Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Springfield, MO

April 29, 2021Oregon County, Missouri

NWS Springfield, MO issued this severe thunderstorm warning at Apr 29, 2021, 2:51 AM CDT for Oregon County, Missouri. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 29, 2021, 2:51 AM CDT (07:51 UTC)
Expired: Apr 29, 2021, 3:15 AM CDT
In force: 24 min
Issued by: NWS Springfield, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Oregon County, MO

The radar

The Memphis radar (KNQA), 191 km from the middle of the area, began a volume at 07:55 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 7.9 hours before the alert went out and 229 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: 48 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 320 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

320 
WUUS53 KSGF 290751
SVRSGF
MOC149-290815-
/O.NEW.KSGF.SV.W.0040.210429T0751Z-210429T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Springfield MO
251 AM CDT Thu Apr 29 2021

The National Weather Service in Springfield has issued a

* Severe Thunderstorm Warning for...
  Southeastern Oregon County in south central Missouri...

* Until 315 AM CDT.

* At 250 AM CDT, a severe thunderstorm was located 9 miles south of
  Alton, or 11 miles east of Thayer, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Alton...                          Couch...
  Myrtle...                         Wilderness...

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 3650 9140 3670 9143 3683 9115 3683 9114
      3666 9112 3650 9113
TIME...MOT...LOC 0750Z 235DEG 47KT 3656 9134 

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

Terry

2 follow-up statements

614 
WWUS53 KSGF 290804
SVSSGF

Severe Weather Statement
National Weather Service Springfield MO
304 AM CDT Thu Apr 29 2021

MOC149-290815-
/O.CON.KSGF.SV.W.0040.000000T0000Z-210429T0815Z/
Oregon MO-
304 AM CDT Thu Apr 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 AM CDT
FOR SOUTHEASTERN OREGON COUNTY...

At 304 AM CDT, severe thunderstorms were located along a line
extending from near Alton to near Gatewood, moving northeast at 45
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Alton...                          Couch...
Myrtle...                         Wilderness...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3650 9140 3670 9143 3683 9115 3683 9114
      3666 9112 3650 9113
TIME...MOT...LOC 0804Z 231DEG 37KT 3670 9131 3657 9116 

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

Terry

489 
WWUS53 KSGF 290811
SVSSGF

Severe Weather Statement
National Weather Service Springfield MO
311 AM CDT Thu Apr 29 2021

MOC149-290820-
/O.EXP.KSGF.SV.W.0040.000000T0000Z-210429T0815Z/
Oregon MO-
311 AM CDT Thu Apr 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OREGON COUNTY
WILL EXPIRE AT 315 AM CDT...
    
The storms which prompted the warning have exited the warned area. 
Therefore, the warning will be allowed to expire.

LAT...LON 3650 9140 3670 9143 3683 9115 3683 9114
      3666 9112 3650 9113
TIME...MOT...LOC 0810Z 235DEG 47KT 3672 9127 3659 9112 

$$

Terry

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 7:42 PM CDT	Areal Flood Warning	SGF	McDonald	23 hr
Apr 29, 12:38 AM CDT	Flash Flood Warning	SGF	Greene, Webster, Wright	3 hr
Apr 29, 1:58 AM CDT	Flash Flood Warning	SGF	Phelps	2 hr
Apr 29, 5:22 AM CDT	Areal Flood Warning	SGF	Christian, Greene, Webster	12 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.