Alert archive / Missouri / Tornado Warnings in 2010

Tornado Warning 37, NWS St. Louis, MO

April 30, 2010Iron County, Madison County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 30, 2010, 9:10 PM CDT for Iron County, Madison County, Missouri. It was in force for 50 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 30, 2010, 9:10 PM CDT (02:10 UTC)
Expired
Apr 30, 2010, 10:00 PM CDT
In force
50 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

Counties Iron County, MO, Madison County, MO

The radar

The St Louis radar (KLSX), 144 km from the middle of the area, began a volume at 02:11 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.

IssuedProductOfficeLasted
Apr 30, 9:03 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 2.2 hours before the alert went out and 291 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, Little Rock, AR at 00:00Z on 2010-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3037 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2010-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 188 square meters per square second.1939587897Sfc1 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
3037 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
525 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
188 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
4.6
Supercell composite
15.8

Open this sounding in Storm Lab

The text

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

581 
WFUS53 KLSX 010210
TORLSX
MOC093-123-010300-
/O.NEW.KLSX.TO.W.0037.100501T0210Z-100501T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
910 PM CDT FRI APR 30 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  IRON COUNTY IN SOUTHEAST MISSOURI...
  MADISON COUNTY IN SOUTHEAST MISSOURI...

* UNTIL 1000 PM CDT

* AT 907 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR ANNAPOLIS...OR 15 MILES SOUTH OF IRONTON...
  AND MOVING NORTHEAST AT 55 MPH.

  IN ADDITION...THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE 
  HAIL AND DAMAGING WINDS UP TO 65 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  FREDERICKTOWN...SACO...ROSELLE...JUNCTION CITY...MARQUAND...
  CATHERINE PLACE AND MINE LA MOTTE.

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 3737 9075 3764 9059 3764 9016 3749 9014
      3747 9015 3742 9015 3730 9053 3731 9055
      3730 9055 3727 9065
TIME...MOT...LOC 0210Z 237DEG 46KT 3740 9059

$$

TILLY
2 follow-up statements
831 
WWUS53 KLSX 010226
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
926 PM CDT FRI APR 30 2010

MOC093-010236-
/O.CAN.KLSX.TO.W.0037.000000T0000Z-100501T0300Z/
IRON MO-
926 PM CDT FRI APR 30 2010

...THE TORNADO WARNING FOR IRON COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3764 9054 3764 9016 3749 9014 3747 9015
      3742 9015 3730 9052
TIME...MOT...LOC 0226Z 226DEG 49KT 3752 9035

$$

MOC123-010300-
/O.CON.KLSX.TO.W.0037.000000T0000Z-100501T0300Z/
MADISON MO-
926 PM CDT FRI APR 30 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR MADISON COUNTY UNTIL 1000
PM CDT...

AT 925 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 6 MILES SOUTHWEST OF FREDERICKTOWN...MOVING 
NORTHEAST AT 55 MPH. 

LOCATIONS IMPACTED INCLUDE...
  FREDERICKTOWN...MARQUAND...JUNCTION CITY...CATHERINE PLACE AND MINE
  LA MOTTE.

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 3764 9054 3764 9016 3749 9014 3747 9015
      3742 9015 3730 9052
TIME...MOT...LOC 0226Z 226DEG 49KT 3752 9035

$$

TILLY
770 
WWUS53 KLSX 010256
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
956 PM CDT FRI APR 30 2010

MOC123-010306-
/O.EXP.KLSX.TO.W.0037.000000T0000Z-100501T0300Z/
MADISON MO-
956 PM CDT FRI APR 30 2010

...THE TORNADO WARNING FOR MADISON COUNTY WILL EXPIRE AT 1000 PM
CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 300 AM. 

LAT...LON 3764 9054 3764 9016 3749 9014 3747 9015
      3742 9015 3730 9052
TIME...MOT...LOC 0256Z 233DEG 48KT 3752 9006

$$

TILLY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 7:40 PM CDTTornado WarningLSXCrawford, Franklin, Jefferson, Washington50 min
Apr 30, 7:45 PM CDTFlash Flood WarningLSXCrawford6 hr
Apr 30, 7:55 PM CDTTornado WarningLSXJefferson, Saint Francois, Washington50 min
Apr 30, 8:07 PM CDTTornado WarningLSXReynolds38 min
Apr 30, 8:14 PM CDTFlash Flood WarningLSXFranklin, Jefferson, Washington6 hr
Apr 30, 8:21 PM CDTTornado WarningLSXJefferson, Saint Louis39 min
Apr 30, 8:39 PM CDTFlash Flood WarningLSXSaint Louis, City of Saint Louis6 hr
Apr 30, 8:43 PM CDTTornado WarningLSXIron, Reynolds47 min
Apr 30, 8:54 PM CDTTornado WarningLSXJefferson, Saint Louis, City of Saint Louis51 min
Apr 30, 9:02 PM CDTTornado WarningLSXJefferson, Sainte Genevieve29 min
Apr 30, 9:23 PM CDTTornado WarningLSXSainte Genevieve, Saint Francois37 min
Apr 30, 9:51 PM CDTTornado WarningLSXSainte Genevieve39 min
May 1, 3:54 AM CDTFlash Flood WatchLSXCrawford, Iron, Jefferson, Madison, Reynolds, Sainte Genevieve and 2 more23 hr

Nearby

Tornado Warnings in Missouri, 2010Every tornado warning in 2010Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.