Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 91, NWS Lincoln, IL

August 9, 2012McLean County, Marshall County, Woodford County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 9, 2012, 3:40 PM CDT for McLean County, Marshall County, Woodford County, Illinois. It was in force for 65 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: Aug 9, 2012, 3:40 PM CDT (20:40 UTC)
Expired: Aug 9, 2012, 4:45 PM CDT
In force: 65 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.5 in
Wind: 70.0 mph

Counties Marshall County, IL, McLean County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 20:40 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, 8.7 hours before the alert went out and 84 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: 396 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 88 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.

511 
WUUS53 KILX 092040
SVRILX
ILC113-123-203-092145-
/O.NEW.KILX.SV.W.0091.120809T2040Z-120809T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
340 PM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL MCLEAN COUNTY IN CENTRAL ILLINOIS...
  SOUTHEASTERN MARSHALL COUNTY IN CENTRAL ILLINOIS...
  NORTHEASTERN WOODFORD COUNTY IN CENTRAL ILLINOIS...

* UNTIL 445 PM CDT.

* AT 336 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
  LOCATED NEAR TOLUCA...OR 16 MILES EAST OF LACON...AND MOVING
  SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MINONK...GRIDLEY...CHENOA AND WESTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4093 8904 4093 8894 4092 8892 4076 8892
      4076 8859 4061 8857 4074 8894 4098 8922
      4109 8905
TIME...MOT...LOC 2040Z 306DEG 24KT 4099 8908
WIND...HAIL 70MPH 1.50IN

$$

CHS

3 follow-up statements

417 
WWUS53 KILX 092054
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
354 PM CDT THU AUG 9 2012

ILC123-092104-
/O.CAN.KILX.SV.W.0091.000000T0000Z-120809T2145Z/
MARSHALL IL-
354 PM CDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARSHALL COUNTY
IS CANCELLED...

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

LAT...LON 4092 8892 4076 8892 4076 8859 4061 8857
      4074 8894 4092 8905 4093 8904 4093 8894
TIME...MOT...LOC 2054Z 309DEG 27KT 4094 8897

$$

ILC113-203-092145-
/O.CON.KILX.SV.W.0091.000000T0000Z-120809T2145Z/
MCLEAN IL-WOODFORD IL-
354 PM CDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WOODFORD AND NORTH CENTRAL MCLEAN COUNTIES UNTIL 445 PM CDT...

AT 349 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL...
AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED
NEAR MINONK...OR 14 MILES SOUTHWEST OF STREATOR...MOVING SOUTHEAST AT
30 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRIDLEY...CHENOA AND WESTON.

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 4092 8892 4076 8892 4076 8859 4061 8857
      4074 8894 4092 8905 4093 8904 4093 8894
TIME...MOT...LOC 2054Z 309DEG 27KT 4094 8897
WIND...HAIL 70MPH 1.50IN

$$

CHS

837 
WWUS53 KILX 092114
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
414 PM CDT THU AUG 9 2012

ILC203-092123-
/O.CAN.KILX.SV.W.0091.000000T0000Z-120809T2145Z/
WOODFORD IL-
414 PM CDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WOODFORD COUNTY
IS CANCELLED...

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

LAT...LON 4075 8893 4076 8892 4076 8859 4061 8857
      4074 8894 4075 8895
TIME...MOT...LOC 2113Z 309DEG 27KT 4085 8882

$$

ILC113-092145-
/O.CON.KILX.SV.W.0091.000000T0000Z-120809T2145Z/
MCLEAN IL-
414 PM CDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL
MCLEAN COUNTY UNTIL 445 PM CDT...

AT 412 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING PING PONG BALL SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR FLANAGAN...OR
10 MILES WEST OF PONTIAC...MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRIDLEY...CHENOA AND WESTON.

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 4075 8893 4076 8892 4076 8859 4061 8857
      4074 8894 4075 8895
TIME...MOT...LOC 2113Z 309DEG 27KT 4085 8882
WIND...HAIL 70MPH 1.50IN

$$

CHS

657 
WWUS53 KILX 092146
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
446 PM CDT THU AUG 9 2012

ILC113-092156-
/O.EXP.KILX.SV.W.0091.000000T0000Z-120809T2145Z/
MCLEAN IL-
446 PM CDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MCLEAN COUNTY
HAS EXPIRED...

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

ANOTHER SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM 
FOR SOUTHERN MCLEAN COUNTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM.

LAT...LON 4075 8893 4076 8892 4076 8859 4061 8857
      4074 8894 4075 8895
TIME...MOT...LOC 2114Z 309DEG 27KT 4084 8881

$$

CHS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:20 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	25 min
Aug 9, 4:20 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt, McLean, Piatt	38 min
Aug 9, 5:45 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Edgar, Vermilion	60 min
Aug 9, 6:17 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Douglas, Edgar, Vermilion	58 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.