Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 89, NWS St. Louis, MO

May 31, 2018Iron County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 31, 2018, 7:57 PM CDT for Iron County, Washington County, Missouri. It was in force for 12 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: May 31, 2018, 7:57 PM CDT (00:57 UTC)
Expired: May 31, 2018, 8:09 PM CDT
In force: 12 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Iron County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 106 km from the middle of the area, began a volume at 01:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 31, 1:57 PM CDT	Tornado Watch	SPC	6 hr
May 31, 7:56 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.0 hours before the alert went out and 279 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: 2032 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

As transmitted.

327 
WUUS53 KLSX 010057
SVRLSX
MOC093-221-010145-
/O.NEW.KLSX.SV.W.0089.180601T0057Z-180601T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
757 PM CDT THU MAY 31 2018

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  North central Iron County in southeastern Missouri...
  Southern Washington County in east central Missouri...

* Until 845 PM CDT.

* At 756 PM CDT, a severe thunderstorm was located 9 miles northwest
  of Belleview, moving east at 25 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...
  Potosi, Irondale, Mineral Point, Belleview, Caledonia and Belgrade.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3763 9095 3787 9106 3795 9072 3779 9064
      3767 9065
TIME...MOT...LOC 0056Z 256DEG 22KT 3777 9088 

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

Kanofsky

1 follow-up statement

204 
WWUS53 KLSX 010109
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
809 PM CDT THU MAY 31 2018

MOC093-221-010119-
/O.CAN.KLSX.SV.W.0089.000000T0000Z-180601T0145Z/
Iron MO-Washington MO-
809 PM CDT THU MAY 31 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL IRON AND
SOUTHERN WASHINGTON COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
southeastern and east central Missouri.

LAT...LON 3763 9095 3787 9106 3795 9072 3779 9064
      3767 9065
TIME...MOT...LOC 0107Z 256DEG 22KT 3779 9078 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Washington	57 min
May 31, 7:28 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	32 min
May 31, 7:33 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois, Washington	35 min
May 31, 8:14 PM CDT	Severe Thunderstorm Warning	LSX	Reynolds	50 min
May 31, 9:26 PM CDT	Special Weather Statement	LSX	Reynolds	49 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2018 Every severe thunderstorm warning in 2018

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.