Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 86, NWS Lincoln, IL

July 31, 2012Vermilion County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 31, 2012, 10:20 AM CDT for Vermilion County, Illinois. It was in force for 29 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: Jul 31, 2012, 10:20 AM CDT (15:20 UTC)
Expired: Jul 31, 2012, 10:49 AM CDT
In force: 29 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Vermilion County, IL

The radar

The Lincoln radar (KILX), 125 km from the middle of the area, began a volume at 15:20 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
Jul 31, 10:22 AM CDT	HAIL 0.88	1 Nnw Fithian, IL	PEA TO NICKEL SIZE HAIL
Jul 31, 10:23 AM CDT	HAIL 0.25	3 E Ogden, IL	INTERSECTION OF HIGHWAYS 49 AND 150
Jul 31, 10:27 AM CDT	HAIL 1.25	1 W Fithian, IL

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, 3.3 hours before the alert went out and 63 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: 2241 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

678 
WUUS53 KILX 311520
SVRILX
ILC183-311600-
/O.NEW.KILX.SV.W.0086.120731T1520Z-120731T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1020 AM CDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN VERMILION COUNTY IN EAST CENTRAL ILLINOIS...

* UNTIL 1100 AM CDT.

* AT 1016 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  FITHIAN...OR 15 MILES WEST OF DANVILLE...AND MOVING SOUTH AT 30
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  FITHIAN...OAKWOOD...FAIRMOUNT...ALLERTON...SIDELL...JAMAICA AND
  INDIANOLA.

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 3988 8767 3988 8794 3999 8794 4004 8795
      4018 8794 4019 8795 4022 8794 4023 8783
TIME...MOT...LOC 1520Z 340DEG 26KT 4013 8788
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

970 
WWUS53 KILX 311549
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1049 AM CDT TUE JUL 31 2012

ILC183-311559-
/O.CAN.KILX.SV.W.0086.000000T0000Z-120731T1600Z/
VERMILION IL-
1049 AM CDT TUE JUL 31 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN VERMILION COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 3988 8767 3988 8794 3999 8794 4004 8795
      4018 8794 4019 8795 4022 8794 4023 8783
TIME...MOT...LOC 1549Z 340DEG 26KT 3993 8779

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 9:07 AM CDT	Special Weather Statement	ILX	Vermilion	53 min
Jul 31, 9:34 AM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	41 min
Jul 31, 12:57 PM CDT	Severe Thunderstorm Warning	ILX	Champaign	49 min
Jul 31, 3:54 PM CDT	Special Weather Statement	ILX	Champaign	51 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.