Alert archive / Illinois / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 31, NWS St. Louis, MO

April 27, 2016Calhoun County, Jersey County, Illinois; Saint Charles County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 27, 2016, 9:24 PM CDT for Calhoun County, Jersey County, Illinois; Saint Charles County, Missouri. It was in force for 38 min. 2 reports 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: Apr 27, 2016, 9:24 PM CDT (02:24 UTC)
Expired: Apr 27, 2016, 10:02 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Saint Charles County, MO

The radar

The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 02:26 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
Apr 27, 9:37 PM CDT	HAIL 1	Golden Eagle, IL
Apr 27, 10:11 PM CDT	HAIL 0.75	2 Ene Portage Des Sioux, 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
Apr 27, 2:33 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.4 hours before the alert went out and 215 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: 1 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

640 
WUUS53 KLSX 280224
SVRLSX
ILC013-083-MOC183-280315-
/O.NEW.KLSX.SV.W.0031.160428T0224Z-160428T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
924 PM CDT WED APR 27 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN JERSEY COUNTY IN SOUTHWESTERN ILLINOIS...
  SOUTHEASTERN CALHOUN COUNTY IN SOUTHWESTERN ILLINOIS...
  NORTH CENTRAL ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 1015 PM CDT

* AT 924 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ST. PAUL...
  MOVING NORTHEAST AT 25 MPH.

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

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  O'FALLON...ST. CHARLES...ST. PETERS...ST. PAUL...GRAFTON...ELSAH...
  PORTAGE DES SIOUX...ORCHARD FARMS...FIELDON...BRUSSELS...OTTERVILLE...
  MEPPEN...DEER PLAIN...GOLDEN EAGLE...NUTWOOD AND KAMPVILLE.

THIS INCLUDES INTERSTATE 70 IN MISSOURI BETWEEN EXITS 219 AND 222.
 
THIS ALSO INCLUDES  PERE MARQUETTE STATE PARK.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN ST LOUIS.

&&

LAT...LON 3877 9067 3884 9073 3914 9052 3905 9034
      3893 9028
TIME...MOT...LOC 0224Z 225DEG 22KT 3886 9063 

HAIL...1.00IN
WIND...60MPH
 
$$

GOSSELIN

2 follow-up statements

375 
WWUS53 KLSX 280248
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
948 PM CDT WED APR 27 2016

ILC013-083-MOC183-280315-
/O.CON.KLSX.SV.W.0031.000000T0000Z-160428T0315Z/
JERSEY IL-CALHOUN IL-ST. CHARLES MO-
948 PM CDT WED APR 27 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTHWESTERN JERSEY...SOUTHEASTERN CALHOUN AND NORTHEASTERN ST.
CHARLES COUNTIES...

AT 948 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED SOUTHWEST OF
GRAFTON...MOVING NORTHEAST AT 20 MPH.

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

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
GRAFTON...ELSAH...FIELDON...BRUSSELS...OTTERVILLE AND DEER PLAIN. 

THIS ALSO INCLUDES  PERE MARQUETTE STATE PARK.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
ST LOUIS.

&&

LAT...LON 3888 9053 3890 9060 3914 9052 3905 9034
      3894 9034
TIME...MOT...LOC 0248Z 238DEG 15KT 3894 9051 

HAIL...1.00IN
WIND...60MPH
 
$$

GOSSELIN

791 
WWUS53 KLSX 280302
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1002 PM CDT WED APR 27 2016

ILC013-083-MOC183-280312-
/O.CAN.KLSX.SV.W.0031.000000T0000Z-160428T0315Z/
JERSEY IL-CALHOUN IL-ST. CHARLES MO-
1002 PM CDT WED APR 27 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JERSEY...
SOUTHEASTERN CALHOUN AND NORTHEASTERN ST. CHARLES COUNTIES IS
CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER SMALL HAIL IS
STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3888 9053 3890 9060 3914 9052 3905 9034
      3894 9034
TIME...MOT...LOC 0300Z 225DEG 22KT 3900 9043 

$$

TILLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 8:48 PM CDT	Severe Thunderstorm Warning	LSX	Adams	42 min
Apr 27, 9:15 PM CDT	Tornado Warning Tornado observed	LSX	Adams	30 min
Apr 27, 9:45 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	35 min
Apr 27, 10:25 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	50 min
Apr 27, 10:26 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	34 min
Apr 27, 10:34 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	41 min
Apr 27, 10:59 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	23 min
Apr 27, 7:23 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	37 min
Apr 27, 7:39 PM CDT	Tornado Warning	LSX	Lewis, Marion	36 min
Apr 27, 7:39 PM CDT	Tornado Warning	LSX	Knox	21 min
Apr 27, 7:46 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	44 min
Apr 27, 7:59 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	46 min
Apr 27, 8:23 PM CDT	Tornado Warning	LSX	Lewis, Marion, Shelby	37 min
Apr 27, 8:30 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	30 min
Apr 27, 9:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson	34 min
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Callaway, Osage	8 days
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	8 days
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	6 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2016 Severe Thunderstorm Warnings in Missouri, 2016 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.