Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 62, NWS Lincoln, IL

May 7, 2011Champaign County, Vermilion County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 7, 2011, 4:59 PM CDT for Champaign County, Vermilion County, Illinois. It was in force for 46 min. 1 report 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: May 7, 2011, 4:59 PM CDT (21:59 UTC)
Expired: May 7, 2011, 5:45 PM CDT
In force: 46 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Champaign County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 115 km from the middle of the area, began a volume at 21:59 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
May 7, 5:43 PM CDT	HAIL 1	3 S St. Joseph, 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
May 7, 2:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.0 hours before the alert went out and 53 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: 1168 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 351 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

176 
WUUS53 KILX 072159
SVRILX
ILC019-183-072245-
/O.NEW.KILX.SV.W.0062.110507T2159Z-110507T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
459 PM CDT SAT MAY 7 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

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

* UNTIL 545 PM CDT.

* AT 454 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM GIFFORD TO LAKE OF THE WOODS...
  AND MOVING SOUTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ST. JOSEPH...OGDEN...FITHIAN...OAKWOOD...FLATVILLE AND ROYAL.

THIS INCLUDES INTERSTATE 57 BETWEEN MILE MARKERS 240 AND 249.

THIS INCLUDES INTERSTATE 74 BETWEEN MILE MARKERS 183 AND 207.

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 8774 4002 8811 4026 8833 4035 8797
TIME...MOT...LOC 2159Z 330DEG 20KT 4029 8794 4021 8826
WIND...HAIL 60MPH 1.00IN

$$

CHURCHILL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 4:06 PM CDT	Tornado Warning	ILX	Champaign, Vermilion	39 min
May 7, 4:44 PM CDT	Tornado Warning	ILX	Vermilion	46 min
May 7, 5:12 PM CDT	Tornado Warning	ILX	Champaign	31 min
May 7, 5:17 PM CDT	Areal Flood Warning	ILX	Lawrence	4 days
May 7, 5:25 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	50 min
May 7, 5:39 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Vermilion	51 min
May 7, 6:03 PM CDT	Tornado Warning	ILX	Edgar, Vermilion	42 min
May 7, 6:24 PM CDT	Tornado Warning	ILX	Edgar	51 min
May 7, 6:57 PM CDT	Tornado Warning	ILX	Edgar	25 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Every 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.