Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 73, NWS St. Louis, MO

May 27, 2018Knox County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2018, 5:46 PM CDT for Knox County, Missouri. It was in force for 29 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 27, 2018, 5:46 PM CDT (22:46 UTC)
Expired: May 27, 2018, 6:15 PM CDT
In force: 29 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Knox County, MO

The radar

The St Louis radar (KLSX), 192 km from the middle of the area, began a volume at 22:45 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 27, 5:53 PM CDT	HAIL 1	Knox City, MO	TIME ESTIMATED FROM RADAR. FACEBOOK REPORT.
May 27, 5:54 PM CDT	HAIL 0.25	2 Ese Knox City, MO	SPOTTER REPORTED PEA SIZE HAIL FROM KNOX CITY TO THE LEWIS COUNTY LINE JUST WEST OF LABELLE.

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 215 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: 347 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 2291 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

678 
WUUS53 KLSX 272246 RRA
SVRLSX
MOC103-272315-
/O.NEW.KLSX.SV.W.0073.180527T2246Z-180527T2315Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Knox County in northeastern Missouri...

* Until 615 PM CDT.

* At 546 PM CDT, a severe thunderstorm was located over La Belle,
  moving southwest at 5 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...
  Knox City, Plevna and Newark. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in St Louis.

&&

LAT...LON 4017 9195 3995 9195 3995 9206 3998 9213
      4010 9222 4021 9200
TIME...MOT...LOC 2246Z 043DEG 6KT 4012 9197 

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

Gosselin

2 follow-up statements

566 
WWUS53 KLSX 272302
SVSLSX

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

MOC103-272315-
/O.CON.KLSX.SV.W.0073.000000T0000Z-180527T2315Z/
Knox MO-
602 PM CDT SUN MAY 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTHEASTERN KNOX COUNTY...

At 602 PM CDT, a severe thunderstorm was located over Knox City,
moving southwest 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...
Knox City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 4017 9195 4003 9195 4002 9203 4004 9214
      4010 9222 4017 9203
TIME...MOT...LOC 2302Z 054DEG 7KT 4010 9201 

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

Gosselin

462 
WWUS53 KLSX 272313
SVSLSX

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

MOC103-272323-
/O.EXP.KLSX.SV.W.0073.000000T0000Z-180527T2315Z/
Knox MO-
613 PM CDT SUN MAY 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KNOX COUNTY WILL
EXPIRE AT 615 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
St Louis.

LAT...LON 4017 9195 4003 9195 4002 9203 4004 9214
      4010 9222 4017 9203
TIME...MOT...LOC 2313Z 043DEG 6KT 4009 9203 

$$

Gosselin

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, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Ralls	25 min
May 27, 6:11 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	40 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

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