Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 71, NWS St. Louis, MO

May 27, 2018Montgomery County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2018, 5:22 PM CDT for Montgomery County, Warren County, Missouri. It was in force for 53 min. 3 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, 5:22 PM CDT (22:22 UTC)
Expired: May 27, 2018, 6:15 PM CDT
In force: 53 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Montgomery County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 22:24 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.

What was reported inside it

Time	Report	Where	Remark
May 27, 5:29 PM CDT	HAIL 1	2 Se New Florence, MO
May 27, 5:30 PM CDT	HAIL 0.88	1 Ssw New Florence, MO	SPOTTER WAS EXITING FROM I-70 AND ESTIMATED HAIL TO BE NICKEL SIZE. WINDS WERE ESTIMATE TO BE NEAR 60 MPH AT THE TIME OF OBSERVATION.
May 27, 5:31 PM CDT	HAIL 1	2 Wsw New Florence, MO	EMPLOYEE TRAVELING ALONG I-70 REPORTED 1.00 HAIL AT MILE MARKER 174.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.4 hours before the alert went out and 284 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.

937 
WUUS53 KLSX 272222
SVRLSX
MOC139-219-272315-
/O.NEW.KLSX.SV.W.0071.180527T2222Z-180527T2315Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Central Montgomery County in east central Missouri...
  West central Warren County in east central Missouri...

* Until 615 PM CDT.

* At 522 PM CDT, a severe thunderstorm was located over New Florence,
  and is nearly stationary.

  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...
  Montgomery City, New Florence, Jonesburg, Bellflower, Mineola, Big
  Spring, High Hill and Danville.

This includes Interstate 70 in Missouri between exits 170 and 183.
 
This also includes  Graham Cave State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3876 9155 3896 9160 3902 9130 3878 9124
TIME...MOT...LOC 2222Z 258DEG 4KT 3889 9141 

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

Kanofsky

2 follow-up statements

287 
WWUS53 KLSX 272230
SVSLSX

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

MOC139-219-272315-
/O.CON.KLSX.SV.W.0071.000000T0000Z-180527T2315Z/
Montgomery MO-Warren MO-
530 PM CDT SUN MAY 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR CENTRAL MONTGOMERY AND WEST CENTRAL WARREN COUNTIES...

At 530 PM CDT, a severe thunderstorm was located over New Florence,
and is nearly stationary.

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

SOURCE...Trained weather spotters reported quarter size hail 
         located 2 miles southeast of New Florence.

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

Locations impacted include...
Montgomery City, New Florence, Jonesburg, Bellflower, Mineola, Big
Spring, High Hill and Danville.

This also includes  Graham Cave State Park.
 
This includes Interstate 70 in Missouri between exits 170 and 183.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3876 9155 3896 9160 3902 9130 3878 9124
TIME...MOT...LOC 2230Z 258DEG 4KT 3889 9140 

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

Kanofsky

417 
WWUS53 KLSX 272308
SVSLSX

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

MOC139-219-272318-
/O.EXP.KLSX.SV.W.0071.000000T0000Z-180527T2315Z/
Montgomery MO-Warren MO-
608 PM CDT SUN MAY 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY AND WEST
CENTRAL WARREN COUNTIES 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.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3876 9155 3896 9160 3902 9130 3878 9124
TIME...MOT...LOC 2308Z 258DEG 4KT 3890 9135 

$$

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, 5:38 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, 6:11 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.