Alert archive / Illinois / Tornado Warnings in 2013

Tornado Warning 39, NWS St. Louis, MO

November 17, 2013Montgomery County, Illinois

NWS St. Louis, MO issued this tornado warning at Nov 17, 2013, 11:41 AM CST for Montgomery County, Illinois. It was in force for 19 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
Nov 17, 2013, 11:41 AM CST (17:41 UTC)
Expired
Nov 17, 2013, 12:00 PM CST
In force
19 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

County Montgomery County, IL

The radar

The Lincoln radar (KILX), 91 km from the middle of the area, began a volume at 17:41 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

TimeReportWhereRemark
Nov 17, 11:53 AM CSTHAIL 16 N Witt, ILESTIMATED NICKEL TO QUARTER SIZED HAIL...NEAR MONTGOMERY CHRISTIAN COUNTY LINE

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.

IssuedProductOfficeLasted
Nov 17, 8:40 AM CSTTornado Watch PDSSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.7 hours before the alert went out and 114 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, Lincoln, IL at 12:00Z on 2013-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1021 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2013-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 398 square meters per square second.1939587897117Sfc1 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
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.

283 
WFUS53 KLSX 171741
TORLSX
ILC135-171800-
/O.NEW.KLSX.TO.W.0039.131117T1741Z-131117T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1141 AM CST SUN NOV 17 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL NOON CST

* AT 1139 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR RAYMOND...AND MOVING NORTHEAST AT 65 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL.

  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...
  HARVEL...WENONAH AND OHLMAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

&&

LAT...LON 3934 8914 3923 8963 3931 8967 3938 8953
      3936 8952 3935 8914
TIME...MOT...LOC 1741Z 244DEG 55KT 3930 8956

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

$$

CVKING
1 follow-up statement
220 
WWUS53 KLSX 171756
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1156 AM CST SUN NOV 17 2013

ILC135-171807-
/O.EXP.KLSX.TO.W.0039.000000T0000Z-131117T1800Z/
MONTGOMERY IL-
1156 AM CST SUN NOV 17 2013

...THE TORNADO WARNING FOR NORTHERN MONTGOMERY COUNTY WILL EXPIRE AT
NOON CST...

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 4 PM.

LAT...LON 3934 8914 3923 8963 3931 8967 3938 8953
      3936 8952 3935 8914
TIME...MOT...LOC 1757Z 244DEG 55KT 3941 8928

$$

CVKING

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 17, 11:04 AM CSTSevere Thunderstorm WarningLSXJersey, Macoupin, Montgomery41 min
Nov 17, 11:11 AM CSTTornado WarningLSXMacoupin, Montgomery19 min
Nov 17, 11:21 AM CSTTornado WarningLSXMacoupin, Montgomery24 min
Nov 17, 11:38 AM CSTSevere Thunderstorm WarningLSXMadison, Monroe, Saint Clair37 min
Nov 17, 11:49 AM CSTTornado WarningLSXRandolph26 min
Nov 17, 11:53 AM CSTTornado WarningLSXClinton, Washington37 min
Nov 17, 11:56 AM CSTTornado WarningLSXBond, Clinton, Fayette34 min
Nov 17, 12:09 PM CSTTornado WarningLSXRandolph21 min
Nov 17, 12:14 PM CSTTornado Warning Tornado observedLSXMarion46 min
Nov 17, 12:24 PM CSTSevere Thunderstorm WarningLSXBond, Fayette, Madison, Montgomery51 min

Nearby

Tornado Warnings in Illinois, 2013Every tornado warning in 2013Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.