Alert archive / Illinois / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 4, NWS St. Louis, MO

February 20, 2016Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 20, 2016, 7:30 PM CST for Randolph County, Illinois. It was in force for 30 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
Feb 20, 2016, 7:30 PM CST (01:30 UTC)
Expired
Feb 20, 2016, 8:00 PM CST
In force
30 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Randolph County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.5 hours before the alert went out and 250 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 00:00Z on 2016-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2016-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2731 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

503 
WUUS53 KLSX 210130
SVRLSX
ILC157-210200-
/O.NEW.KLSX.SV.W.0004.160221T0130Z-160221T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
730 PM CST SAT FEB 20 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN RANDOLPH COUNTY IN SOUTHWESTERN ILLINOIS...

* UNTIL 800 PM CST

* AT 729 PM CST...A SEVERE THUNDERSTORM WAS LOCATED NEAR BALDWIN...
  MOVING EAST AT 30 MPH.

  HAZARD...QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED. 

* LOCATIONS IMPACTED INCLUDE...
  SPARTA...STEELEVILLE...PERCY...COULTERVILLE...TILDEN...BALDWIN...
  EDEN...PRESTON...BLAIR...HOUSTON AND WALSH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3803 8992 3821 8990 3822 8959 3798 8960
TIME...MOT...LOC 0129Z 275DEG 26KT 3812 8982 

HAIL...1.00IN
WIND...<50MPH
 
$$

CARNEY
1 follow-up statement
329 
WWUS53 KLSX 210153
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
753 PM CST SAT FEB 20 2016

ILC157-210203-
/O.EXP.KLSX.SV.W.0004.000000T0000Z-160221T0200Z/
RANDOLPH IL-
753 PM CST SAT FEB 20 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RANDOLPH COUNTY
WILL EXPIRE AT 800 PM CST...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER SMALL HAIL
AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3803 8992 3821 8990 3822 8959 3798 8960
TIME...MOT...LOC 0152Z 275DEG 26KT 3812 8982 

$$

CARNEY

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 20, 6:46 PM CSTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair44 min
Feb 20, 9:07 PM CSTAreal Flood AdvisoryLSXMonroe4 hr
Feb 20, 9:22 PM CSTFlash Flood WarningLSXMonroe, Saint Clair4 hr
Feb 20, 11:11 PM CSTAreal Flood AdvisoryLSXBond4 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2016Every severe thunderstorm warning in 2016

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.