Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 1, NWS Lincoln, IL

February 27, 2011Cass County, Morgan County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Feb 27, 2011, 11:40 AM CST for Cass County, Morgan County, Illinois. It was in force for 25 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, 11:40 AM CST (17:40 UTC)
Expired
Feb 27, 2011, 12:05 PM CST
In force
25 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Cass County, IL, Morgan County, IL

The radar

The Lincoln radar (KILX), 75 km from the middle of the area, began a volume at 17:44 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, 5.7 hours before the alert went out and 137 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°0°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.

666 
WUUS53 KILX 271740
SVRILX
ILC017-137-271815-
/O.NEW.KILX.SV.W.0001.110227T1740Z-110227T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1140 AM CST SUN FEB 27 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASS COUNTY IN WEST CENTRAL ILLINOIS...
  NORTHWESTERN MORGAN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 1215 PM CST.

* AT 1138 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR ARENZVILLE...OR 9 MILES SOUTH OF
  BEARDSTOWN...AND MOVING NORTHEAST AT 70 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VIRGINIA...BLUFF SPRINGS...LITERBERRY...CHANDLERVILLE...
  PHILADELPHIA AND NEWMANSVILLE.

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 4006 9026 4006 9022 4007 9016 4007 9012
      4008 9011 4010 9001 3998 9000 3991 9003
      3976 9046 3989 9055
TIME...MOT...LOC 1740Z 235DEG 62KT 3991 9038
WIND...HAIL <50MPH 1.00IN

$$

HJS
1 follow-up statement
979 
WWUS53 KILX 271805
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1205 PM CST SUN FEB 27 2011

ILC017-137-271815-
/O.CAN.KILX.SV.W.0001.000000T0000Z-110227T1815Z/
MORGAN IL-CASS IL-
1205 PM CST SUN FEB 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR CASS AND NORTHWESTERN MORGAN
COUNTIES IS CANCELLED...

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

LAT...LON 4006 9026 4006 9022 4007 9016 4007 9012
      4008 9011 4010 9001 3998 9000 3991 9003
      3976 9046 3989 9055
TIME...MOT...LOC 1805Z 235DEG 62KT 4016 8992

$$

HJS

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, 11:46 AM CSTSevere Thunderstorm WarningILXLogan, Mason, Menard44 min
Feb 27, 12:21 PM CSTSevere Thunderstorm WarningILXMcLean21 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.