Alert archive / Illinois / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 63, NWS St. Louis, MO

May 26, 2018Adams County, Brown County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 26, 2018, 5:28 PM CDT for Adams County, Brown County, Pike County, Illinois. It was in force for 62 min. 2 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: May 26, 2018, 5:28 PM CDT (22:28 UTC)
Expired: May 26, 2018, 6:30 PM CDT
In force: 62 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adams County, IL, Brown County, IL, Pike County, IL

The radar

The Lincoln radar (KILX), 122 km from the middle of the area, began a volume at 22:28 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
May 26, 5:32 PM CDT	TSTM WND GST 30	1 Sw Clayton, IL
May 26, 5:42 PM CDT	HAIL 0.75	1 Wsw Camp Point, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 179 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: 2099 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

164 
WUUS53 KLSX 262228
SVRLSX
ILC001-009-149-262330-
/O.NEW.KLSX.SV.W.0063.180526T2228Z-180526T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
528 PM CDT SAT MAY 26 2018

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northeastern Pike County in west central Illinois...
  Adams County in west central Illinois...
  Brown County in west central Illinois...

* Until 630 PM CDT.

* At 527 PM CDT, severe thunderstorms were located along a line
  extending from near Mendon to near Mount Sterling, moving southeast
  at 30 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...
  Quincy Regional Airport, Mount Sterling, Camp Point, Payson,
  Mendon, Clayton, Golden, Beverly, Buckhorn, Adams, Kingston,
  Burton, Liberty, Versailles, Richfield, Perry, Loraine, Plainville,
  Woodville and Chambersburg.

This also includes  Siloam Springs State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4019 9091 4011 9091 4010 9070 4009 9070
      4008 9067 4005 9068 4002 9063 4003 9061
      4001 9062 4000 9060 3998 9061 3998 9058
      3980 9059 3975 9062 3976 9127 4019 9131
TIME...MOT...LOC 2227Z 334DEG 26KT 4005 9126 4005 9076 

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

Kanofsky

1 follow-up statement

405 
WWUS53 KLSX 262326 RRA
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
626 PM CDT SAT MAY 26 2018

ILC001-009-149-262336-
/O.EXP.KLSX.SV.W.0063.000000T0000Z-180526T2330Z/
Pike IL-Adams IL-Brown IL-
626 PM CDT SAT MAY 26 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIKE...ADAMS AND
BROWN COUNTIES IN WEST CENTRAL ILLINOIS WILL EXPIRE AT 630 PM CDT...
            
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 will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with these
thunderstorms.

LAT...LON 4019 9091 4011 9091 4010 9070 4009 9070
      4008 9067 4005 9068 4002 9063 4003 9061
      4001 9062 4000 9060 3998 9061 3998 9058
      3980 9059 3975 9062 3976 9127 4019 9131
TIME...MOT...LOC 2326Z 334DEG 26KT 3969 9103 3969 9053 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Brown	66 min
May 26, 4:58 PM CDT	Severe Thunderstorm Warning	LSX	Adams	32 min
May 26, 5:45 PM CDT	Severe Thunderstorm Warning	LSX	Adams	45 min
May 26, 6:45 PM CDT	Special Weather Statement	LSX	Adams	30 min
May 26, 6:46 PM CDT	Special Weather Statement	LSX	Pike	29 min
May 26, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Adams	40 min

Nearby

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.