Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 12, NWS St. Louis, MO

February 28, 2011Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2011, 12:23 AM CST for Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 52 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: Feb 28, 2011, 12:23 AM CST (06:23 UTC)
Expired: Feb 28, 2011, 1:15 AM CST
In force: 52 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Randolph County, IL, Saint Francois County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 06:23 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
Feb 28, 12:30 AM CST	TSTM WND DMG	4 Se Walsh, IL	A TREE WAS BLOWN DOWN ONTO ZION CHURCH ROAD SOUTHEAST OF WALSH.

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
Feb 27, 9:40 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 6.4 hours before the alert went out and 282 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: 124 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

718 
WUUS53 KLSX 280623
SVRLSX
ILC157-MOC186-187-280715-
/O.NEW.KLSX.SV.W.0012.110228T0623Z-110228T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1223 AM CST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
  STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
  ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...

* UNTIL 115 AM CST

* AT 1218 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM COULTERVILLE TO 7 MILES WEST OF WEINGARTEN...AND MOVING
  SOUTHEAST AT 50 MPH. NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  CHESTER...STEELEVILLE...BREMEN...PERCY...COFFMAN...ST. MARY...NEW
  PALESTINE...RIVER AUX VASES...KASKASKIA...WELGE...MINNITH AND
  ROCKWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3793 9058 3821 8961 3795 8960 3783 8967
      3782 8972 3785 8975 3790 8986 3787 8990
      3788 8993 3783 9000 3771 9008 3769 9014
      3770 9016 3768 9021
TIME...MOT...LOC 0623Z 315DEG 19KT 3812 8957 3783 9031
WIND...HAIL 60MPH 0.88IN

$$

GKS

2 follow-up statements

931 
WWUS53 KLSX 280653
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1253 AM CST MON FEB 28 2011

ILC157-MOC186-187-280715-
/O.CON.KLSX.SV.W.0012.000000T0000Z-110228T0715Z/
RANDOLPH IL-ST. FRANCOIS MO-STE. GENEVIEVE MO-
1253 AM CST MON FEB 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR STE.
GENEVIEVE...ST. FRANCOIS AND RANDOLPH COUNTIES UNTIL 115 AM CST...

AT 1248 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
BROKEN LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING 
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM PERCY TO ST. MARY TO FARMINGTON...MOVING SOUTHEAST AT
35 MPH. NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  CHESTER...BREMEN...PERCY...COFFMAN...ST. MARY...WELGE...MINNITH AND
  ROCKWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3793 9058 3821 8961 3795 8960 3783 8967
      3782 8972 3785 8975 3790 8986 3787 8990
      3788 8993 3783 9000 3771 9008 3769 9014
      3770 9016 3768 9021
TIME...MOT...LOC 0653Z 348DEG 11KT 3804 8959 3788 9000
          3775 9034
WIND...HAIL 60MPH 0.88IN

$$

GKS

476 
WWUS53 KLSX 280717
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
117 AM CST MON FEB 28 2011

ILC157-MOC186-187-280727-
/O.EXP.KLSX.SV.W.0012.000000T0000Z-110228T0715Z/
RANDOLPH IL-ST. FRANCOIS MO-STE. GENEVIEVE MO-
117 AM CST MON FEB 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR STE. GENEVIEVE...ST. FRANCOIS
AND RANDOLPH COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING WERE MOVING OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 400 AM.

LAT...LON 3793 9058 3821 8961 3795 8960 3783 8967
      3782 8972 3785 8975 3790 8986 3787 8990
      3788 8993 3783 9000 3771 9008 3769 9014
      3770 9016 3768 9021
TIME...MOT...LOC 0653Z 348DEG 11KT 3804 8959 3788 9000
          3775 9034

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 6:26 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	49 min
Feb 27, 7:38 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	37 min
Feb 27, 8:02 PM CST	Tornado Warning	LSX	Pike	28 min
Feb 27, 8:14 PM CST	Severe Thunderstorm Warning	LSX	Brown	16 min
Feb 27, 8:25 PM CST	Severe Thunderstorm Warning	LSX	Calhoun, Pike	35 min
Feb 27, 9:50 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	40 min
Feb 27, 10:30 PM CST	Severe Thunderstorm Warning	LSX	Pike	18 min
Feb 27, 10:47 PM CST	Tornado Warning	LSX	Monroe, Saint Clair	43 min
Feb 27, 11:18 PM CST	Tornado Warning	LSX	Madison, Monroe, Saint Clair	42 min
Feb 27, 11:43 PM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Madison, Saint Clair, Washington	47 min
Feb 28, 12:07 AM CST	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion, Washington	38 min
Feb 28, 2:19 AM CST	River Flood Warning	LSX	Jersey	4 days
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Pike	29 hr
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Pike	38 hr
Feb 28, 6:46 AM CST	River Flood Warning	LSX	Calhoun	52 hr
Feb 28, 11:14 AM CST	River Flood Warning	LSX	Morgan, Pike	17 days
Feb 28, 11:43 AM CST	River Flood Warning	LSX	Calhoun	47 hr
Feb 27, 6:57 PM CST	Severe Thunderstorm Warning	LSX	Lewis, Marion	15 min
Feb 27, 8:13 PM CST	Areal Flood Advisory	LSX	Marion	4 hr
Feb 27, 9:54 PM CST	Tornado Warning	LSX	Cole, Gasconade, Osage	36 min
Feb 27, 10:19 PM CST	Tornado Warning	LSX	Franklin, Gasconade, Warren	41 min
Feb 27, 10:25 PM CST	Tornado Warning	LSX	Franklin, Gasconade	50 min
Feb 27, 11:05 PM CST	River Flood Warning	LSX	Marion	35 hr
Feb 27, 11:11 PM CST	River Flood Warning	LSX	Lincoln	35 hr
Feb 27, 11:11 PM CST	River Flood Warning	LSX	Marion	35 hr
Feb 27, 11:11 PM CST	River Flood Warning	LSX	Monroe	4 days
Feb 27, 11:47 PM CST	Severe Thunderstorm Warning	LSX	Crawford	21 min
Feb 28, 12:06 AM CST	Severe Thunderstorm Warning	LSX	Washington	39 min
Feb 28, 12:18 AM CST	Tornado Warning	LSX	Iron, Reynolds	42 min
Feb 28, 12:44 AM CST	Tornado Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	46 min
Feb 28, 10:38 AM CST	River Flood Warning	LSX	Gasconade, Montgomery	4 days

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 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.