Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 6, NWS St. Louis, MO

February 27, 2011Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 27, 2011, 8:14 PM CST for Brown County, Illinois. It was in force for 16 min. 3 reports 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
Feb 27, 2011, 8:14 PM CST (02:14 UTC)
Expired
Feb 27, 2011, 8:30 PM CST
In force
16 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Brown County, IL

The radar

The Lincoln radar (KILX), 116 km from the middle of the area, began a volume at 02:14 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

TimeReportWhereRemark
Feb 27, 8:20 PM CSTTSTM WND GST 603 S Mount Sterling, IL
Feb 27, 8:20 PM CSTTSTM WND GST 751 S Mount Sterling, IL
Feb 27, 8:20 PM CSTHAIL 13 S Mount Sterling, 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.

IssuedProductOfficeLasted
Feb 27, 5:33 PM CSTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.2 hours before the alert went out and 179 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 00:00Z on 2011-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 124 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2011-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.1939587897117Sfc1 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
124 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
494 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

868 
WUUS53 KLSX 280214
SVRLSX
ILC009-280230-
/O.NEW.KLSX.SV.W.0006.110228T0214Z-110228T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
814 PM CST SUN FEB 27 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 830 PM CST

* AT 812 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR BUCKHORN...OR 18 MILES
  SOUTHWEST OF RUSHVILLE...AND MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOUNT STERLING...VERSAILLES...COOPERTOWN AND RIPLEY.

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 4011 9070 4008 9070 4007 9067 4005 9068
      4003 9061 3999 9060 3999 9051 3997 9051
      3991 9054 3988 9064 3984 9087 3991 9092
      4004 9092 4011 9079
TIME...MOT...LOC 0214Z 240DEG 54KT 3998 9080
WIND...HAIL 60MPH <.75IN

$$

CARNEY

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 27, 6:26 PM CSTSevere Thunderstorm WarningLSXAdams, Brown, Pike49 min
Feb 27, 7:38 PM CSTSevere Thunderstorm WarningLSXAdams, Brown, Pike37 min
Feb 27, 8:02 PM CSTTornado WarningLSXPike28 min
Feb 27, 8:25 PM CSTSevere Thunderstorm WarningLSXCalhoun, Pike35 min
Feb 27, 9:50 PM CSTSevere Thunderstorm WarningLSXAdams, Pike40 min
Feb 27, 10:30 PM CSTSevere Thunderstorm WarningLSXPike18 min
Feb 27, 10:47 PM CSTTornado WarningLSXMonroe, Saint Clair43 min
Feb 27, 11:18 PM CSTTornado WarningLSXMadison, Monroe, Saint Clair42 min
Feb 27, 11:43 PM CSTTornado WarningLSXBond, Clinton, Fayette, Madison, Saint Clair, Washington47 min
Feb 28, 12:07 AM CSTTornado WarningLSXBond, Clinton, Fayette, Marion, Washington38 min
Feb 28, 12:23 AM CSTSevere Thunderstorm WarningLSXRandolph52 min
Feb 28, 2:19 AM CSTRiver Flood WarningLSXJersey4 days
Feb 28, 6:46 AM CSTRiver Flood WarningLSXPike29 hr
Feb 28, 6:46 AM CSTRiver Flood WarningLSXPike38 hr
Feb 28, 6:46 AM CSTRiver Flood WarningLSXCalhoun52 hr
Feb 28, 11:14 AM CSTRiver Flood WarningLSXMorgan, Pike17 days
Feb 28, 11:43 AM CSTRiver Flood WarningLSXCalhoun47 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.