Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 86, NWS St. Louis, MO

April 19, 2011Fayette County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 8:41 AM CDT for Fayette County, Illinois. It was in force for 34 min. 1 report 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, 8:41 AM CDT (13:41 UTC)
Expired: Apr 19, 2011, 9:15 AM CDT
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Fayette County, IL

The radar

The Lincoln radar (KILX), 122 km from the middle of the area, began a volume at 13:44 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.

What was reported inside it

Time	Report	Where	Remark
Apr 19, 8:43 AM CDT	HAIL 0.25	1 S Ramsey, 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 12:00Z, 1.7 hours before the alert went out and 123 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: 453 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

553 
WUUS53 KLSX 191341
SVRLSX
ILC051-191415-
/O.NEW.KLSX.SV.W.0086.110419T1341Z-110419T1415Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 915 AM CDT

* AT 838 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR RAMSEY...OR 8 MILES NORTH OF VANDALIA...AND
  MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BROWNSTOWN...ST. ELMO...WRIGHTS CORNER AND AVENA.

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 3903 8881 3896 8900 3895 8925 3918 8925
      3922 8900 3921 8881
TIME...MOT...LOC 1341Z 256DEG 30KT 3910 8907
WIND...HAIL <50MPH 1.00IN

$$

BRITT

2 follow-up statements

351 
WWUS53 KLSX 191357
SVSLSX

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

ILC051-191415-
/O.CON.KLSX.SV.W.0086.000000T0000Z-110419T1415Z/
FAYETTE IL-
857 AM CDT TUE APR 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
FAYETTE COUNTY UNTIL 915 AM CDT...

AT 854 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR WRIGHTS CORNER...OR 17 MILES NORTHEAST OF
VANDALIA...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN FAYETTE COUNTY.

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.

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

&&

LAT...LON 3903 8881 3904 8901 3920 8910 3922 8900
      3921 8881
TIME...MOT...LOC 1357Z 249DEG 41KT 3917 8883
WIND...HAIL <50MPH 1.00IN

$$

BRITT

143 
WWUS53 KLSX 191409
SVSLSX

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

ILC051-191420-
/O.EXP.KLSX.SV.W.0086.000000T0000Z-110419T1415Z/
FAYETTE IL-
909 AM CDT TUE APR 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FAYETTE COUNTY
WILL EXPIRE AT 915 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

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

LAT...LON 3903 8881 3904 8901 3920 8910 3922 8900
      3921 8881
TIME...MOT...LOC 1410Z 249DEG 41KT 3922 8865

$$

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, 6:22 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	38 min
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, 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

Nearby

Severe Thunderstorm Warnings in Illinois, 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.