Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 79, NWS St. Louis, MO

April 19, 2011Monroe County, Randolph County, Saint Clair County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 6:22 AM CDT for Monroe County, Randolph County, Saint Clair County, Illinois; Jefferson County, Missouri. It was in force for 38 min. 14 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 19, 2011, 6:22 AM CDT (11:22 UTC)
Expired: Apr 19, 2011, 7:00 AM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 11:22 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 19, 6:23 AM CDT	HAIL 1.75	Hillsboro, MO	STARTED AT 618 AM AND CONTINUES....GROUND COVERED.
Apr 19, 6:24 AM CDT	HAIL 2	1 W Hillsboro, MO	ONE WINDOW WAS BROKEN BY THE HAIL.
Apr 19, 6:27 AM CDT	HAIL 1.75	Hillsboro, MO	AT JEFFERSON COLLEGE.
Apr 19, 6:29 AM CDT	HAIL 1.75	1 N Mapaville, MO
Apr 19, 6:29 AM CDT	HAIL 1.75	Hillsboro, MO
Apr 19, 6:30 AM CDT	HAIL 1	Festus, MO
Apr 19, 6:31 AM CDT	HAIL 1.75	Herculaneum, MO
Apr 19, 6:32 AM CDT	HAIL 2.75	2 Ene Mapaville, MO	UPDATE TO REPORT....2 CARS LOST WINDSHIELDS AT SANDCASTLE OFF HIGHWAY Z.
Apr 19, 6:32 AM CDT	HAIL 2.75	Pevely, MO
Apr 19, 6:36 AM CDT	HAIL 1	Crystal City, MO
Apr 19, 6:38 AM CDT	HAIL 1.75	Herculaneum, MO
Apr 19, 6:50 AM CDT	HAIL 2	Valmeyer, IL	LASTED 10 MINUTES FROM 640 TO 650 AM.
Apr 19, 7:03 AM CDT	HAIL 1.75	1 Sw New Handover, IL
Apr 19, 7:04 AM CDT	HAIL 1.75	Waterloo, 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 19, 3:11 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 11.4 hours before the alert went out and 254 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: 1035 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 347 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.

780 
WUUS53 KLSX 191122
SVRLSX
ILC133-157-163-MOC099-191200-
/O.NEW.KLSX.SV.W.0079.110419T1122Z-110419T1200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
622 AM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONROE COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...  
  SOUTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 700 AM CDT

* AT 617 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR HILLSBORO...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ANTONIA...BARNHART...FESTUS...PEVELY...HERCULANEUM...CRYSTAL
  CITY...ARNOLD...COLUMBIA...WATERLOO...MILLSTADT...RED BUD...
  VALMEYER...FOUNTAIN...NEW DESIGN...SMITHTON...OTTO...MAPAVILLE...
  HEMATITE...KIMMSWICK AND HARRISONVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3805 8993 3810 9023 3812 9025 3811 9027
      3817 9066 3841 9065 3845 9034 3842 9035
      3839 9034 3845 9029 3849 8992
TIME...MOT...LOC 1121Z 271DEG 38KT 3826 9053
WIND...HAIL <50MPH 1.75IN

$$

BRITT

1 follow-up statement

864 
WWUS53 KLSX 191134
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
634 AM CDT TUE APR 19 2011

ILC133-157-163-MOC099-191200-
/O.CON.KLSX.SV.W.0079.000000T0000Z-110419T1200Z/
RANDOLPH IL-MONROE IL-ST. CLAIR IL-JEFFERSON MO-
634 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
JEFFERSON...CENTRAL ST. CLAIR...MONROE AND NORTHWESTERN RANDOLPH
COUNTIES UNTIL 700 AM CDT...

AT 632 AM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO BASEBALL SIZE. 
THIS STORM WAS LOCATED NEAR PEVELY...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  COLUMBIA...WATERLOO...MILLSTADT...RED BUD...VALMEYER...FOUNTAIN...
  NEW DESIGN...SMITHTON...EVANSVILLE...HARRISONVILLE...CHALFIN
  BRIDGE...MONROE CITY...MADONNAVILLE...FOSTER POND...MAEYSTOWN...NEW
  HANDOVER...FULTS...WARTBURG...KIDD AND BURKSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 3805 8993 3810 9023 3812 9025 3811 9027
      3815 9055 3842 9053 3845 9034 3842 9035
      3839 9034 3842 9031 3845 9029 3849 8992
TIME...MOT...LOC 1133Z 271DEG 38KT 3826 9037
WIND...HAIL <50MPH 2.75IN

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 4:35 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Pike	40 min
Apr 19, 5:14 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Pike	31 min
Apr 19, 6:21 AM CDT	Areal Flood Advisory	LSX	Madison, Monroe, Saint Clair	3 hr
Apr 19, 6:26 AM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	49 min
Apr 19, 6:56 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	49 min
Apr 19, 7:08 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison, Montgomery	37 min
Apr 19, 7:36 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Madison, Montgomery	39 min
Apr 19, 8:07 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	38 min
Apr 19, 8:25 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	29 min
Apr 19, 8:41 AM CDT	Severe Thunderstorm Warning	LSX	Fayette	34 min
Apr 19, 11:18 AM CDT	River Flood Warning	LSX	Calhoun, Greene, Jersey	85 days
Apr 19, 3:46 PM CDT	Severe Thunderstorm Warning	LSX	Pike	44 min
Apr 19, 3:59 PM CDT	Tornado Warning	LSX	Pike	46 min
Apr 19, 4:18 PM CDT	Tornado Warning	LSX	Calhoun, Greene, Pike	42 min
Apr 19, 4:31 PM CDT	Tornado Warning	LSX	Calhoun	44 min
Apr 19, 4:41 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Madison	49 min
Apr 19, 4:59 PM CDT	Tornado Warning	LSX	Greene, Pike	46 min
Apr 19, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	47 min
Apr 19, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	47 min
Apr 19, 5:36 PM CDT	Tornado Warning	LSX	Macoupin	39 min
Apr 19, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	Greene	34 min
Apr 19, 5:44 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	34 min
Apr 19, 6:01 PM CDT	Tornado Warning	LSX	Montgomery	44 min
Apr 19, 6:05 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	40 min
Apr 19, 6:12 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	48 min
Apr 19, 6:14 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	61 min
Apr 19, 6:31 PM CDT	Tornado Warning	LSX	Montgomery	27 min
Apr 19, 6:56 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Madison, Montgomery	64 min
Apr 19, 2:51 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau, Osage	39 min
Apr 19, 3:19 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	41 min
Apr 19, 3:26 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Osage	49 min
Apr 19, 3:39 AM CDT	Severe Thunderstorm Warning	LSX	Moniteau	21 min
Apr 19, 3:57 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 4 more	48 min
Apr 19, 4:43 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Warren	47 min
Apr 19, 4:58 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	32 min
Apr 19, 5:23 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Saint Charles, Warren, Washington	37 min
Apr 19, 5:43 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Washington	47 min
Apr 19, 8:05 AM CDT	River Flood Warning	LSX	Saint Charles	30 hr
Apr 19, 11:06 AM CDT	River Flood Warning	LSX	Lincoln	19 days
Apr 19, 11:33 AM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	30 days
Apr 19, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Montgomery, Pike	42 min
Apr 19, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Osage	51 min
Apr 19, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Franklin, Gasconade, Osage	51 min
Apr 19, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery, Warren	44 min
Apr 19, 5:01 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Saint Charles, Warren	44 min
Apr 19, 5:13 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Saint Charles, Warren	47 min
Apr 19, 5:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Warren	34 min
Apr 19, 5:58 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	32 min
Apr 19, 6:14 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	31 min
Apr 19, 6:15 PM CDT	Severe Thunderstorm Warning	LSX	Reynolds	60 min
Apr 19, 6:30 PM CDT	Flash Flood Warning	LSX	Saint Charles	3 hr
Apr 19, 6:37 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois, Washington	53 min
Apr 19, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles	30 min
Apr 19, 6:51 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	39 min
Apr 19, 6:56 PM CDT	Areal Flood Advisory	LSX	Franklin, Warren	5 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Severe Thunderstorm Warnings in Missouri, 2011 Every severe thunderstorm warning in 2011

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.