Alert archive / Illinois / Tornado Warnings in 2015

Tornado Warning 13, NWS St. Louis, MO

April 9, 2015Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 9, 2015, 7:26 PM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 34 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: Apr 9, 2015, 7:26 PM CDT (00:26 UTC)
Expired: Apr 9, 2015, 8:00 PM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

Counties Macoupin County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 00:27 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
Apr 9, 7:55 PM CDT	TSTM WND GST 51	1 Sw Litchfield, 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
Apr 9, 4:40 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.4 hours before the alert went out and 145 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.

684 
WFUS53 KLSX 100026
TORLSX
ILC117-135-100100-
/O.NEW.KLSX.TO.W.0013.150410T0026Z-150410T0100Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 800 PM CDT

* AT 724 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR MOUNT OLIVE...AND MOVING EAST AT 45 MPH.

  HAZARD...TORNADO AND GOLF BALL SIZE HAIL.

  SOURCE...WEATHER SPOTTERS REPORTED FUNNEL CLOUD.

  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...
  LITCHFIELD...HILLSBORO...TAYLOR SPRINGS...COFFEEN...WALSHVILLE...
  BUTLER...PANAMA...DONNELLSON AND IRVING.

THIS WARNING ALSO INCLUDES...
INTERSTATE 55 IN ILLINOIS NEAR EXIT 52.

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 3903 8958 3902 8959 3902 8974 3922 8974
      3922 8939 3903 8936
TIME...MOT...LOC 0026Z 268DEG 39KT 3909 8968

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

KANOFSKY

1 follow-up statement

379 
WWUS53 KLSX 100055 RRA
SVSLSX

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

ILC117-135-100106-
/O.EXP.KLSX.TO.W.0013.000000T0000Z-150410T0100Z/
MACOUPIN IL-MONTGOMERY IL-
755 PM CDT THU APR 9 2015

...THE TORNADO WARNING FOR SOUTHWESTERN MONTGOMERY AND SOUTHEASTERN
MACOUPIN COUNTIES WILL EXPIRE AT 800 PM CDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 11 PM.

LAT...LON 3903 8958 3902 8959 3902 8974 3922 8974
      3922 8939 3903 8936
TIME...MOT...LOC 0056Z 268DEG 39KT 3910 8926

$$

KANOFSKY

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, 7:27 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, 8:23 PM CDT	Tornado Warning	LSX	Fayette	14 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.