Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Lincoln, IL

April 10, 20114 counties in Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 10, 2011, 10:31 PM CDT for 4 counties in Illinois. It was in force for 44 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: Apr 10, 2011, 10:31 PM CDT (03:31 UTC)
Expired: Apr 10, 2011, 11:15 PM CDT
In force: 44 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Mason County, IL, McLean County, IL, Tazewell County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 46 km from the middle of the area, began a volume at 03:35 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
Apr 10, 10:52 PM CDT	HAIL 0.75	3 Nw Minier, IL

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
Apr 10, 6:05 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.5 hours before the alert went out and 78 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: 1523 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1493 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

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

271 
WUUS53 KILX 110331
SVRILX
ILC113-125-179-203-110415-
/O.NEW.KILX.SV.W.0021.110411T0331Z-110411T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1031 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MCLEAN COUNTY IN CENTRAL ILLINOIS...
  NORTHEASTERN MASON COUNTY IN CENTRAL ILLINOIS...
  TAZEWELL COUNTY IN CENTRAL ILLINOIS...
  SOUTH CENTRAL WOODFORD COUNTY IN CENTRAL ILLINOIS...

* UNTIL 1115 PM CDT.

* AT 1025 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF MANITO...OR
  11 MILES EAST OF HAVANA...AND MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PEKIN...EUREKA...GREEN VALLEY...SOUTH PEKIN...DELAVAN...HOPEDALE...
  TREMONT...MORTON...MACKINAW...DEER CREEK...GOODFIELD...DANVERS...
  CARLOCK...SECOR...HUDSON...EL PASO...POWERTON...DILLON...GROVELAND
  AND CONGERVILLE.

THIS INCLUDES INTERSTATE 39 BETWEEN MILE MARKERS 4 AND 17.

THIS INCLUDES INTERSTATE 74 BETWEEN MILE MARKERS 100 AND 124.

THIS INCLUDES INTERSTATE 155 BETWEEN MILE MARKERS 16 AND 31.

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.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT MONDAY MORNING FOR
NORTHWESTERN ILLINOIS.

LAT...LON 4084 8908 4061 8890 4042 8937 4025 8976
      4042 8991
TIME...MOT...LOC 0331Z 238DEG 54KT 4040 8975
WIND...HAIL 60MPH <.75IN

$$

SMITH

3 follow-up statements

944 
WWUS53 KILX 110345
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1045 PM CDT SUN APR 10 2011

ILC125-110355-
/O.CAN.KILX.SV.W.0021.000000T0000Z-110411T0415Z/
MASON IL-
1045 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MASON COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4057 8962 4084 8908 4061 8890 4042 8937
      4038 8947
TIME...MOT...LOC 0345Z 238DEG 54KT 4051 8951

$$

ILC113-179-203-110415-
/O.CON.KILX.SV.W.0021.000000T0000Z-110411T0415Z/
MCLEAN IL-TAZEWELL IL-WOODFORD IL-
1045 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
WOODFORD...EASTERN TAZEWELL AND NORTHWESTERN MCLEAN COUNTIES UNTIL
1115 PM CDT...

AT 1044 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR TREMONT...OR 7 MILES SOUTHEAST
OF PEKIN...MOVING NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  EUREKA...HOPEDALE...TREMONT...MORTON...MACKINAW...DEER CREEK...
  GOODFIELD...DANVERS...CARLOCK...SECOR...HUDSON...EL PASO...
  GROVELAND...CONGERVILLE...EVERGREEN LAKE AND KAPPA.

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 4057 8962 4084 8908 4061 8890 4042 8937
      4038 8947
TIME...MOT...LOC 0345Z 238DEG 54KT 4051 8951
WIND...HAIL 60MPH <.75IN

$$

SMITH

232 
WWUS53 KILX 110401
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1101 PM CDT SUN APR 10 2011

ILC113-179-203-110415-
/O.CON.KILX.SV.W.0021.000000T0000Z-110411T0415Z/
MCLEAN IL-TAZEWELL IL-WOODFORD IL-
1101 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
WOODFORD...EAST CENTRAL TAZEWELL AND NORTHWESTERN MCLEAN COUNTIES
UNTIL 1115 PM CDT...

AT 1058 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR GOODFIELD...OR 10 MILES SOUTH OF
EUREKA...MOVING NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  CARLOCK...SECOR...HUDSON...EL PASO...EVERGREEN LAKE AND KAPPA.

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 4046 8928 4066 8942 4084 8908 4061 8890
      4042 8937
TIME...MOT...LOC 0402Z 238DEG 54KT 4060 8919
WIND...HAIL 60MPH <.75IN

$$

SMITH

148 
WWUS53 KILX 110415
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1115 PM CDT SUN APR 10 2011

ILC113-179-203-110425-
/O.EXP.KILX.SV.W.0021.000000T0000Z-110411T0415Z/
MCLEAN IL-TAZEWELL IL-WOODFORD IL-
1115 PM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WOODFORD...EAST
CENTRAL TAZEWELL AND NORTHWESTERN MCLEAN COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1 AM.

LAT...LON 4046 8928 4066 8942 4084 8908 4061 8890
      4042 8937
TIME...MOT...LOC 0401Z 238DEG 54KT 4059 8920

$$

SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 8:24 PM CDT	River Flood Warning	ILX	Lawrence	25 hr
Apr 10, 8:58 PM CDT	Special Weather Statement	ILX	Fulton, Schuyler	47 min
Apr 10, 9:50 PM CDT	Special Weather Statement	ILX	Peoria	40 min
Apr 10, 9:55 PM CDT	Special Weather Statement	ILX	Mason	50 min
Apr 10, 10:13 PM CDT	Special Weather Statement	ILX	Tazewell	47 min
Apr 10, 10:28 PM CDT	Special Weather Statement	ILX	McLean	47 min
Apr 10, 10:35 PM CDT	Special Weather Statement	ILX	Cass, Menard, Morgan, Scott	40 min
Apr 10, 10:47 PM CDT	Special Weather Statement	ILX	McLean	28 min
Apr 10, 10:50 PM CDT	Severe Thunderstorm Warning	ILX	McLean	25 min
Apr 10, 11:12 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Scott	34 min
Apr 11, 12:36 AM CDT	Special Weather Statement	ILX	Moultrie	39 min
Apr 11, 12:58 AM CDT	Special Weather Statement	ILX	Champaign, Piatt, Vermilion	62 min
Apr 11, 1:13 AM CDT	Severe Thunderstorm Warning	ILX	Champaign, Piatt, Vermilion	47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Every 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.