Alert archive / Missouri / Tornado Warnings in 2024

Tornado Warning 46, NWS St. Louis, MO

May 7, 2024Knox County, Missouri

NWS St. Louis, MO issued this tornado warning at May 7, 2024, 2:34 AM CDT for Knox County, Missouri. It was in force for 14 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: May 7, 2024, 2:34 AM CDT (07:34 UTC)
Expired: May 7, 2024, 2:48 AM CDT
In force: 14 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Knox County, MO

The radar

The Quad Cities radar (KDVN), 205 km from the middle of the area, began a volume at 07:37 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 7, 12:53 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.6 hours before the alert went out and 210 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: 2 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

593 
WFUS53 KLSX 070734
TORLSX
MOC103-070800-
/O.NEW.KLSX.TO.W.0046.240507T0734Z-240507T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service St Louis MO
234 AM CDT Tue May 7 2024

The National Weather Service in St Louis has issued a

* Tornado Warning for...
  Knox County in northeastern Missouri...

* Until 300 AM CDT.

* At 234 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Edina, moving northeast at 55 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  Knox County, including the following locations... Hurdland, Baring,
  and Novelty.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4030 9195 4005 9195 3997 9228 4024 9235
      4030 9235
TIME...MOT...LOC 0734Z 228DEG 48KT 4022 9220 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Carney

1 follow-up statement

340 
WWUS53 KLSX 070748
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
248 AM CDT Tue May 7 2024

MOC103-070758-
/O.CAN.KLSX.TO.W.0046.000000T0000Z-240507T0800Z/
Knox MO-
248 AM CDT Tue May 7 2024

...THE TORNADO WARNING FOR KNOX COUNTY 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 800 AM CDT for northeastern
Missouri.

&&

LAT...LON 4030 9195 4005 9195 3997 9228 4024 9235
      4030 9235
TIME...MOT...LOC 0747Z 228DEG 48KT 4035 9201 

$$

Carney

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 1:12 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	78 min
May 7, 1:25 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Monroe	80 min
May 7, 2:05 AM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	70 min
May 7, 2:15 AM CDT	Severe Thunderstorm Warning	LSX	Osage	60 min
May 7, 2:19 AM CDT	Severe Thunderstorm Warning	LSX	Monroe	41 min
May 7, 2:41 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Montgomery	64 min
May 7, 2:57 AM CDT	Tornado Warning	LSX	Audrain, Ralls	17 min
May 7, 2:59 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	46 min
May 7, 3:06 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike, Warren	54 min
May 7, 3:09 AM CDT	Severe Thunderstorm Warning	LSX	Crawford	36 min
May 7, 3:27 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds, Washington	63 min
May 7, 3:41 AM CDT	Severe Thunderstorm Warning	LSX	Franklin	49 min
May 7, 3:49 AM CDT	Tornado Warning Tornado observed	LSX	Crawford, Franklin, Washington	26 min
May 7, 4:05 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	40 min
May 7, 4:13 AM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	47 min
May 7, 4:16 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Warren	44 min
May 7, 4:20 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds, Washington	40 min
May 7, 4:23 AM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis	37 min
May 7, 4:48 AM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Francois	42 min
May 7, 4:58 AM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	47 min

Nearby

Tornado Warnings in Missouri, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.