Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 76, NWS St. Louis, MO

April 19, 2011Greene County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 5:14 AM CDT for Greene County, Pike County, Illinois. It was in force for 31 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
Apr 19, 2011, 5:14 AM CDT (10:14 UTC)
Expired
Apr 19, 2011, 5:45 AM CDT
In force
31 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.75 in
Wind
50.0 mph

Counties Greene County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 89 km from the middle of the area, began a volume at 10:17 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 19, 3:11 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 10.2 hours before the alert went out and 180 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 2011-04-19Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 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
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.

065 
WUUS53 KLSX 191014
SVRLSX
ILC061-149-191045-
/O.NEW.KLSX.SV.W.0076.110419T1014Z-110419T1045Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 545 AM CDT

* AT 512 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED 6 MILES NORTHEAST OF BELLEVIEW...OR 14 MILES
  SOUTH OF PITTSFIELD...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ROODHOUSE...BEECREEK...PEARL...BEDFORD...HILLVIEW...MONTEZUMA...
  PATTERSON AND BARROW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3953 9058 3953 9017 3951 9015 3939 9062
      3939 9066 3945 9083 3958 9058
TIME...MOT...LOC 1014Z 244DEG 29KT 3943 9071
WIND...HAIL <50MPH 1.75IN

$$

TRUETT
2 follow-up statements
890 
WWUS53 KLSX 191034
SVSLSX

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

ILC061-149-191045-
/O.CON.KLSX.SV.W.0076.000000T0000Z-110419T1045Z/
GREENE IL-PIKE IL-
534 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
GREENE COUNTY IN SOUTHWEST ILLINOIS...AND SOUTHEASTERN PIKE COUNTY IN
WEST CENTRAL ILLINOIS UNTIL 545 AM CDT...

AT 529 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL UP TO
TENNIS BALL SIZE.  THIS STORM WAS LOCATED 9 MILES SOUTHWEST OF
ALSEY...OR 9 MILES WEST OF WHITE HALL...MOVING NORTHEAST AT 35 MPH.
PEOPLE IN THE PATH OF THIS STORM ARE URGED TO STAY AWAY FROM 
WINDOWS...AND MOVE TO THE CENTER OF THEIR HOME OR APARTMENT.   

LOCATIONS IMPACTED INCLUDE...
  ROODHOUSE...PATTERSON AND BARROW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3953 9058 3953 9020 3945 9046 3943 9062
      3952 9070 3958 9058
TIME...MOT...LOC 1033Z 244DEG 29KT 3950 9053
WIND...HAIL <50MPH 2.50IN

$$

TRUETT
794 
WWUS53 KLSX 191047
SVSLSX

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

ILC061-149-191056-
/O.EXP.KLSX.SV.W.0076.000000T0000Z-110419T1045Z/
GREENE IL-PIKE IL-
547 AM CDT TUE APR 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GREENE COUNTY IN
SOUTHWEST ILLINOIS...AND SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL
ILLINOIS HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING WAS ALONG THE GREENE-SCOTT 
COUNTY LINE...AND WAS MOVING NORTHEAST INTO SCOTT AND MORGAN 
COUNTIES.  A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
SOUTHERN SCOTT AND SOUTHEAST MORGAN COUNTIES UNTIL 615 AM.   

ADDITIONAL SEVERE WEATHER IS POSSIBLE...AND A SEVERE THUNDERSTORM 
WATCH IS IN EFFECT UNTIL 11 AM.   

LAT...LON 3953 9058 3953 9020 3945 9046 3943 9062
      3952 9070 3958 9058
TIME...MOT...LOC 1034Z 244DEG 29KT 3950 9052

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 4:35 AM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Pike40 min
Apr 19, 6:21 AM CDTAreal Flood AdvisoryLSXMadison, Monroe, Saint Clair3 hr
Apr 19, 6:22 AM CDTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair38 min
Apr 19, 6:26 AM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair49 min
Apr 19, 6:56 AM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair49 min
Apr 19, 7:08 AM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison, Montgomery37 min
Apr 19, 7:36 AM CDTSevere Thunderstorm WarningLSXBond, Macoupin, Madison, Montgomery39 min
Apr 19, 8:07 AM CDTSevere Thunderstorm WarningLSXBond, Fayette, Montgomery38 min
Apr 19, 8:25 AM CDTSevere Thunderstorm WarningLSXFayette, Marion29 min
Apr 19, 8:41 AM CDTSevere Thunderstorm WarningLSXFayette34 min
Apr 19, 11:18 AM CDTRiver Flood WarningLSXCalhoun, Greene, Jersey85 days
Apr 19, 3:46 PM CDTSevere Thunderstorm WarningLSXPike44 min
Apr 19, 3:59 PM CDTTornado WarningLSXPike46 min
Apr 19, 4:18 PM CDTTornado WarningLSXCalhoun, Greene, Pike42 min
Apr 19, 4:31 PM CDTTornado WarningLSXCalhoun44 min
Apr 19, 4:41 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey, Macoupin, Madison49 min
Apr 19, 4:59 PM CDTTornado WarningLSXGreene, Pike46 min
Apr 19, 5:28 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin47 min
Apr 19, 5:28 PM CDTSevere Thunderstorm WarningLSXCalhoun47 min
Apr 19, 5:36 PM CDTTornado WarningLSXMacoupin39 min
Apr 19, 5:42 PM CDTSevere Thunderstorm WarningLSXGreene34 min
Apr 19, 5:44 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey34 min
Apr 19, 6:01 PM CDTTornado WarningLSXMontgomery44 min
Apr 19, 6:05 PM CDTTornado WarningLSXMacoupin, Montgomery40 min
Apr 19, 6:12 PM CDTSevere Thunderstorm WarningLSXCalhoun48 min
Apr 19, 6:14 PM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison61 min
Apr 19, 6:31 PM CDTTornado WarningLSXMontgomery27 min
Apr 19, 6:56 PM CDTSevere Thunderstorm WarningLSXBond, Macoupin, Madison, Montgomery64 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.