Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 64, NWS St. Louis, MO

May 26, 2018Lewis County, Missouri; Adams County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 26, 2018, 5:45 PM CDT for Lewis County, Missouri; Adams County, Illinois. It was in force for 45 min. 1 report 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, 5:45 PM CDT (22:45 UTC)
Expired: May 26, 2018, 6:30 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adams County, IL, Lewis County, MO

The radar

The St Louis radar (KLSX), 178 km from the middle of the area, began a volume at 22:48 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, 6:40 PM CDT	HAIL 1	5 N Monticello, MO

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, 10.8 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: 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.

184 
WUUS53 KLSX 262245
SVRLSX
ILC001-MOC111-262330-
/O.NEW.KLSX.SV.W.0064.180526T2245Z-180526T2330Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Adams County in west central Illinois...
  Central Lewis County in northeastern Missouri...

* Until 630 PM CDT.

* At 544 PM CDT, a severe thunderstorm was located near Canton,
  moving southeast at 10 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...
  Canton, Mendon, La Grange, Ursa, Lima, Monticello and Meyer. 

This also includes  Wakonda State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4025 9150 4020 9150 4020 9130 4001 9129
      4000 9162 4026 9185
TIME...MOT...LOC 2244Z 320DEG 7KT 4016 9148 

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

Kanofsky

1 follow-up statement

348 
WWUS53 KLSX 262326
SVSLSX

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

ILC001-MOC111-262336-
/O.EXP.KLSX.SV.W.0064.000000T0000Z-180526T2330Z/
Adams IL-Lewis MO-
626 PM CDT SAT MAY 26 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ADAMS AND CENTRAL
LEWIS COUNTIES WILL EXPIRE AT 630 PM CDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4025 9150 4020 9150 4020 9130 4001 9129
      4000 9162 4026 9185
TIME...MOT...LOC 2326Z 320DEG 7KT 4010 9142 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 5:40 PM CDT	Special Weather Statement	LSX	Lewis	65 min
May 26, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	40 min
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, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	62 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

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