Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 3, NWS St. Louis, MO

February 20, 20144 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 20, 2014, 2:58 PM CST for 4 counties in Illinois. It was in force for 47 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: Feb 20, 2014, 2:58 PM CST (20:58 UTC)
Expired: Feb 20, 2014, 3:45 PM CST
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Greene County, IL, Jersey County, IL, Macoupin County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 20:59 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
Feb 20, 3:30 PM CST	TSTM WND GST 52	Plainview, 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
Feb 20, 1:36 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.0 hours before the alert went out and 143 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 507 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 582 m²/s²
0-3 km storm-relative helicity: 576 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

165 
WUUS53 KLSX 202058
SVRLSX
ILC061-083-117-135-202145-
/O.NEW.KLSX.SV.W.0003.140220T2058Z-140220T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
258 PM CST THU FEB 20 2014

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 345 PM CST

* AT 254 PM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 5 MILES EAST OF CARROLLTON TO GRAFTON...AND MOVING
  NORTHEAST AT 70 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL.

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  JERSEYVILLE...STAUNTON...GILLESPIE...CARLINVILLE...LITCHFIELD...
  VIRDEN...GREENFIELD...ATHENSVILLE...BRIGHTON...KEMPER...SHIPMAN...
  BUNKER HILL...PALMYRA...WILSONVILLE...BENLD...MOUNT OLIVE...
  GIRARD...RAYMOND...FARMERSVILLE AND WHITE OAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

LAT...LON 3900 8959 3899 9052 3952 9030 3953 8953
      3936 8953 3935 8949
TIME...MOT...LOC 2058Z 230DEG 61KT 3934 9024 3906 9043

HAIL...0.75IN
WIND...60MPH

$$

BRITT

2 follow-up statements

508 
WWUS53 KLSX 202122
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
322 PM CST THU FEB 20 2014

ILC061-083-202131-
/O.CAN.KLSX.SV.W.0003.000000T0000Z-140220T2145Z/
JERSEY IL-GREENE IL-
322 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GREENE AND JERSEY
COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.

LAT...LON 3900 8959 3900 9015 3952 9014 3953 8954
      3936 8953 3934 8949
TIME...MOT...LOC 2121Z 246DEG 50KT 3948 8990 3923 9003

$$

ILC117-135-202145-
/O.CON.KLSX.SV.W.0003.000000T0000Z-140220T2145Z/
MACOUPIN IL-MONTGOMERY IL-
322 PM CST THU FEB 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
MONTGOMERY AND MACOUPIN COUNTIES UNTIL 345 PM CST...

AT 319 PM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM PALMYRA TO 6 MILES EAST OF KEMPER...AND MOVING
NORTHEAST AT 55 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

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

LOCATIONS IMPACTED INCLUDE...
STAUNTON...GILLESPIE...VIRDEN...CARLINVILLE...LITCHFIELD...
WILSONVILLE...BENLD...MOUNT OLIVE...GIRARD...FARMERSVILLE...WHITE
OAK...RAYMOND...PRUETT...DORCHESTER...WHITE CITY...NILWOOD...
HORNSBY...STANDARD CITY...WALSHVILLE AND ATWATER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

LAT...LON 3900 8959 3900 9015 3952 9014 3953 8954
      3936 8953 3934 8949
TIME...MOT...LOC 2121Z 246DEG 50KT 3948 8990 3923 9003

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

$$

BRITT

133 
WWUS53 KLSX 202144
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
344 PM CST THU FEB 20 2014

ILC117-135-202154-
/O.EXP.KLSX.SV.W.0003.000000T0000Z-140220T2145Z/
MACOUPIN IL-MONTGOMERY IL-
344 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY AND MACOUPIN 
COUNTIES IS BEING REISSUED...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

LAT...LON 3900 8959 3900 9015 3952 9014 3953 8954
      3936 8953 3934 8949
TIME...MOT...LOC 2144Z 246DEG 50KT 3961 8952 3936 8965

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 4:22 AM CST	Wind Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	20 hr
Feb 20, 1:44 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	46 min
Feb 20, 2:25 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	35 min
Feb 20, 3:25 PM CST	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Madison	50 min
Feb 20, 3:42 PM CST	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	48 min
Feb 20, 3:55 PM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette	50 min
Feb 20, 4:01 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	44 min
Feb 20, 4:10 PM CST	Tornado Warning	LSX	Fayette, Montgomery	20 min
Feb 20, 4:23 PM CST	Severe Thunderstorm Warning	LSX	Fayette	52 min
Feb 20, 4:35 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion, Randolph, Washington	40 min
Feb 20, 4:40 PM CST	Tornado Warning	LSX	Fayette	35 min
Feb 20, 5:09 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion, Washington	51 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

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.