Alert archive / Illinois / Tornado Warnings in 2011

Tornado Warning 9, NWS Lincoln, IL

April 15, 2011Mason County, Menard County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 15, 2011, 5:52 PM CDT for Mason County, Menard County, Illinois. It was in force for 17 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: Apr 15, 2011, 5:52 PM CDT (22:52 UTC)
Expired: Apr 15, 2011, 6:09 PM CDT
In force: 17 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon

Counties Mason County, IL, Menard County, IL

The radar

The Lincoln radar (KILX), 40 km from the middle of the area, began a volume at 22:53 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
Apr 15, 12:47 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 103 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1776 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

892 
WFUS53 KILX 152252
TORILX
ILC125-129-152345-
/O.NEW.KILX.TO.W.0009.110415T2252Z-110415T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
552 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL MASON COUNTY IN CENTRAL ILLINOIS...
  EASTERN MENARD COUNTY IN CENTRAL ILLINOIS...

* UNTIL 645 PM CDT.

* AT 548 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR ATHENS...OR 14 MILES NORTH OF SPRINGFIELD...
  AND MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MASON CITY...GREENVIEW...EASTON...SAN JOSE...SWEETWATER AND POPLAR
  CITY.

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 4028 9003 4032 8960 3998 8964 3996 8976
TIME...MOT...LOC 2253Z 167DEG 27KT 4001 8971

$$

BARNES

1 follow-up statement

760 
WWUS53 KILX 152309
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
609 PM CDT FRI APR 15 2011

ILC125-129-152318-
/O.CAN.KILX.TO.W.0009.000000T0000Z-110415T2345Z/
MASON IL-MENARD IL-
609 PM CDT FRI APR 15 2011

...THE TORNADO WARNING FOR EASTERN MENARD AND CENTRAL MASON COUNTIES
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE.

LAT...LON 4028 9003 4032 8960 3998 8964 3996 8976
TIME...MOT...LOC 2308Z 167DEG 27KT 4012 8974

$$

BARNES

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 9:36 AM CDT	Wind Advisory	ILX	Champaign, DeWitt, Fulton, Knox, Logan, McLean and 8 more	4 hr
Apr 15, 4:27 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Mason, Menard	48 min
Apr 15, 4:51 PM CDT	Special Weather Statement	ILX	Morgan	39 min
Apr 15, 4:59 PM CDT	Tornado Warning	ILX	Sangamon	46 min
Apr 15, 5:06 PM CDT	Tornado Warning	ILX	Mason, Menard	39 min
Apr 15, 5:17 PM CDT	Tornado Warning	ILX	Sangamon	43 min
Apr 15, 5:28 PM CDT	Tornado Warning	ILX	Morgan, Sangamon	47 min
Apr 15, 5:40 PM CDT	Tornado Warning	ILX	Fulton, Mason, Tazewell	50 min
Apr 15, 5:42 PM CDT	Tornado Warning	ILX	Logan, Menard, Sangamon	48 min
Apr 15, 6:00 PM CDT	Tornado Warning	ILX	Sangamon	45 min
Apr 15, 6:23 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Peoria, Tazewell	52 min
Apr 15, 6:27 PM CDT	Tornado Warning	ILX	Logan, Mason, Menard, Sangamon	48 min
Apr 15, 6:28 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Moultrie, Shelby	62 min
Apr 15, 6:38 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Menard, Sangamon	37 min
Apr 15, 6:50 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Cumberland, Effingham, Moultrie, Shelby	55 min

Nearby

Tornado Warnings in Illinois, 2011 Every tornado warning in 2011 Tornadoes 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.