Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 97, NWS St. Louis, MO

May 27, 2017Sainte Genevieve County, Missouri; Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2017, 1:58 PM CDT for Sainte Genevieve County, Missouri; Randolph County, Illinois. It was in force for 51 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, 2017, 1:58 PM CDT (18:58 UTC)
Expired: May 27, 2017, 2:49 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Randolph County, IL, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 94 km from the middle of the area, began a volume at 18:59 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, 2:05 PM CDT	HAIL 0.25	Bloomsdale, MO
May 27, 2:49 PM CDT	TSTM WND DMG	Chester, IL	TREES AND POWER LINES DOWN.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 12:13 PM CDT	Tornado Watch	SPC	7 hr
May 27, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.0 hours before the alert went out and 273 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: 689 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

192 
WUUS53 KLSX 271858
SVRLSX
ILC157-MOC186-272000-
/O.NEW.KLSX.SV.W.0097.170527T1858Z-170527T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
158 PM CDT SAT MAY 27 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Central Randolph County in southwestern Illinois...
  Northern Ste. Genevieve County in southeastern Missouri...

* Until 300 PM CDT.

* At 158 PM CDT, a severe thunderstorm was located over Bloomsdale,
  moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Chester, Ste. Genevieve, Bremen, Evansville, Bloomsdale, St. Mary,
  Rocky Ridge, Weingarten, Preston, Prairie Du Rocher, Ellis Grove,
  Kaskaskia, Walsh, Kellogg, Roots, Modoc and New Palestine.

This includes Interstate 55 in Missouri between exits 143 and 162.
 
This also includes  Felix Valle House State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 700 PM CDT for southeastern
and east central Missouri.

LAT...LON 3790 8975 3790 8984 3791 8984 3787 8990
      3788 9036 3796 9035 3798 9032 3800 9035
      3808 9035 3809 9034 3810 9022 3809 9020
      3810 9017 3813 8974
TIME...MOT...LOC 1858Z 271DEG 28KT 3801 9025 

HAIL...<.75IN
WIND...60MPH
 
$$

Tilly

2 follow-up statements

868 
WWUS53 KLSX 271929
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
229 PM CDT SAT MAY 27 2017

ILC157-MOC186-272000-
/O.CON.KLSX.SV.W.0097.000000T0000Z-170527T2000Z/
Randolph IL-Ste. Genevieve MO-
229 PM CDT SAT MAY 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR CENTRAL RANDOLPH AND EAST CENTRAL STE. GENEVIEVE COUNTIES...

At 229 PM CDT, a severe thunderstorm was located near St. Mary,
moving east at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Chester, Ste. Genevieve, Bremen, Evansville, St. Mary, Preston, Ellis
Grove, Kaskaskia, Walsh, Kellogg, Roots, Modoc and New Palestine.

This also includes  Felix Valle House State Park.
 
This includes Interstate 55 in Missouri between exits 143 and 150.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 700 PM CDT for southeastern
Missouri.

LAT...LON 3790 8975 3790 8984 3791 8984 3787 8990
      3788 9019 3811 9004 3813 8974
TIME...MOT...LOC 1929Z 276DEG 34KT 3794 8992 

HAIL...<.75IN
WIND...60MPH
 
$$

Tilly

288 
WWUS53 KLSX 271949
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
249 PM CDT SAT MAY 27 2017

ILC157-MOC186-271958-
/O.CAN.KLSX.SV.W.0097.000000T0000Z-170527T2000Z/
Randolph IL-Ste. Genevieve MO-
249 PM CDT SAT MAY 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RANDOLPH AND EAST
CENTRAL STE. GENEVIEVE COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A tornado watch remains in effect until 700 PM CDT for southeastern
Missouri.

A severe thunderstorm watch remains in effect until 900 PM CDT for
southwestern Illinois.

LAT...LON 3790 8975 3790 8984 3791 8984 3787 8990
      3788 9019 3811 9004 3813 8974
TIME...MOT...LOC 1948Z 271DEG 28KT 3794 8972 

$$

Tilly

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 11:37 AM CDT	Special Weather Statement	LSX	Gasconade	38 min
May 27, 11:51 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	39 min
May 27, 12:31 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	44 min
May 27, 12:55 PM CDT	Tornado Warning	LSX	Crawford	11 min
May 27, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	46 min
May 27, 1:21 PM CDT	Tornado Warning	LSX	Cole, Osage	39 min
May 27, 1:33 PM CDT	Special Weather Statement	LSX	Sainte Genevieve	42 min
May 27, 1:39 PM CDT	Severe Thunderstorm Warning	LSX	Boone	37 min
May 27, 1:44 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	61 min
May 27, 1:48 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	42 min
May 27, 1:52 PM CDT	Tornado Warning	LSX	Reynolds	38 min
May 27, 1:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, City of Saint Louis	23 min
May 27, 2:24 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	51 min
May 27, 2:27 PM CDT	Tornado Warning	LSX	Reynolds	48 min
May 27, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Osage	47 min
May 27, 3:10 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	54 min
May 27, 3:35 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Montgomery, Osage, Warren	55 min
May 27, 3:37 PM CDT	Severe Thunderstorm Warning	LSX	Madison	53 min
May 27, 4:06 PM CDT	Tornado Warning	LSX	Crawford, Iron, Reynolds, Washington	54 min
May 27, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	34 min
May 27, 4:19 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	56 min
May 27, 4:45 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Sainte Genevieve, Saint Francois	45 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.