Alert archive / Missouri / Tornado Warnings in 2010

Tornado Warning 49, NWS St. Louis, MO

June 21, 2010Knox County, Lewis County, Missouri

NWS St. Louis, MO issued this tornado warning at Jun 21, 2010, 9:15 PM CDT for Knox County, Lewis County, Missouri. It was in force for 45 min. 2 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 21, 2010, 9:15 PM CDT (02:15 UTC)
Expired: Jun 21, 2010, 10:00 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Knox County, MO, Lewis County, MO

The radar

The Quad Cities radar (KDVN), 189 km from the middle of the area, began a volume at 02:16 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
Jun 21, 9:20 PM CDT	FUNNEL CLOUD	6 Wnw Colony, MO	TRAINED SPOTTER LOCATED 3.5 S OF RUTLEDGE OR 0.5 S OF MILLPORT. SPOTTER OBSERVED A WELL DEFINED FUNNEL CLOUD MOVE PAST HIS LOCATION BUT COULD NOT TELL IF IT REACHED THE GROUND DUE TO TREELINE. TIME IS ESTIMATED FROM RADAR.
Jun 21, 9:49 PM CDT	TORNADO	7 Nne La Belle, MO	NEAR DEER RIDGE...SPOTTER REPORT RELAYED THROUGH COUNTY EM

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
Jun 21, 4:36 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.3 hours before the alert went out and 194 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: 2621 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 930 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 7.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

203 
WFUS53 KLSX 220215
TORLSX
MOC103-111-220300-
/O.NEW.KLSX.TO.W.0049.100622T0215Z-100622T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
915 PM CDT MON JUN 21 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN KNOX COUNTY IN NORTHEAST MISSOURI...
  NORTHWESTERN LEWIS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 1000 PM CDT

* AT 912 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS 
  DANGEROUS STORM WAS LOCATED NEAR RUTLEDGE...OR 9 MILES NORTH OF   
  EDINA...AND MOVING EAST AT 30 MPH. THIS STORM HAS A HISTORY OF 
  PRODUCING HAIL TO GOLF BALL SIZE.

* LOCATIONS IMPACTED INCLUDE...
  COLONY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4031 9196 4030 9195 4026 9194 4026 9174
      4009 9175 4025 9208 4030 9214 4031 9213
TIME...MOT...LOC 0214Z 286DEG 25KT 4029 9212

$$

TES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 8:57 PM CDT	Tornado Warning	LSX	Knox	48 min
Jun 21, 9:52 PM CDT	Tornado Warning	LSX	Lewis	38 min
Jun 21, 10:27 PM CDT	Tornado Warning	LSX	Lewis	22 min
Jun 22, 3:23 AM CDT	River Flood Warning	LSX	Lewis	3 days
Jun 22, 9:40 AM CDT	Severe Thunderstorm Warning	LSX	Lewis	54 min

Nearby

Tornado Warnings in Missouri, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.