Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 31, NWS St. Louis, MO

April 9, 2011Calhoun County, Pike County, Illinois; Pike County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 3:44 AM CDT for Calhoun County, Pike County, Illinois; Pike County, Missouri. 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 9, 2011, 3:44 AM CDT (08:44 UTC)
Expired: Apr 9, 2011, 4:15 AM CDT
In force: 31 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Calhoun County, IL, Pike County, IL, Pike County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 08:44 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 8.7 hours before the alert went out and 206 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: 637 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 242 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.

207 
WUUS53 KLSX 090844
SVRLSX
ILC013-149-MOC163-090915-
/O.NEW.KLSX.SV.W.0031.110409T0844Z-110409T0915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
344 AM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
  EAST CENTRAL PIKE COUNTY IN NORTHEAST MISSOURI...

* UNTIL 415 AM CDT

* AT 339 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR CLARKSVILLE...OR 12 MILES SOUTHEAST OF
  LOUISIANA...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BELLEVIEW...MOZIER...NEBO...KAMPSVILLE...BEECREEK AND PEARL.

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 3944 9062 3926 9062 3922 9096 3923 9099
      3939 9105 3950 9061
TIME...MOT...LOC 0844Z 254DEG 20KT 3934 9086
WIND...HAIL <50MPH 1.00IN

$$

TILLY

1 follow-up statement

530 
WWUS53 KLSX 090912
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
412 AM CDT SAT APR 9 2011

ILC013-149-MOC163-090922-
/O.EXP.KLSX.SV.W.0031.000000T0000Z-110409T0915Z/
CALHOUN IL-PIKE IL-PIKE MO-
412 AM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR CALHOUN COUNTY IN SOUTHWEST
ILLINOIS...AND SOUTHEASTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
AND EAST CENTRAL PIKE COUNTY IN NORTHEAST MISSOURI WILL EXPIRE AT 415
AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 3944 9062 3926 9062 3922 9096 3923 9099
      3939 9105 3950 9061
TIME...MOT...LOC 0912Z 246DEG 21KT 3938 9069

$$

TILLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:46 AM CDT	Flash Flood Warning	LSX	Adams	6 hr
Apr 9, 3:00 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	33 min
Apr 9, 4:19 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	26 min
Apr 9, 5:08 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Madison	22 min
Apr 9, 5:21 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	39 min
Apr 9, 5:25 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	35 min
Apr 9, 5:41 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	49 min
Apr 9, 5:44 AM CDT	Areal Flood Advisory	LSX	Calhoun, Jersey, Macoupin, Madison	3 hr
Apr 9, 6:43 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	32 min
Apr 9, 10:42 AM CDT	River Flood Warning	LSX	Adams	32 days
Apr 9, 1:42 AM CDT	Flash Flood Warning	LSX	Marion, Shelby	6 hr
Apr 9, 5:04 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois	41 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.