Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 55, NWS St. Louis, MO

March 15, 2012Greene County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 15, 2012, 5:52 PM CDT for Greene County, Illinois. It was in force for 38 min. 2 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: Mar 15, 2012, 5:52 PM CDT (22:52 UTC)
Expired: Mar 15, 2012, 6:30 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 2.75 in
Wind: 60.0 mph

County Greene County, IL

The radar

The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 22:53 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
Mar 15, 5:53 PM CDT	HAIL 1.75	2 E Carrollton, IL
Mar 15, 5:54 PM CDT	HAIL 2.75	Carrollton, IL	HAIL REPORTED FROM PEA TO BASEBALL SIZE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 168 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: 1579 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 117 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.

157 
WUUS53 KLSX 152252
SVRLSX
ILC061-152330-
/O.NEW.KLSX.SV.W.0055.120315T2252Z-120315T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
552 PM CDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 630 PM CDT

* AT 548 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A SEVERE
  THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO BASEBALL
  SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR CARROLLTON...OR 11 MILES NORTH OF JERSEYVILLE...AND
  MOVING NORTHEAST AT 25 MPH.

  AT 545 PM BASEBALL SIZE HAIL WAS REPORTED IN CARROLLTON WITH
  THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  GREENFIELD...ATHENSVILLE...WRIGHTS AND ROCKBRIDGE.

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.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 3952 9015 3926 9015 3926 9020 3923 9020
      3922 9027 3922 9031 3921 9039 3931 9043
      3953 9028
TIME...MOT...LOC 2252Z 239DEG 21KT 3928 9038
WIND...HAIL 60MPH 2.75IN

$$

MILLER

3 follow-up statements

225 
WWUS53 KLSX 152306
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
606 PM CDT THU MAR 15 2012

ILC061-152330-
/O.CON.KLSX.SV.W.0055.000000T0000Z-120315T2330Z/
GREENE IL-
606 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GREENE COUNTY UNTIL 630 PM CDT...

AT 554 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO BASEBALL SIZE...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6
MILES EAST OF CARROLLTON...OR 11 MILES NORTH OF JERSEYVILLE...MOVING
EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  GREENFIELD AND ROCKBRIDGE.

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.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3941 9015 3926 9015 3926 9020 3923 9020
      3922 9026 3922 9031 3926 9034 3933 9033
TIME...MOT...LOC 2306Z 260DEG 20KT 3928 9028
WIND...HAIL 60MPH 2.75IN

$$

MILLER

146 
WWUS53 KLSX 152317
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
617 PM CDT THU MAR 15 2012

ILC061-152330-
/O.CON.KLSX.SV.W.0055.000000T0000Z-120315T2330Z/
GREENE IL-
617 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GREENE COUNTY UNTIL 630 PM CDT...

AT 613 PM CDT...EMERGENCY MANAGEMENT REPORTED A SEVERE THUNDERSTORM
PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THIS STORM WAS LOCATED NEAR GREENFIELD...OR 13 MILES NORTHEAST
OF JERSEYVILLE...MOVING EAST AT 25 MPH.

IN ADDITION...AT 615 PM GOLF BALL SIZE HAIL WAS REPORTED NEAR GREENFIELD
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN GREENE 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.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3940 9015 3926 9015 3926 9020 3927 9026
      3933 9028 3940 9016
TIME...MOT...LOC 2317Z 260DEG 20KT 3929 9020
WIND...HAIL 60MPH 1.75IN

$$

MILLER

400 
WWUS53 KLSX 152330
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
630 PM CDT THU MAR 15 2012

ILC061-152340-
/O.EXP.KLSX.SV.W.0055.000000T0000Z-120315T2330Z/
GREENE IL-
630 PM CDT THU MAR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GREENE COUNTY HAS
EXPIRED...

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

LAT...LON 3940 9015 3926 9015 3926 9020 3927 9026
      3933 9028 3940 9016
TIME...MOT...LOC 2317Z 260DEG 20KT 3929 9020

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 14, 7:00 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	45 min
Mar 14, 7:41 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	31 min
Mar 15, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Madison	33 min
Mar 15, 4:46 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	29 min
Mar 15, 5:17 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	43 min
Mar 15, 6:16 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	44 min
Mar 15, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Pike	29 min
Mar 15, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	15 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.