Alert archive / Illinois / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 71, NWS St. Louis, MO

May 24, 2015Clinton County, Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 24, 2015, 9:27 PM CDT for Clinton County, Madison County, Saint Clair County, Illinois. It was in force for 48 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: May 24, 2015, 9:27 PM CDT (02:27 UTC)
Expired: May 24, 2015, 10:15 PM CDT
In force: 48 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, IL, Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 02:27 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
May 24, 9:40 PM CDT	TSTM WND DMG	Troy, IL	SEVERAL TREES AND TREE LIMBS BLOWN DOWN.

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
May 24, 4:14 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 201 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: 169 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1620 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

931 
WUUS53 KLSX 250227
SVRLSX
ILC027-119-163-250315-
/O.NEW.KLSX.SV.W.0071.150525T0227Z-150525T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
927 PM CDT SUN MAY 24 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 1015 PM CDT

* AT 925 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM GLEN CARBON TO SHILOH TO NEW ATHENS...AND MOVING
  NORTHEAST AT 25 MPH.

  HAZARD...60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  GLEN CARBON...FREEBURG...SHILOH...O'FALLON...EDWARDSVILLE...TROY...
  SCOTT AFB...LEBANON...MASCOUTAH...NEW BADEN...HIGHLAND...ST.
  JACOB...MARINE...ALHAMBRA...TRENTON...NEW MEMPHIS...ALBERS...
  AVISTON...KUHN AND FRUIT.

THIS WARNING ALSO INCLUDES...
INTERSTATE 70 IN ILLINOIS FROM EXIT 21 TO EXIT 30.
INTERSTATE 55 IN ILLINOIS FROM EXIT 23 TO EXIT 30.
INTERSTATE 64 IN ILLINOIS FROM EXIT 12 TO EXIT 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

INTENSE SQUALL LINES CAN SOMETIMES PRODUCE BRIEF TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH A TORNADO IS NOT
IMMEDIATELY LIKELY...IT IS BEST TO MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A BUILDING. THIS STORM MAY CAUSE SERIOUS INJURY AND
SIGNIFICANT PROPERTY DAMAGE.

&&

LAT...LON 3831 8992 3831 8999 3831 9000 3878 9009
      3900 8964 3888 8964 3887 8962 3874 8959
      3848 8958
TIME...MOT...LOC 0227Z 228DEG 21KT 3875 8998 3851 8992
          3831 8993

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH

$$

GKS

2 follow-up statements

433 
WWUS53 KLSX 250247
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
947 PM CDT SUN MAY 24 2015

ILC027-119-163-250315-
/O.CON.KLSX.SV.W.0071.000000T0000Z-150525T0315Z/
MADISON IL-ST. CLAIR IL-CLINTON IL-
947 PM CDT SUN MAY 24 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
CLINTON...EASTERN ST. CLAIR AND EASTERN MADISON COUNTIES UNTIL 1015
PM CDT...

AT 943 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM CARPENTER TO ST. JACOB TO SCOTT AFB TO NEW ATHENS...
AND MOVING NORTHEAST AT 25 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
MASCOUTAH...NEW BADEN...HIGHLAND...MARINE...ST. JACOB...ALHAMBRA...
NEW MEMPHIS...TRENTON...ALBERS...AVISTON...HAMEL...KAUFMAN...
SUMMERFIELD...GRANTFORK...NEW DOUGLAS AND DAMIANSVILLE.

THIS WARNING ALSO INCLUDES...
INTERSTATE 70 IN ILLINOIS FROM EXIT 21 TO EXIT 30.
INTERSTATE 55 IN ILLINOIS FROM EXIT 23 TO EXIT 30.
INTERSTATE 64 IN ILLINOIS FROM EXIT 14 TO EXIT 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

INTENSE SQUALL LINES CAN SOMETIMES PRODUCE BRIEF TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH A TORNADO IS NOT
IMMEDIATELY LIKELY...IT IS BEST TO MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A BUILDING. THIS STORM MAY CAUSE SERIOUS INJURY AND
SIGNIFICANT PROPERTY DAMAGE.

&&

LAT...LON 3847 8962 3831 8992 3831 8996 3880 9004
      3900 8964 3888 8964 3887 8962 3874 8959
      3848 8958
TIME...MOT...LOC 0246Z 228DEG 21KT 3887 8986 3873 8981
          3858 8981 3838 8981

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH

$$

GKS

516 
WWUS53 KLSX 250318
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1018 PM CDT SUN MAY 24 2015

ILC027-119-163-250328-
/O.EXP.KLSX.SV.W.0071.000000T0000Z-150525T0315Z/
MADISON IL-ST. CLAIR IL-CLINTON IL-
1018 PM CDT SUN MAY 24 2015

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CLINTON...EASTERN ST.
CLAIR AND EASTERN MADISON COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.  HOWEVER...HEAVY RAIN IS STILL POSSIBLE WITH THESE
THUNDERSTORMS.

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

LAT...LON 3847 8962 3831 8992 3831 8996 3880 9004
      3900 8964 3888 8964 3887 8962 3874 8959
      3848 8958
TIME...MOT...LOC 0247Z 228DEG 21KT 3887 8985 3873 8980
          3858 8980 3838 8980

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 24, 8:52 PM CDT	Tornado Warning	LSX	Saint Clair	23 min
May 24, 10:15 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison, Marion, Montgomery and 1 more	45 min
May 24, 10:59 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	22 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2015 Every severe thunderstorm warning 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.