Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 85, NWS St. Louis, MO

June 20, 2021Audrain County, Boone County, Callaway County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 10:22 PM CDT for Audrain County, Boone County, Callaway County, Missouri. It was in force for 38 min. 24 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
Jun 20, 2021, 10:22 PM CDT (03:22 UTC)
Expired
Jun 20, 2021, 11:00 PM CDT
In force
38 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
70.0 mph

Counties Audrain County, MO, Boone County, MO, Callaway County, MO

The radar

The St Louis radar (KLSX), 140 km from the middle of the area, began a volume at 03:24 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

TimeReportWhereRemark
Jun 20, 10:24 PM CDTTSTM WND DMG1 Wsw Midway, MOLARGE TREE INTO HOME ALONG SOUTH TRAILS TERRACE.
Jun 20, 10:24 PM CDTTSTM WND DMG3 Ne Midway, MOMULTIPLE TREE BLOCKING RT E FORCING CLOSURE OF ROAD.
Jun 20, 10:26 PM CDTTSTM WND DMG1 Ene Columbia, MOTREE INTO POWER LINES AT AMELIA AND MONT VERNON STREET.
Jun 20, 10:26 PM CDTTSTM WND DMG1 Ne Columbia, MOTREE DOWN OVER ROADWAY AT COLLEGE AND WILKES ROADS.
Jun 20, 10:26 PM CDTTSTM WND DMG1 Nne Columbia, MOCORRECTS PREVIOUS TSTM WND DMG REPORT. 25 BY 75 FT SECTION OF BOONE ELECTRIC COOP BUILDING BLOWN OFF.
Jun 20, 10:26 PM CDTTSTM WND DMG1 Nne Columbia, MOROOF OFF OF BUILDING.
Jun 20, 10:26 PM CDTTSTM WND DMG3 Nne Columbia, MOLARGE TREE BLOCKING ROADWAY.
Jun 20, 10:26 PM CDTTSTM WND DMG3 Ssw Columbia, MOLARGE TREE PARTIALLY BLOCKING ROADWAY.
Jun 20, 10:26 PM CDTTSTM WND DMG3 Sw Columbia, MOTREE AND POWER LINES DOWN ON HILLSHIRE COURT.
Jun 20, 10:27 PM CDTTSTM WND DMG1 E Columbia, MOLARGE TREE LIMB BLOCKING ROADWAY AT WILLIAMS AND BRIGHTON ST.
Jun 20, 10:27 PM CDTTSTM WND DMG1 E Columbia, MOTREE DOWN OVER OLD 63 AND WALNUT.
Jun 20, 10:27 PM CDTTSTM WND DMG1 Ene Columbia, MOLARGE TREE DOWNED ONTO PRIVATE PARKING LOT.
Jun 20, 10:27 PM CDTTSTM WND DMG1 N Columbia, MOLARGE TREE ACROSS 8TH STREET.
Jun 20, 10:27 PM CDTTSTM WND DMG1 Se Columbia, MOLARGE TREE ON HOME ALONG THILLY ROAD.
Jun 20, 10:27 PM CDTTSTM WND DMG1 Wnw Columbia, MO*** 1 INJ *** TREE FELL AND STRUCK A PERSON ON THE HEAD ALONG COOK AVENUE.
Jun 20, 10:27 PM CDTTSTM WND DMG1 Wnw Columbia, MO*** 1 INJ *** TREE STRUCK A PERSON ON THE HEAD ALONG COOK STREET.
Jun 20, 10:27 PM CDTTSTM WND DMG2 Ese Columbia, MOTREES DOWNED ONTO ROADWAY.
Jun 20, 10:28 PM CDTTSTM WND DMG1 Nne Columbia, MOPOWERS LINES DOWN ONTO ROADWAY NEAR PANNELL ST AND BUSINESS 70.
Jun 20, 10:28 PM CDTTSTM WND DMG4 Se Columbia, MOTREE DOWN BLOCKING NEW HAVEN ROAD.
Jun 20, 10:28 PM CDTTSTM WND DMG6 Sse Columbia, MOTREE DOWNED ONTO POWERLINES.
Jun 20, 10:29 PM CDTTSTM WND DMG5 Se Columbia, MOTREE ACROSS ROADWAY.
Jun 20, 10:48 PM CDTTSTM WND DMG1 Nne Kingdom City, MOTREES DOWN IN KINGDOM CITY.
Jun 20, 10:54 PM CDTTSTM WND DMG5 Ese Kingdom City, MOTREE OVER Z HIGHWAY.
Jun 20, 10:57 PM CDTTSTM WND DMG5 Ese Kingdom City, MOCORRECTS PREVIOUS TSTM WND DMG REPORT FROM 5 ESE KINGDOM CITY. TREE OVER Z HIGHWAY.

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.

IssuedProductOfficeLasted
Jun 20, 8:10 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.4 hours before the alert went out and 270 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2021-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1346 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2021-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1346 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
1683 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.2
Supercell composite
5.8

Open this sounding in Storm Lab

The text

As transmitted.

884 
WUUS53 KLSX 210322
SVRLSX
MOC007-019-027-210400-
/O.NEW.KLSX.SV.W.0085.210621T0322Z-210621T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1022 PM CDT Sun Jun 20 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Boone County in central Missouri...
  Southwestern Audrain County in central Missouri...
  Callaway County in central Missouri...

* Until 1100 PM CDT.

* At 1021 PM CDT, severe thunderstorms were located along a line
  extending from near Centralia to near Midway, moving east at 45
  mph.

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

  SOURCE...Radar indicated.

  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...
  Hallsville around 1025 PM CDT.
  Columbia Regional Airport around 1040 PM CDT.

Other locations in the path of these severe thunderstorms include
Mexico, Fulton and Shamrock.

This includes Interstate 70 in Missouri between exits 115 and 161.
 
This also includes Rock Bridge State Park, Finger Lakes State Park,
and Jewell Cemetery Historic Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3899 9256 3925 9243 3925 9238 3908 9163
      3895 9164 3872 9182 3889 9248 3891 9248
      3898 9257
TIME...MOT...LOC 0321Z 285DEG 40KT 3920 9219 3892 9249 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

19

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 8:41 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Shelby49 min
Jun 20, 9:07 PM CDTTornado WarningLSXMarion, Shelby38 min
Jun 20, 9:17 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Marion, Monroe, Ralls, Shelby43 min
Jun 20, 9:42 PM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Monroe48 min
Jun 20, 9:59 PM CDTSevere Thunderstorm WarningLSXMarion, Monroe, Pike, Ralls46 min
Jun 20, 10:10 PM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Monroe, Montgomery, Pike, Ralls50 min
Jun 20, 10:27 PM CDTAreal Flood AdvisoryLSXAudrain, Boone, Monroe3 hr
Jun 20, 10:42 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau48 min
Jun 20, 10:55 PM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Callaway, Montgomery35 min
Jun 20, 11:29 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Franklin, Gasconade, Lincoln and 3 more31 min
Jun 20, 11:41 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles19 min
Jun 20, 11:59 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade, Montgomery, Osage, Warren31 min
Jun 21, 12:34 AM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau26 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021Every severe thunderstorm warning in 2021

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.