Alert archive / Missouri / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 310, NWS St. Louis, MO

July 29, 20237 counties in Missouri; Calhoun County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 29, 2023, 2:47 PM CDT for 7 counties in Missouri; Calhoun County, Illinois. It was in force for 43 min. 32 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: Jul 29, 2023, 2:47 PM CDT (19:47 UTC)
Expired: Jul 29, 2023, 3:30 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

Counties Calhoun County, IL, Franklin County, MO, Gasconade County, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 17 km from the middle of the area, began a volume at 19:48 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
Jul 29, 2:51 PM CDT	TSTM WND GST 60	Wright City, MO	Local affiliate estimated gusts to be 60 mph or higher. Courtesy of KTVI-TV.
Jul 29, 2:53 PM CDT	TSTM WND DMG	Troy, MO	4-5 ft diameter tree fell on residence near west cherry and 4th street. EM stated that multiple areas around the county suffered tree damage. Repeater to the Monroe Fire Dept was knocked out by wind.
Jul 29, 2:53 PM CDT	TSTM WND GST 70	Gerald, MO	Caller estimated winds of 65-70 mph ahead of the main line of thunderstorms.
Jul 29, 2:55 PM CDT	TSTM WND DMG	1 Se Troy, MO	Multiple trees down south of Troy. Largest limbs were 6-10 inches in diameter. Spotter recorded 53 mph gust at his personal weather station their residence in Troy.
Jul 29, 2:55 PM CDT	TSTM WND DMG	1 Wsw Flint Hill, MO	shingles peeled off of roof. picture from social media. time estimate from radar.
Jul 29, 3:00 PM CDT	TSTM WND DMG	Gerald, MO	power lines down. time estimate from radar.
Jul 29, 3:07 PM CDT	TSTM WND DMG	Union, MO	Trees reported down in the union area. Time estimated by radar.
Jul 29, 3:12 PM CDT	TSTM WND DMG	1 Ese O'Fallon, MO	Large limb down over a residential driveway. Photos submitted via social media. Time estimated by radar.
Jul 29, 3:12 PM CDT	TSTM WND DMG	2 Nw O'Fallon, MO	Multiple limbs down off Magnolia Drive. Report submitted via social media with photos. Time estimated by radar.
Jul 29, 3:14 PM CDT	TSTM WND DMG	Owensville, MO	Corrects previous tstm wnd dmg report from Owensville. Trees down on power lines in Gasconade County. time estimate from radar.
Jul 29, 3:14 PM CDT	TSTM WND DMG	Owensville, MO	Trees down in Gasconade County. time estimate from radar.
Jul 29, 3:15 PM CDT	TSTM WND DMG	1 Nw Dardenne Prairie, MO	6-8 inch tree snapped and Crossroads Elementary. time estimate from radar.
Jul 29, 3:15 PM CDT	TSTM WND DMG	2 N Saint Paul, MO	Trees approx. 50 ft. tall and 8-10 in. diameter. Several houses lost siding in Riverdale neighborhood (Hwy 79/Hwy Y area). Multiple houses had garage doors caved in from winds. Electricity out in area.
Jul 29, 3:16 PM CDT	TSTM WND DMG	1 Wnw Saint Peters, MO	mature tree fallen on house. 1 foot diameter tree fallen on house. time estimate from radar.
Jul 29, 3:16 PM CDT	TSTM WND DMG	Saint Clair, MO	Tree reported down around St. Clair. Time estimated by radar.
Jul 29, 3:17 PM CDT	TSTM WND DMG	1 Ese O'Fallon, MO	Several trees down in the area of Feise Road and Highway K. Pictures accompanied report via social media. Time of occurrence estimated by radar.
Jul 29, 3:20 PM CDT	TSTM WND DMG	1 Sw Saint Peters, MO	Several tree limbs down. Wind gusts estimated to be 60-70 mph.
Jul 29, 3:21 PM CDT	TSTM WND DMG	4 W Kampville, MO	MODOT will be closing the roadway near the junction of highway B and highway C in northern St. Charles County due to multiple powerlines down in the area. Time of event estimated by radar.
Jul 29, 3:21 PM CDT	TSTM WND GST 49	4 S Weldon Spring, MO
Jul 29, 3:23 PM CDT	TSTM WND DMG	2 Sse Catawissa, MO	Large tree snapped at the base. Photo submitted via social media. Time estimated by radar.
Jul 29, 3:23 PM CDT	TSTM WND GST 60	4 Nnw Saint Peters, MO
Jul 29, 3:25 PM CDT	TSTM WND DMG	Dardenne Prairie, MO	6 inch tree limbs down. A limb fell on house and caused gutter damage.
Jul 29, 3:28 PM CDT	TSTM WND DMG	2 W O'Fallon, MO	10 inch diameter tree down on Hwy P/Bryan Road near Mexico Road. Time estimated from radar.
Jul 29, 3:28 PM CDT	TSTM WND DMG	3 Sse Catawissa, MO	Large limb down partially covering highway HH. Photos submitted via social media. Time estimated by radar.
Jul 29, 3:29 PM CDT	TSTM WND DMG	1 Ese Saint Charles, MO	St. Charles County Emergency Operations Center reporting multiple trees and wires down across the county. Transformer fire reported near Sawyer and W Clay.
Jul 29, 3:29 PM CDT	TSTM WND DMG	2 Ese Saint Charles, MO	40 ft tree down at clintonview court in st charles city.
Jul 29, 3:30 PM CDT	TSTM WND DMG	1 N Saint Peters, MO	small tree down, flashing torn from roof.
Jul 29, 3:33 PM CDT	TSTM WND GST 72	2 Nne Saint Charles, MO	Spotter measured the gust with an anemometer installed at their residence.
Jul 29, 3:38 PM CDT	TSTM WND GST 54	4 S Weldon Spring, MO	Corrects previous tstm wnd gst report from 4 S Weldon Spring. Location: KSUS (Spirt of St. Louis Airport).
Jul 29, 3:38 PM CDT	TSTM WND GST 54	4 S Weldon Spring, MO
Jul 29, 3:39 PM CDT	TSTM WND DMG	3 Nne O'Fallon, MO	Multiple trees down near St. Matthews and Manor Hill in OFallon. Time estimated by radar.
Jul 29, 3:40 PM CDT	TSTM WND DMG	Wildwood, MO	Large tree branches 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
Jul 29, 11:28 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 237 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: 105 J/kg
Mixed-layer CIN: -536 J/kg
Mixed-layer LCL: 1292 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

586 
WUUS53 KLSX 291947
SVRLSX
ILC013-MOC071-073-113-163-183-189-219-292030-
/O.NEW.KLSX.SV.W.0310.230729T1947Z-230729T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
247 PM CDT Sat Jul 29 2023

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Calhoun County in southwestern Illinois...
  St. Charles County in east central Missouri...
  Lincoln County in east central Missouri...
  Franklin County in east central Missouri...
  Northwestern St. Louis County in east central Missouri...
  Southeastern Warren County in east central Missouri...
  Central Pike County in northeastern Missouri...
  Central Gasconade County in east central Missouri...

* Until 330 PM CDT.

* At 246 PM CDT, severe thunderstorms were located along a line
  extending from near Tarrants to 6 miles southwest of Eolia to near
  Wright City to near Treloar to near Owensville, moving east at 45
  mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters. At 240 PM, a wind gust of 68 
           mph was measured in Warrenton.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Severe thunderstorms will be near...
  Wentzville, Troy, Warrenton, Bowling Green, Wright City, 
  Owensville, New Haven, Moscow Mills, Gerald, and Davis around 250 
  PM CDT.
  Washington, Fountain N' Lakes, and Beaufort around 255 PM CDT.
  Lake St. Louis, St. Paul, New Melle, Josephville, Chain of Rocks, 
  and Dutzow around 300 PM CDT.
  O'Fallon, Dardenne Prairie, Union, Elsberry, Winfield, 
  Clarksville, and Augusta around 305 PM CDT.

Other locations in the path of these severe thunderstorms include St.
Peters, Weldon Spring, Cottleville, Villa Ridge, Gray Summit,
Defiance, St. Charles, Chesterfield, Wildwood, Pacific, St. Clair,
Spirit of St. Louis Airport, Hardin, Parkway, Weldon Spring Heights,
Belleview, Maryland Heights, Eureka, Clarkson Valley, Miramiguoa Park
and Harvester.

This includes the following highways...
 Interstate 44 in Missouri between exits 230 and 265.
 Interstate 70 in Missouri between exits 193 and 231.

This also includes Babler Memorial State Park, Route 66 State Park,
Cuivre River State Park, First Missouri State Capitol Historic Site,
and Robertsville State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3935 9063 3929 9060 3920 9059 3914 9062
      3901 9058 3896 9053 3897 9045 3873 9042
      3852 9059 3848 9063 3849 9066 3846 9068
      3848 9073 3839 9074 3820 9097 3834 9159
      3865 9126 3889 9111 3918 9112 3946 9126
TIME...MOT...LOC 1946Z 284DEG 39KT 3938 9123 3917 9109 3889 9105 3865
9123 3839 9151

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Jaja

1 follow-up statement

089 
WWUS53 KLSX 292002
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
302 PM CDT Sat Jul 29 2023

ILC013-MOC071-073-113-163-183-189-219-292030-
/O.CON.KLSX.SV.W.0310.000000T0000Z-230729T2030Z/
Calhoun IL-St. Charles MO-Lincoln MO-Franklin MO-St. Louis MO-
Warren MO-Pike MO-Gasconade MO-
302 PM CDT Sat Jul 29 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR CALHOUN COUNTY IN SOUTHWESTERN ILLINOIS...ST. CHARLES...
LINCOLN...FRANKLIN...NORTHWESTERN ST. LOUIS AND SOUTHEASTERN WARREN
COUNTIES IN EAST CENTRAL MISSOURI...CENTRAL PIKE COUNTY IN
NORTHEASTERN MISSOURI AND CENTRAL GASCONADE COUNTIES IN EAST CENTRAL
MISSOURI...

At 302 PM CDT, severe thunderstorms were located along a line
extending from near Louisiana to 7 miles east of Davis to near Chain
of Rocks to Wentzville to near Marthasville to near Gerald, moving
southeast at 45 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
  O'Fallon, St. Peters, Wentzville, Lake St. Louis, Washington, 
  Dardenne Prairie, Union, Weldon Spring, Cottleville, Elsberry, 
  Chesterfield, Wildwood, St. Clair, Villa Ridge, Gray Summit, 
  Spirit of St. Louis Airport, Weldon Spring Heights, St. Charles, 
  Pacific, Clarkson Valley, Parkway, Harvester, Ballwin, Maryland 
  Heights, Creve Coeur, Bridgeton, Town and Country, Eureka, 
  Ellisville, Hardin, Champ, Hazelwood, Manchester and Orchard 
  Farms.

This also includes Babler Memorial State Park, Route 66 State Park,
Cuivre River State Park, First Missouri State Capitol Historic Site,
and Robertsville State Park.
 
This includes the following highways...
 Interstate 44 in Missouri between exits 230 and 265.
 Interstate 70 in Missouri between exits 193 and 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3935 9063 3929 9060 3920 9059 3914 9062
      3901 9058 3896 9053 3897 9045 3873 9042
      3852 9059 3848 9063 3849 9066 3846 9068
      3848 9073 3839 9074 3820 9097 3834 9159
      3865 9126 3889 9111 3918 9112 3946 9126
TIME...MOT...LOC 2002Z 297DEG 39KT 3938 9108 3908 9088 3890 9084 3879
9087 3866 9101 3841 9129

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Jaja

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 12:46 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Moniteau, Monroe, Shelby	59 min
Jul 29, 1:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Audrain, Callaway, Franklin, Gasconade, Monroe, Montgomery and 4 more	39 min
Jul 29, 1:46 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Ralls, Shelby	44 min
Jul 29, 2:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Franklin, Gasconade, Lincoln, Montgomery, Osage and 3 more	48 min
Jul 29, 3:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, City of Saint Louis	36 min
Jul 29, 3:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Jefferson, Saint Charles, Saint Louis, City of Saint Louis	48 min
Jul 29, 4:16 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LSX	Jefferson, Sainte Genevieve	44 min
Jul 29, 4:47 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Sainte Genevieve	58 min
Jul 29, 5:43 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	32 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2023 Severe Thunderstorm Warnings in Illinois, 2023 Every severe thunderstorm warning in 2023

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.