Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 76, NWS St. Louis, MO

May 27, 2018Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2018, 6:11 PM CDT for Saint Charles County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 40 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 27, 2018, 6:11 PM CDT (23:11 UTC)
Expired: May 27, 2018, 6:51 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 23:12 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 212 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: 2208 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

529 
WUUS53 KLSX 272311
SVRLSX
ILC119-163-MOC183-189-510-280030-
/O.NEW.KLSX.SV.W.0076.180527T2311Z-180528T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
611 PM CDT SUN MAY 27 2018

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Western Madison County in southwestern Illinois...
  Northwestern St. Clair County in southwestern Illinois...
  St. Louis City in east central Missouri...
  Northeastern St. Charles County in east central Missouri...
  Northeastern St. Louis County in east central Missouri...

* Until 730 PM CDT.

* At 610 PM CDT, severe thunderstorms were located along a line
  extending from near Rosewood Heights to near Mascoutah, moving
  southwest at 15 mph.

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

  SOURCE...Trained weather spotters. A 68 mph wind gust was reported 
           at Alton regional airport. 

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

* Locations impacted include...
  St. Louis, Florissant, Belleville, University City, Granite City,
  O'Fallon, Alton, East St. Louis, Hazelwood, Collinsville, Ferguson,
  Godfrey, Fairview Heights, Cahokia, Jennings, Swansea, Shiloh,
  Bellefontaine Neighbors, Wood River and Berkeley.

This includes Interstate 64 in Illinois between exits 9 and 12.
 
This also includes  Scott Joplin Historic Site, Confluence State
Park, and Horseshoe Lake State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3836 9008 3845 9018 3890 9047 3893 9032
      3892 9028 3894 9027 3896 9017 3847 8988
TIME...MOT...LOC 2310Z 059DEG 13KT 3893 9010 3852 8976 

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

Kanofsky

1 follow-up statement

118 
WWUS53 KLSX 272351
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
651 PM CDT SUN MAY 27 2018

ILC119-163-MOC183-189-510-280000-
/O.CAN.KLSX.SV.W.0076.000000T0000Z-180528T0030Z/
Madison IL-St. Clair IL-St. Louis City MO-St. Charles MO-
St. Louis MO-
651 PM CDT SUN MAY 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN MADISON AND
NORTHWESTERN ST. CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...
NORTHEASTERN ST. CHARLES AND NORTHEASTERN ST. LOUIS COUNTIES IN EAST
CENTRAL MISSOURI AND ST. LOUIS CITY IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3836 9008 3845 9018 3890 9047 3893 9032
      3892 9028 3894 9027 3896 9017 3847 8988
TIME...MOT...LOC 2350Z 059DEG 13KT 3885 9026 3844 8992 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 7:18 PM CDT	Special Weather Statement	LSX	Marion	27 min
May 26, 7:48 PM CDT	Special Weather Statement	LSX	Marion	27 min
May 26, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	46 min
May 27, 1:23 AM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis	94 min
May 27, 1:45 AM CDT	Special Weather Statement	LSX	City of Saint Louis	45 min
May 27, 1:58 AM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	34 min
May 27, 3:21 PM CDT	Special Weather Statement	LSX	City of Saint Louis	24 min
May 27, 3:28 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	32 min
May 27, 3:54 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr
May 27, 4:53 PM CDT	Special Weather Statement	LSX	Iron	37 min
May 27, 5:01 PM CDT	Special Weather Statement	LSX	Pike	44 min
May 27, 5:14 PM CDT	Special Weather Statement	LSX	Montgomery, Warren	46 min
May 27, 5:22 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery, Warren	53 min
May 27, 5:38 PM CDT	Special Weather Statement	LSX	Lewis	52 min
May 27, 5:45 PM CDT	Special Weather Statement	LSX	Ralls	45 min
May 27, 5:46 PM CDT	Severe Thunderstorm Warning	LSX	Knox	29 min
May 27, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Ralls	25 min
May 27, 6:12 PM CDT	Special Weather Statement	LSX	Knox	33 min
May 27, 6:15 PM CDT	Special Weather Statement	LSX	Monroe	45 min
May 26, 7:35 PM CDT	Special Weather Statement	LSX	Pike	25 min
May 26, 11:16 PM CDT	Special Weather Statement	LSX	Jersey	44 min
May 27, 12:41 AM CDT	Special Weather Statement	LSX	Madison	49 min
May 27, 2:40 PM CDT	Special Weather Statement	LSX	Montgomery	35 min
May 27, 3:06 PM CDT	Special Weather Statement	LSX	Montgomery	24 min
May 27, 3:33 PM CDT	Special Weather Statement	LSX	Macoupin	42 min
May 27, 3:35 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	40 min
May 27, 3:39 PM CDT	Special Weather Statement	LSX	Pike	51 min
May 27, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	29 min
May 27, 4:27 PM CDT	Areal Flood Advisory	LSX	Adams	3 hr
May 27, 5:46 PM CDT	Severe Thunderstorm Warning	LSX	Madison	59 min
May 27, 5:57 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	48 min
May 27, 6:26 PM CDT	Areal Flood Advisory	LSX	Madison, Saint Clair	3 hr
May 27, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	69 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2018 Severe Thunderstorm Warnings in Illinois, 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.