Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 13, NWS St. Louis, MO

February 28, 2017Monroe County, Randolph County, Saint Clair County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 5:36 PM CST for Monroe County, Randolph County, Saint Clair County, Illinois; Jefferson County, Missouri. It was in force for 39 min. 10 reports 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, 5:36 PM CST (23:36 UTC)
Expired: Feb 28, 2017, 6:15 PM CST
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 23:39 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, 5:36 PM CST	HAIL 0.88	Valmeyer, IL
Feb 28, 5:38 PM CST	HAIL 1	Maeystown, IL
Feb 28, 5:55 PM CST	HAIL 1.5	6 Ssw Chalfin Bridge, MO	DELAYED REPORT. PHOTO OF HAIL LARGER THAN A GOLF BALL OCCURRED AT US 61 AND STATE ROAD AA.
Feb 28, 5:56 PM CST	HAIL 1	Fults, IL
Feb 28, 6:00 PM CST	HAIL 1.5	Hecker, IL
Feb 28, 6:00 PM CST	HAIL 1.75	Hecker, IL
Feb 28, 6:11 PM CST	HAIL 1.5	New Athens, IL
Feb 28, 6:13 PM CST	HAIL 1.5	Red Bud, IL
Feb 28, 6:25 PM CST	HAIL 0.88	Waterloo, IL
Feb 28, 6:25 PM CST	HAIL 1.75	1 S Red Bud, 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, 11.6 hours before the alert went out and 249 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.

292 
WUUS53 KLSX 282336
SVRLSX
ILC133-157-163-MOC099-010015-
/O.NEW.KLSX.SV.W.0013.170228T2336Z-170301T0015Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Monroe County in southwestern Illinois...
  North central Randolph County in southwestern Illinois...
  Southeastern St. Clair County in southwestern Illinois...
  East central Jefferson County in east central Missouri...

* Until 615 PM CST.

* At 536 PM CST, a severe thunderstorm was located near Crystal City,
  moving east at 55 mph.

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

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Festus, Waterloo, Mascoutah, Pevely, Crystal City, Freeburg, Red
  Bud, Herculaneum, Smithton, New Athens, Marissa, Valmeyer, Baldwin,
  New Design, St. Libory, Prairie, Lenzburg, Hecker, Fayetteville and
  Maeystown.

This includes Interstate 55 in Missouri near exit 178.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 south central
and southwestern Illinois...and southeastern and east central
Missouri.

LAT...LON 3817 8988 3814 9004 3809 9020 3813 9025
      3809 9029 3809 9031 3826 9043 3851 8978
      3839 8970 3822 8970
TIME...MOT...LOC 2336Z 251DEG 47KT 3821 9026 

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

Kanofsky

1 follow-up statement

916 
WWUS53 KLSX 282357
SVSLSX

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

ILC133-157-163-MOC099-010015-
/O.CON.KLSX.SV.W.0013.000000T0000Z-170301T0015Z/
Monroe IL-Randolph IL-St. Clair IL-Jefferson MO-
557 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CST
FOR MONROE...NORTH CENTRAL RANDOLPH...SOUTHEASTERN ST. CLAIR AND EAST
CENTRAL JEFFERSON COUNTIES...

At 556 PM CST, a severe thunderstorm was located near New Athens,
moving east at 60 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...
Festus, Waterloo, Mascoutah, Pevely, Crystal City, Freeburg, Red Bud,
Herculaneum, Smithton, New Athens, Marissa, Valmeyer, Baldwin, New
Design, St. Libory, Prairie, Lenzburg, Hecker, Fayetteville and
Maeystown.

This includes Interstate 55 in Missouri near exit 178.
 
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 south central
and southwestern Illinois...and southeastern and east central
Missouri.

LAT...LON 3817 8988 3814 9004 3809 9020 3813 9025
      3809 9029 3809 9031 3826 9043 3851 8978
      3839 8970 3822 8970
TIME...MOT...LOC 2356Z 247DEG 52KT 3831 8998 

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

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, 4:15 PM CST	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	32 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, 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.