Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 14, NWS St. Louis, MO

April 9, 2015Fayette County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 9, 2015, 8:23 PM CDT for Fayette County, Illinois. It was in force for 14 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 9, 2015, 8:23 PM CDT (01:23 UTC)
Expired: Apr 9, 2015, 8:37 PM CDT
In force: 14 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Fayette County, IL

The radar

The Lincoln radar (KILX), 114 km from the middle of the area, began a volume at 01:24 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 9, 4:40 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.4 hours before the alert went out and 110 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: 1160 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 15.8

Open this sounding in Storm Lab

The text

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

169 
WFUS53 KLSX 100123
TORLSX
ILC051-100200-
/O.NEW.KLSX.TO.W.0014.150410T0123Z-150410T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
823 PM CDT THU APR 9 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 900 PM CDT

* AT 821 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 6 MILES EAST OF RAMSEY...AND MOVING EAST AT 45
  MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
           TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
           LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN FAYETTE 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 3914 8880 3913 8904 3922 8905 3922 8894
      3922 8881 3921 8880
TIME...MOT...LOC 0123Z 254DEG 41KT 3918 8897

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

KANOFSKY

1 follow-up statement

114 
WWUS53 KLSX 100137
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
837 PM CDT THU APR 9 2015

ILC051-100147-
/O.CAN.KLSX.TO.W.0014.000000T0000Z-150410T0200Z/
FAYETTE IL-
837 PM CDT THU APR 9 2015

...THE TORNADO WARNING FOR NORTH CENTRAL FAYETTE COUNTY IS
CANCELLED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN 
EFFECT FOR THE AREA.  HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH 
THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1100 PM.

LAT...LON 3914 8880 3913 8904 3922 8905 3922 8894
      3922 8881 3921 8880
TIME...MOT...LOC 0137Z 254DEG 41KT 3922 8877

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:04 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	26 min
Apr 9, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Madison	13 min
Apr 9, 7:26 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	34 min
Apr 9, 7:27 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Montgomery	37 min
Apr 9, 7:30 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Montgomery	30 min
Apr 9, 7:54 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	51 min
Apr 9, 8:45 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	30 min
Apr 9, 9:21 PM CDT	Severe Thunderstorm Warning	LSX	Washington	39 min
Apr 10, 12:01 PM CDT	River Flood Warning	LSX	Fayette	67 hr

Nearby

Tornado Warnings in Illinois, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.