Alert archive / Illinois / Tornado Warnings in 2011
Tornado Warning 16, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Jul 27, 2011, 9:16 PM CDT for Jackson County, Iowa; Carroll County, Jo Daviess County, Illinois. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2011, 9:16 PM CDT (02:16 UTC)
- Expired
- Jul 27, 2011, 9:47 PM CDT
- In force
- 31 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
Counties Jackson County, IA, Carroll County, IL, Jo Daviess County, IL
The radar
The Quad Cities radar (KDVN), 72 km from the middle of the area, began a volume at 02:19 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.
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 27, 7:43 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.3 hours before the alert went out and 68 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
- 4556 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 962 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 316 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 19.4
The text
As transmitted, in the capitals the NWS used until 2016.
396 WFUS53 KDVN 280216 TORDVN IAC097-ILC015-085-280300- /O.NEW.KDVN.TO.W.0016.110728T0216Z-110728T0300Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 916 PM CDT WED JUL 27 2011 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * TORNADO WARNING FOR... EASTERN JACKSON COUNTY IN EAST CENTRAL IOWA... CARROLL COUNTY IN NORTHWEST ILLINOIS... SOUTHERN JO DAVIESS COUNTY IN NORTHWEST ILLINOIS... * UNTIL 1000 PM CDT. * AT 911 PM CDT...DOPPLER RADAR INDICATED A TORNADO NEAR WHITTON...OR 15 MILES SOUTH OF GALENA...MOVING EAST AT 25 MPH. SPOTTERS HAVE REPORTED A FUNNEL CLOUD IN NORTHEAST JACKSON COUNTY WITH THIS STORM. * THE TORNADO WILL BE NEAR... WHITTON AND HANOVER AROUND 915 PM CDT... GREEN ISLAND AND REECEVILLE AROUND 920 PM CDT... MISSISSIPPI PALISADES AROUND 935 PM CDT... SABULA AROUND 940 PM CDT... SAVANNA AROUND 945 PM CDT... CENTER HILL AND WACKER AROUND 955 PM CDT... THIS WARNING REPLACES THE EARLIER TORNADO WARNING FOR JACKSON COUNTY. 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. && LAT...LON 4216 8980 4194 8991 4215 9049 4231 9041 TIME...MOT...LOC 0214Z 291DEG 21KT 4220 9033 $$ LE
2 follow-up statements
844
WWUS53 KDVN 280241
SVSDVN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
941 PM CDT WED JUL 27 2011
ILC085-280250-
/O.CAN.KDVN.TO.W.0016.000000T0000Z-110728T0300Z/
JO DAVIESS IL-
941 PM CDT WED JUL 27 2011
...THE TORNADO WARNING FOR SOUTH CENTRAL JO DAVIESS COUNTY IS
CANCELLED...
THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A TORNADO HAS MOVED
OUT OF THE WARNED AREA. THEREFORE THE TORNADO WARNING HAS BEEN
CANCELLED.
HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING VERY HEAVY
RAINFALL...AND MAY PRODUCE LOCALIZED FLOODING.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT THURSDAY MORNING
FOR NORTHEASTERN IOWA AND NORTHWEST ILLINOIS.
LAT...LON 4216 8980 4194 8991 4212 9038 4220 9031
4220 8997
TIME...MOT...LOC 0240Z 291DEG 21KT 4214 9014
$$
IAC097-ILC015-280300-
/O.CON.KDVN.TO.W.0016.000000T0000Z-110728T0300Z/
JACKSON IA-CARROLL IL-
941 PM CDT WED JUL 27 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT FOR WESTERN
CARROLL AND SOUTHEASTERN JACKSON COUNTIES...
AT 936 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO. THIS TORNADO WAS LOCATED APPROXIMATELY NEAR
MISSISSIPPI PALISADES...OR 11 MILES WEST OF MOUNT CARROLL...MOVING
EAST AT 25 MPH.
THE TORNADO WILL BE NEAR...
SAVANNA AROUND 945 PM CDT...
CENTER HILL AND WACKER AROUND 955 PM CDT...
MOUNT CARROLL...ARGO FAY...8 MILES NORTHWEST OF CHADWICK AND 8
MILES WEST OF LANARK AROUND 1000 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT THURSDAY MORNING
FOR NORTHEASTERN IOWA AND NORTHWEST ILLINOIS.
&&
LAT...LON 4216 8980 4194 8991 4212 9038 4220 9031
4220 8997
TIME...MOT...LOC 0240Z 291DEG 21KT 4214 9014
$$
LE961
WWUS53 KDVN 280247
SVSDVN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
947 PM CDT WED JUL 27 2011
IAC097-ILC015-280257-
/O.CAN.KDVN.TO.W.0016.000000T0000Z-110728T0300Z/
JACKSON IA-CARROLL IL-
947 PM CDT WED JUL 27 2011
...THE TORNADO WARNING FOR CARROLL AND SOUTHEASTERN JACKSON COUNTIES
IS CANCELLED...
THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING A TORNADO HAS
WEAKENED AND MOVED OUT OF THE WARNED AREA. THEREFORE THE TORNADO
WARNING HAS BEEN CANCELLED.
HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING VERY HEAVY
RAINFALL AND LOCALIZED FLOODING.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT THURSDAY MORNING
FOR NORTHEASTERN IOWA AND NORTHWEST ILLINOIS.
LAT...LON 4216 8980 4194 8991 4212 9038 4220 9031
4220 8997
TIME...MOT...LOC 0247Z 291DEG 21KT 4212 9009
$$
LEThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 7:10 PM CDT | Flash Flood Warning | DVN | Dubuque, Jackson | 9 hr |
| Jul 27, 7:35 PM CDT | Tornado Warning | DVN | Dubuque, Jackson | 40 min |
| Jul 27, 8:29 PM CDT | Tornado Warning | DVN | Dubuque, Jackson | 46 min |
| Jul 27, 11:55 PM CDT | Flash Flood Warning | DVN | Jackson | 4 hr |
| Jul 28, 12:50 AM CDT | Special Weather Statement | DVN | Delaware, Dubuque, Jackson | 55 min |
| Jul 28, 1:13 AM CDT | Flash Flood Warning | DVN | Buchanan, Delaware | 5 hr |
| Jul 28, 4:10 AM CDT | Areal Flood Warning | DVN | Delaware, Dubuque, Jackson, Jones | 12 hr |
| Jul 28, 9:26 AM CDT | Special Weather Statement | DVN | Benton, Buchanan, Delaware, Linn | 64 min |
| Jul 28, 9:40 AM CDT | Special Weather Statement | DVN | Muscatine, Scott | 50 min |
| Jul 28, 10:15 AM CDT | River Flood Warning | DVN | Dubuque, Jackson | 6 hr |
| Jul 28, 10:15 AM CDT | River Flood Warning | DVN | Jackson | 6 hr |
| Jul 28, 12:03 PM CDT | Heat Advisory | DVN | Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more | 10 hr |
| Jul 27, 7:51 PM CDT | Tornado Warning | DVN | Jo Daviess, Stephenson | 39 min |
| Jul 27, 8:40 PM CDT | Flash Flood Warning | DVN | Stephenson | 8 hr |
| Jul 28, 10:15 AM CDT | River Flood Warning | DVN | Stephenson | 43 hr |
| Jul 28, 3:39 PM CDT | Areal Flood Warning | DVN | Carroll, Jo Daviess, Stephenson | 6 hr |
Nearby
Tornado Warnings in Illinois, 2011Tornado 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.