Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 3, NWS Lincoln, IL

February 27, 2011McLean County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Feb 27, 2011, 12:21 PM CST for McLean County, Illinois. It was in force for 21 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
Feb 27, 2011, 12:21 PM CST (18:21 UTC)
Expired
Feb 27, 2011, 12:42 PM CST
In force
21 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County McLean County, IL

The radar

The Lincoln radar (KILX), 45 km from the middle of the area, began a volume at 18:24 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.4 hours before the alert went out and 42 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2011-02-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2011-02-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
790 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
193 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.

818 
WUUS53 KILX 271821
SVRILX
ILC113-271900-
/O.NEW.KILX.SV.W.0003.110227T1821Z-110227T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1221 PM CST SUN FEB 27 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCLEAN COUNTY IN CENTRAL ILLINOIS...

* UNTIL 100 PM CST.

* AT 1218 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  MCLEAN...OR 14 MILES NORTHEAST OF LINCOLN...AND MOVING NORTHEAST AT
  65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLOOMINGTON...HEYWORTH...NORMAL...DOWNS...TOWANDA...COOKSVILLE...
  SAYBROOK...COLFAX...SHIRLEY...BLOOMINGTON AIRPORT...HOLDER...
  MORAINE VIEW STATE PARK...ELLSWORTH...ARROWSMITH AND PLEASANT HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4071 8866 4042 8850 4028 8902 4029 8903
      4029 8917 4029 8927 4037 8927
TIME...MOT...LOC 1821Z 242DEG 57KT 4033 8915
WIND...HAIL 60MPH 1.00IN

$$

HJS
1 follow-up statement
370 
WWUS53 KILX 271842
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1242 PM CST SUN FEB 27 2011

ILC113-271852-
/O.CAN.KILX.SV.W.0003.000000T0000Z-110227T1900Z/
MCLEAN IL-
1242 PM CST SUN FEB 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR MCLEAN COUNTY IS CANCELLED...

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

LAT...LON 4071 8866 4042 8850 4028 8902 4029 8903
      4029 8917 4029 8927 4037 8927
TIME...MOT...LOC 1842Z 242DEG 57KT 4048 8876

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 27, 10:25 AM CSTRiver Flood WarningILXCrawford, Jasper35 hr
Feb 27, 10:30 AM CSTRiver Flood WarningILXPiatt24 hr
Feb 27, 10:30 AM CSTRiver Flood WarningILXFulton, Knox24 hr
Feb 27, 11:40 AM CSTSevere Thunderstorm WarningILXCass, Morgan25 min
Feb 27, 11:46 AM CSTSevere Thunderstorm WarningILXLogan, Mason, Menard44 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.