4076 9129 4077 9130 4077 9131 4080 9135
4079 9137 4081 9140 4096 9140 4095 9110
4080 9115 4074 9117
TIME...MOT...LOC 2214Z 199DEG 35KT 4100 9113
$$
12The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 2:20 AM CDT | Special Weather Statement | DVN | Hancock, McDonough | 70 min |
| May 25, 2:38 AM CDT | Flash Flood Watch | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 2 more | 20 hr |
| May 25, 3:46 AM CDT | Special Weather Statement | DVN | Henderson, Mercer, Warren | 59 min |
| May 25, 5:34 AM CDT | Special Weather Statement | DVN | Bureau, Putnam | 56 min |
| May 25, 7:08 AM CDT | Special Weather Statement | DVN | Bureau, Putnam | 52 min |
| May 25, 9:27 AM CDT | River Flood Warning | DVN | Hancock, McDonough | 5 days |
| May 25, 11:46 AM CDT | River Flood Warning | DVN | Henderson | 13 days |
| May 25, 11:46 AM CDT | River Flood Warning | DVN | Hancock, Henderson | 14 days |
| May 25, 11:46 AM CDT | River Flood Warning | DVN | Hancock | 13 days |
| May 25, 2:31 PM CDT | Wind Advisory | DVN | Jo Daviess, Rock Island | 7 hr |
| May 25, 5:05 PM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer | 40 min |
| May 25, 5:11 PM CDT | Tornado Warning | DVN | Mercer | 23 min |
| May 25, 5:30 PM CDT | Severe Thunderstorm Warning | DVN | Henderson, Henry, Mercer, Warren | 45 min |
| May 25, 5:34 PM CDT | Flash Flood Warning | DVN | Henderson, Mercer, Warren | 4 hr |
| May 25, 6:31 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 44 min |
| May 25, 6:37 AM CDT | River Flood Warning | DVN | Iowa, Johnson | 7 days |
| May 25, 6:37 AM CDT | River Flood Warning | DVN | Lee | 52 hr |
| May 25, 9:27 AM CDT | River Flood Warning | DVN | Clinton, Scott | 12 hr |
| May 25, 9:27 AM CDT | River Flood Warning | DVN | Keokuk | 12 hr |
| May 25, 9:27 AM CDT | River Flood Warning | DVN | Des Moines, Henry, Lee | 6 days |
| May 25, 11:46 AM CDT | River Flood Warning | DVN | Johnson, Washington | 34 hr |
| May 25, 3:41 PM CDT | River Flood Warning | DVN | Lee, Van Buren | 20 hr |
| May 25, 4:08 PM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 52 min |
| May 25, 4:55 PM CDT | Flash Flood Warning | DVN | Des Moines, Henry, Jefferson, Lee, Van Buren | 5 hr |
Nearby
Tornado Warnings in Iowa, 2011Tornado Warnings in Illinois, 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.