Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS St. Louis, MO

May 27, 2021Crawford County, Gasconade County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2021, 1:24 PM CDT for Crawford County, Gasconade County, Missouri. It was in force for 51 min. 5 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, 2021, 1:24 PM CDT (18:24 UTC)
Expired: May 27, 2021, 2:15 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Crawford County, MO, Gasconade County, MO

The radar

The St Louis radar (KLSX), 95 km from the middle of the area, began a volume at 18:27 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, 1:30 PM CDT	TSTM WND DMG	Cuba, MO	TREE UPROOTED, APPROXIMATELY 2 FOOT DIAMETER.
May 27, 1:32 PM CDT	TSTM WND GST 58	Cuba, MO
May 27, 1:35 PM CDT	TSTM WND DMG	Cuba, MO	SEVERAL LARGE TREES AND NUMEROUS TREE LIMBS BLOWN DOWN IN CUBA.
May 27, 1:35 PM CDT	TSTM WND GST 60	Cuba, MO
May 27, 1:45 PM CDT	TSTM WND DMG	Leasburg, MO	FENCE DAMAGE TO PROPERTY. SEVERAL PORTIONS OF THE VINYL STRUCTURE WERE BLOWN AWAY.

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, 11:26 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.4 hours before the alert went out and 246 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: 295 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 964 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

358 
WUUS53 KLSX 271824
SVRLSX
MOC055-073-271915-
/O.NEW.KLSX.SV.W.0052.210527T1824Z-210527T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
124 PM CDT Thu May 27 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northern Crawford County in east central Missouri...
  Southern Gasconade County in east central Missouri...

* Until 215 PM CDT.

* At 124 PM CDT, a severe thunderstorm was located over St. James,
  moving east at 30 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...
  Cuba, Steelville and Leasburg.

This includes Interstate 44 in Missouri between exits 203 and 218.
 
This also includes Onondaga Cave State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3791 9153 3815 9153 3815 9164 3823 9164
      3821 9137 3820 9137 3820 9123 3787 9118
TIME...MOT...LOC 1824Z 271DEG 25KT 3804 9160 

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

Carney

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 11:13 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	47 min
May 27, 11:50 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Lincoln, Saint Charles, Saint Louis, Warren, City of Saint Louis	55 min
May 27, 12:39 PM CDT	Areal Flood Advisory	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis	3 hr
May 27, 1:09 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Louis	51 min
May 27, 1:51 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Washington	39 min
May 27, 2:46 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	29 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Every 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.