Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Lincoln, IL

April 28, 2012Clay County, Effingham County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Apr 28, 2012, 6:45 PM CDT for Clay County, Effingham County, Illinois. It was in force for 60 min. 4 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: Apr 28, 2012, 6:45 PM CDT (23:45 UTC)
Expired: Apr 28, 2012, 7:45 PM CDT
In force: 60 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Clay County, IL, Effingham County, IL

The radar

The Evansville,IN radar (KVWX), 104 km from the middle of the area, began a volume at 23:45 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
Apr 28, 7:18 PM CDT	HAIL 1.5	1 E Louisville, IL
Apr 28, 7:18 PM CDT	HAIL 1.5	Iola, IL
Apr 28, 7:20 PM CDT	HAIL 1.75	1 E Louisville, IL
Apr 28, 7:20 PM CDT	HAIL 1.75	Iola, 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 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 143 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: 1019 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 681 m²/s²
0-3 km storm-relative helicity: 811 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

335 
WUUS53 KILX 282345
SVRILX
ILC025-049-290045-
/O.NEW.KILX.SV.W.0049.120428T2345Z-120429T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
645 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLAY COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHERN EFFINGHAM COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 745 PM CDT.

* AT 644 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
  THIS STORM WAS LOCATED 6 MILES SOUTH OF BROWNSTOWN...OR 11 MILES
  SOUTHEAST OF VANDALIA...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  EDGEWOOD...IOLA...LOUISVILLE...BIBLE GROVE...OSKALOOSA...MASON...
  HORD AND ELLIOTSTOWN.

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 3875 8870 3891 8870 3891 8881 3900 8881
      3903 8836 3872 8837
TIME...MOT...LOC 2345Z 271DEG 31KT 3891 8892
WIND...HAIL <50MPH 1.50IN

$$

BAK

3 follow-up statements

458 
WWUS53 KILX 290016
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
716 PM CDT SAT APR 28 2012

ILC049-290026-
/O.CAN.KILX.SV.W.0049.000000T0000Z-120429T0045Z/
EFFINGHAM IL-
716 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN EFFINGHAM COUNTY IS
CANCELLED...

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

LAT...LON 3875 8870 3891 8870 3892 8845 3891 8836
      3872 8837
TIME...MOT...LOC 0016Z 276DEG 30KT 3884 8863

$$

ILC025-290045-
/O.CON.KILX.SV.W.0049.000000T0000Z-120429T0045Z/
CLAY IL-
716 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN CLAY
COUNTY UNTIL 745 PM CDT...

AT 712 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
THIS STORM WAS LOCATED NEAR IOLA...OR 15 MILES NORTHWEST OF FLORA...
MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  LOUISVILLE...BIBLE GROVE AND HORD.

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 3875 8870 3891 8870 3892 8845 3891 8836
      3872 8837
TIME...MOT...LOC 0016Z 276DEG 30KT 3884 8863
WIND...HAIL <50MPH 1.50IN

$$

BAK

157 
WWUS53 KILX 290035
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
735 PM CDT SAT APR 28 2012

ILC025-290045-
/O.CON.KILX.SV.W.0049.000000T0000Z-120429T0045Z/
CLAY IL-
735 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN CLAY
COUNTY UNTIL 745 PM CDT...

AT 720 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL.  THIS STORM WAS LOCATED
NEAR BIBLE GROVE...OR 11 MILES NORTH OF FLORA...MOVING EAST AT 35
MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF CENTRAL CLAY COUNTY.

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 3875 8870 3891 8870 3892 8845 3891 8836
      3872 8837
TIME...MOT...LOC 0035Z 276DEG 30KT 3882 8843
WIND...HAIL <50MPH 1.75IN

$$

BAK

014 
WWUS53 KILX 290043
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
743 PM CDT SAT APR 28 2012

ILC025-290053-
/O.EXP.KILX.SV.W.0049.000000T0000Z-120429T0045Z/
CLAY IL-
743 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLAY COUNTY WILL
EXPIRE AT 745 PM CDT...

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

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
SOUTHERN CLAY COUNTY UNTIL 815 PM.

LAT...LON 3875 8870 3891 8870 3892 8845 3891 8836
      3872 8837
TIME...MOT...LOC 0043Z 276DEG 30KT 3881 8834

$$

BAK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:21 PM CDT	Special Weather Statement	ILX	Jasper	39 min
Apr 28, 3:28 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford, Cumberland, Jasper	32 min
Apr 28, 3:49 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Jasper	41 min
Apr 28, 3:57 PM CDT	Tornado Warning	ILX	Crawford	37 min
Apr 28, 4:38 PM CDT	Special Weather Statement	ILX	Sangamon	67 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every severe thunderstorm warning in 2012

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.