Alert archive / Illinois / Tornado Warnings in 2013

Tornado Warning 18, NWS St. Louis, MO

April 17, 2013Adams County, Brown County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 17, 2013, 8:00 PM CDT for Adams County, Brown County, Illinois. It was in force for 30 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: Apr 17, 2013, 8:00 PM CDT (01:00 UTC)
Expired: Apr 17, 2013, 8:30 PM CDT
In force: 30 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Adams County, IL, Brown County, IL

The radar

The Lincoln radar (KILX), 132 km from the middle of the area, began a volume at 01:04 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.

Issued	Product	Office	Lasted
Apr 17, 11:11 AM CDT	Tornado Watch	SPC	11 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.0 hours before the alert went out and 194 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: 412 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 356 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

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

821 
WFUS53 KLSX 180100
TORLSX
ILC001-009-180130-
/O.NEW.KLSX.TO.W.0018.130418T0100Z-130418T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
800 PM CDT WED APR 17 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS...
  NORTHWESTERN BROWN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 830 PM CDT

* AT 758 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR CLAYTON...AND MOVING NORTHEAST AT 40 MPH.

  HAZARD...DEVELOPING TORNADO.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
           SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
           OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
           EXTENSIVE TREE DAMAGE IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHERN BROWN COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4019 9091 4011 9090 4011 9072 4010 9072
      4000 9090 4009 9102 4020 9097 4020 9092
TIME...MOT...LOC 0100Z 232DEG 36KT 4005 9087

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CVKING

1 follow-up statement

599 
WWUS53 KLSX 180113
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
813 PM CDT WED APR 17 2013

ILC001-009-180123-
/O.CAN.KLSX.TO.W.0018.000000T0000Z-130418T0130Z/
ADAMS IL-BROWN IL-
813 PM CDT WED APR 17 2013

...THE TORNADO WARNING FOR NORTHWESTERN BROWN AND NORTHEASTERN ADAMS
COUNTIES IS CANCELLED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 10 PM.

LAT...LON 4019 9091 4011 9090 4011 9072 4010 9072
      4000 9090 4009 9102 4020 9097 4020 9092
TIME...MOT...LOC 0113Z 232DEG 36KT 4013 9073

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:01 PM CDT	Tornado Warning	LSX	Adams	29 min
Apr 17, 7:27 PM CDT	Tornado Warning	LSX	Adams, Brown, Pike	33 min
Apr 17, 7:46 PM CDT	Flash Flood Warning	LSX	Adams, Pike	8 hr
Apr 18, 3:32 AM CDT	Flash Flood Warning	LSX	Adams, Brown, Pike	12 hr
Apr 18, 3:58 AM CDT	Wind Advisory	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Marion and 5 more	9 hr
Apr 18, 9:10 AM CDT	Areal Flood Advisory	LSX	Monroe	7 hr
Apr 18, 10:21 AM CDT	Areal Flood Advisory	LSX	Bond, Fayette, Macoupin, Madison, Montgomery, Saint Clair	8 hr
Apr 18, 11:51 AM CDT	Flash Flood Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair	6 hr
Apr 18, 12:46 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion, Washington	44 min
Apr 18, 2:34 PM CDT	Areal Flood Advisory	LSX	Clinton, Marion, Randolph, Washington	4 hr
Apr 18, 6:01 PM CDT	Areal Flood Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair	18 hr
Apr 18, 6:55 PM CDT	Areal Flood Warning	LSX	Bond, Clinton, Fayette, Marion, Randolph, Washington	18 hr

Nearby

Tornado Warnings in Illinois, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.