Alert archive / Missouri / Tornado Warnings in 2010

Tornado Warning 25, NWS St. Louis, MO

April 24, 2010Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 24, 2010, 4:43 PM CDT for Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 32 min. 8 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: Apr 24, 2010, 4:43 PM CDT (21:43 UTC)
Expired: Apr 24, 2010, 5:15 PM CDT
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Jersey County, IL, Madison County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 46 km from the middle of the area, began a volume at 21:43 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
Apr 24, 4:48 PM CDT	TSTM WND DMG	2 W Overland, MO	POWER LINES AND TREES BLOWN DOWN AT THE INTERSECTION OF PAGE AND LINDBERGH.
Apr 24, 4:48 PM CDT	TSTM WND DMG	Overland, MO	THREE FOOT DIAMETER TREE BLOWN DOWN AT LACKLAND ROAD AND WOODSON ROAD.
Apr 24, 4:49 PM CDT	HAIL 0.25	Spanish Lake, MO
Apr 24, 4:50 PM CDT	HAIL 0.7	Florissant, MO
Apr 24, 4:58 PM CDT	HAIL 0.7	Alton, IL
Apr 24, 5:00 PM CDT	HAIL 0.25	Godfrey, IL
Apr 24, 5:04 PM CDT	HAIL 0.5	2 Nw Alton, IL
Apr 24, 5:05 PM CDT	TSTM WND DMG	1 Wsw Wood River, IL	8 INCH DIAMETER TREE BLOWN DOWN AT ILLINOIS ROUTES 143 AND 3.

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
Apr 24, 3:20 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.7 hours before the alert went out and 198 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: 494 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 601 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

510 
WFUS53 KLSX 242143
TORLSX
ILC083-119-MOC183-189-510-242215-
/O.NEW.KLSX.TO.W.0025.100424T2143Z-100424T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
443 PM CDT SAT APR 24 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 515 PM CDT

* AT 439 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR BERKELEY...AND MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HAZELWOOD...FLORISSANT...SPANISH LAKE...BLACK JACK...WOOD RIVER...
  ALTON...GODFREY...WEST ALTON...PORTAGE DES SIOUX...ELSAH AND
  FOSTERBURG.

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.

&&

LAT...LON 3866 9024 3869 9046 3902 9041 3901 9015
      3900 9015 3900 9005 3900 8998
TIME...MOT...LOC 2143Z 191DEG 26KT 3877 9033

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 8:51 PM CDT	Tornado Warning	LSX	Calhoun, Pike	18 min
Apr 24, 11:05 AM CDT	Flash Flood Watch	LSX	Adams	14 hr
Apr 24, 4:20 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	25 min
Apr 24, 4:25 PM CDT	Tornado Warning	LSX	Madison, Saint Clair	35 min
Apr 24, 4:34 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	41 min
Apr 24, 5:03 PM CDT	Tornado Warning	LSX	Bond, Jersey, Macoupin, Madison, Montgomery	57 min
Apr 24, 5:14 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	36 min
Apr 24, 5:20 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	20 min
Apr 24, 5:57 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	38 min
Apr 24, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	18 min
Apr 23, 7:24 PM CDT	Tornado Warning	LSX	Lincoln, Warren	51 min
Apr 23, 7:48 PM CDT	Flash Flood Warning	LSX	Boone, Cole, Moniteau	6 hr
Apr 23, 8:11 PM CDT	Tornado Warning	LSX	Lincoln, Pike	49 min
Apr 24, 1:29 AM CDT	Areal Flood Warning	LSX	Boone, Cole, Moniteau	9 hr
Apr 24, 2:29 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Gasconade	46 min
Apr 24, 3:07 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	23 min
Apr 24, 3:31 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Sainte Genevieve, Saint Francois, Saint Louis, Washington	44 min
Apr 24, 3:52 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Osage	38 min
Apr 24, 3:59 PM CDT	Tornado Warning	LSX	Franklin, Jefferson, Saint Louis	31 min
Apr 24, 4:01 PM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Osage	6 hr
Apr 24, 4:53 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Franklin, Gasconade, Montgomery, Osage and 1 more	52 min
Apr 24, 5:09 PM CDT	Tornado Warning	LSX	Gasconade, Lincoln, Montgomery, Warren	51 min
Apr 24, 5:20 PM CDT	Areal Flood Advisory	LSX	Audrain, Boone, Callaway, Marion, Monroe, Ralls and 1 more	6 hr
Apr 24, 5:34 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Montgomery, Pike, Ralls	41 min
Apr 24, 5:45 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	6 hr
Apr 24, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Pike, Warren	24 min
Apr 24, 6:13 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Pike, Ralls	47 min

Nearby

Tornado Warnings in Missouri, 2010 Tornado Warnings in Illinois, 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.