Alert archive / Illinois / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Lincoln, IL

May 8, 2009Stark County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 8, 2009, 8:55 PM CDT for Stark County, Illinois. It was in force for 35 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
May 8, 2009, 8:55 PM CDT (01:55 UTC)
Expired
May 8, 2009, 9:30 PM CDT
In force
35 min
Issued by
NWS Lincoln, IL
Area
Storm-based polygon

County Stark County, IL

The radar

The Quad Cities radar (KDVN), 84 km from the middle of the area, began a volume at 01:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 8, 6:10 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.9 hours before the alert went out and 79 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2009-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 354 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2009-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
354 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1505 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KILX 090155
SVRILX
ILC175-090230-
/O.NEW.KILX.SV.W.0021.090509T0155Z-090509T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
855 PM CDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STARK COUNTY IN NORTH CENTRAL ILLINOIS...

* UNTIL 930 PM CDT.

* AT 855 PM 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 LA
  FAYETTE...OR ABOUT 9 MILES SOUTHWEST OF KEWANEE...AND WAS MOVING
  EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TOULON...
  ELMIRA...
  WYOMING...
  OSCEOLA...
  CASTLETON...
  BRADFORD...

ANOTHER LOCATION IN THIS WARNING IS...WEST JERSEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 4124 8964 4118 8965 4098 8966 4099 8999
      4115 8999 4116 8988 4124 8988
TIME...MOT...LOC 0155Z 280DEG 44KT 4112 8995

$$

CHS
2 follow-up statements
000 
WWUS53 KILX 090218
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
918 PM CDT FRI MAY 8 2009

ILC175-090230-
/O.CON.KILX.SV.W.0021.000000T0000Z-090509T0230Z/
STARK IL-
918 PM CDT FRI MAY 8 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR STARK COUNTY...

AT 917 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR ELMIRA...OR 10 MILES SOUTHEAST OF KEWANEE...MOVING EAST AT 40
MPH.

LOCATIONS NEAR THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
CASTLETON...BRADFORD AND LOMBARDVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 4124 8964 4118 8965 4098 8966 4099 8999
      4115 8999 4116 8988 4124 8988
TIME...MOT...LOC 0218Z 276DEG 35KT 4114 8978

$$

CHS
000 
WWUS53 KILX 090229
SVSILX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
929 PM CDT FRI MAY 8 2009

ILC175-090238-
/O.EXP.KILX.SV.W.0021.000000T0000Z-090509T0230Z/
STARK IL-
929 PM CDT FRI MAY 8 2009

...THE SEVERE THUNDERSTORM WARNING FOR STARK COUNTY EXPIRES AT 930 PM
CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND NO LONGER
APPEARED TO BE SEVERE.

A SEPARATE SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE 
SOUTHERN PART OF THE COUNTY UNTIL 1000 PM CDT.

LAT...LON 4124 8964 4118 8965 4098 8966 4099 8999
      4115 8999 4116 8988 4124 8988
TIME...MOT...LOC 0228Z 276DEG 35KT 4112 8965

$$

CHS

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 8:29 PM CDTSevere Thunderstorm WarningILXKnox46 min
May 8, 9:15 PM CDTSevere Thunderstorm WarningILXKnox, Peoria, Stark31 min
May 8, 9:44 PM CDTRiver Flood WarningILXClay, Richland3 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2009Every severe thunderstorm warning in 2009

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.