Alert archive / Illinois / Tornado Warnings in 2013

Tornado Warning 37, NWS St. Louis, MO

November 17, 2013Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Nov 17, 2013, 11:11 AM CST for Macoupin County, Montgomery County, Illinois. It was in force for 19 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: Nov 17, 2013, 11:11 AM CST (17:11 UTC)
Expired: Nov 17, 2013, 11:30 AM CST
In force: 19 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Macoupin County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 17:12 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
Nov 17, 8:40 AM CST	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.2 hours before the alert went out and 130 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: 1021 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 398 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 11.0

Open this sounding in Storm Lab

The text

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

654 
WFUS53 KLSX 171711
TORLSX
ILC117-135-171730-
/O.NEW.KLSX.TO.W.0037.131117T1711Z-131117T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1111 AM CST SUN NOV 17 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  EXTREME NORTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1130 AM CST

* AT 1106 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR PALMYRA...AND MOVING NORTHEAST AT 65 MPH.

  HAZARD...TORNADO.

  SOURCE...RADAR INDICATED ROTATION.

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

* LOCATIONS IMPACTED INCLUDE...
  VIRDEN...GIRARD AND WHITE OAK.

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 3935 8992 3951 9004 3953 9000 3953 8955
      3952 8954
TIME...MOT...LOC 1710Z 238DEG 55KT 3949 8987

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

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 17, 11:04 AM CST	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Montgomery	41 min
Nov 17, 11:21 AM CST	Tornado Warning	LSX	Macoupin, Montgomery	24 min
Nov 17, 11:38 AM CST	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	37 min
Nov 17, 11:41 AM CST	Tornado Warning	LSX	Montgomery	19 min
Nov 17, 11:49 AM CST	Tornado Warning	LSX	Randolph	26 min
Nov 17, 11:53 AM CST	Tornado Warning	LSX	Clinton, Washington	37 min
Nov 17, 11:56 AM CST	Tornado Warning	LSX	Bond, Clinton, Fayette	34 min
Nov 17, 12:09 PM CST	Tornado Warning	LSX	Randolph	21 min
Nov 17, 12:14 PM CST	Tornado Warning Tornado observed	LSX	Marion	46 min
Nov 17, 12:24 PM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette, Madison, Montgomery	51 min

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.