Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 7, NWS St. Louis, MO

February 28, 2017Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 4:15 PM CST for Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Missouri. It was in force for 32 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, 2017, 4:15 PM CST (22:15 UTC)
Expired: Feb 28, 2017, 4:47 PM CST
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Lincoln County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 22:16 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, 4:19 PM CST	HAIL 0.7	Hardin, 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
Feb 28, 2:19 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 188 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: 569 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

152 
WUUS53 KLSX 282215
SVRLSX
ILC013-061-083-MOC113-282300-
/O.NEW.KLSX.SV.W.0007.170228T2215Z-170228T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
415 PM CST TUE FEB 28 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  North central Calhoun County in southwestern Illinois...
  Greene County in southwestern Illinois...
  Northwestern Jersey County in southwestern Illinois...
  Northeastern Lincoln County in east central Missouri...

* Until 500 PM CST.

* At 414 PM CST, a severe thunderstorm was located near Hardin,
  moving northeast at 70 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Trained weather spotters.  Quarter size hail was reported 
           in Elsberry at 410 pm.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  White Hall, Elsberry, Carrollton, Greenfield, Hardin, Athensville,
  Belleview, Kampsville, Wrights, Eldred, Rockbridge, Hamburg,
  Belltown, Mozier, Berdan, Haypress, Walkersville, Woody and
  Michael.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 900 PM CST for southwestern
Illinois...and east central Missouri. A tornado watch also remains in
effect until 1000 PM CST for west central Illinois...and northeastern
Missouri.

LAT...LON 3952 9015 3926 9015 3908 9073 3922 9082
      3922 9072 3925 9073 3934 9084 3940 9064
      3939 9062 3941 9061 3952 9020
TIME...MOT...LOC 2214Z 245DEG 62KT 3922 9061 

HAIL...1.00IN
WIND...60MPH
 
$$

Britt

2 follow-up statements

540 
WWUS53 KLSX 282230
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
430 PM CST TUE FEB 28 2017

ILC013-083-MOC113-282239-
/O.CAN.KLSX.SV.W.0007.000000T0000Z-170228T2300Z/
Calhoun IL-Jersey IL-Lincoln MO-
430 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CALHOUN...
NORTHWESTERN JERSEY AND NORTHEASTERN LINCOLN COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 900 PM CST for southwestern
Illinois and eastern Missouri.    

LAT...LON 3952 9015 3926 9015 3926 9019 3924 9020
      3922 9027 3922 9031 3921 9031 3917 9043
      3918 9048 3916 9050 3918 9050 3919 9052
      3928 9057 3943 9052 3952 9020
TIME...MOT...LOC 2229Z 249DEG 57KT 3930 9032 

$$

ILC061-282300-
/O.CON.KLSX.SV.W.0007.000000T0000Z-170228T2300Z/
Greene IL-
430 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR GREENE COUNTY...

At 429 PM CST, a severe thunderstorm was located near Carrollton,
moving east at 65 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Trained weather spotters. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
White Hall, Carrollton, Greenfield, Athensville, Kane, Wrights,
Eldred, Rockbridge, Belltown, Berdan, Haypress, Walkersville and
Woody.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 900 PM CST for southwestern
Illinois.

LAT...LON 3952 9015 3926 9015 3926 9019 3924 9020
      3922 9027 3922 9031 3921 9031 3917 9043
      3918 9048 3916 9050 3918 9050 3919 9052
      3928 9057 3943 9052 3952 9020
TIME...MOT...LOC 2229Z 249DEG 57KT 3930 9032 

HAIL...1.00IN
WIND...60MPH
 
$$

Britt

597 
WWUS53 KLSX 282247
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
447 PM CST TUE FEB 28 2017

ILC061-282257-
/O.CAN.KLSX.SV.W.0007.000000T0000Z-170228T2300Z/
Greene IL-
447 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR GREENE COUNTY IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A tornado watch remains in effect until 900 PM CST for southwestern
Illinois.

LAT...LON 3952 9015 3926 9015 3926 9019 3924 9020
      3922 9027 3922 9031 3921 9031 3917 9043
      3918 9048 3916 9050 3918 9050 3919 9052
      3928 9057 3943 9052 3952 9020
TIME...MOT...LOC 2246Z 245DEG 62KT 3943 8995 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 2:37 AM CST	Severe Thunderstorm Warning	LSX	Randolph	16 min
Feb 28, 12:50 PM CST	Wind Advisory	LSX	Adams, Brown, Pike	5 hr
Feb 28, 4:07 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph	26 min
Feb 28, 5:10 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	33 min
Feb 28, 5:14 PM CST	Tornado Warning	LSX	Macoupin, Montgomery	31 min
Feb 28, 5:29 PM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	46 min
Feb 28, 5:36 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair	39 min
Feb 28, 2:32 PM CST	Severe Thunderstorm Warning	LSX	Crawford	43 min
Feb 28, 3:02 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	43 min
Feb 28, 3:38 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	52 min
Feb 28, 4:01 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	44 min
Feb 28, 4:41 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Washington	34 min
Feb 28, 4:58 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	33 min
Feb 28, 5:16 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Washington	44 min
Feb 28, 5:44 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	31 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Severe Thunderstorm Warnings in Missouri, 2017 Every severe thunderstorm warning in 2017

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.