Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 67, NWS St. Louis, MO

April 26, 2017Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 26, 2017, 3:24 PM CDT for Marion County, Illinois. It was in force for 25 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: Apr 26, 2017, 3:24 PM CDT (20:24 UTC)
Expired: Apr 26, 2017, 3:49 PM CDT
In force: 25 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Marion County, IL

The radar

The Evansville,IN radar (KVWX), 101 km from the middle of the area, began a volume at 20:24 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
Apr 26, 12:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 182 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: 1086 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

427 
WUUS53 KLSX 262024
SVRLSX
ILC121-262100-
/O.NEW.KLSX.SV.W.0067.170426T2024Z-170426T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
324 PM CDT WED APR 26 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Marion County in south central Illinois...

* Until 400 PM CDT.

* At 323 PM CDT, a severe thunderstorm was located 7 miles north of
  Mount Vernon, moving northeast at 60 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...
  Helm and Kell. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3848 8896 3866 8870 3847 8870
TIME...MOT...LOC 2023Z 231DEG 50KT 3842 8888 

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

Carney

1 follow-up statement

272 
WWUS53 KLSX 262049
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
349 PM CDT WED APR 26 2017

ILC121-262059-
/O.CAN.KLSX.SV.W.0067.000000T0000Z-170426T2100Z/
Marion IL-
349 PM CDT WED APR 26 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARION COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

A severe thunderstorm watch remains in effect until 700 PM CDT for
south central Illinois.

LAT...LON 3848 8896 3866 8870 3847 8870
TIME...MOT...LOC 2049Z 231DEG 50KT 3865 8851 

$$

Carney

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 9:49 PM CDT	River Flood Warning	LSX	Pike	46 days
Apr 26, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	46 min
Apr 26, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	51 min
Apr 26, 2:32 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	43 min
Apr 26, 3:15 PM CDT	Special Weather Statement	LSX	Marion	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.