Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 7, NWS St. Louis, MO

April 10, 2001City of Saint Louis, Missouri; Madison County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 10, 2001, 9:08 PM CDT for City of Saint Louis, Missouri; Madison County, Illinois. It was in force for 67 min. 5 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 10, 2001, 9:08 PM CDT (02:08 UTC)
Expired: Apr 10, 2001, 10:15 PM CDT
In force: 67 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

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

The radar

The St Louis radar (KLSX), 51 km from the middle of the area, began a volume at 02:15 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 10, 9:33 PM CDT	Hail 1	St Louis, MO	Severe storm spotters reported 1 inch hail across extreme north St. Louis City.
Apr 10, 9:35 PM CDT	Tornado F1	Granite City, IL	The 6th and last tornado spawned by the Heavy Precipitation Supercell that moved across the NWS St. Louis, County Warning Area, formed on the east side of Granite City and moved east into south Pontoon Beach. The tornado first damaged an apartment complex near
Apr 10, 9:39 PM CDT	Hail 1.75	Glen Carbon, IL	Storm spotters reported golf ball size hail.
Apr 10, 10:00 PM CDT	Hail 1.75	Edwardsville, IL
Apr 10, 10:25 PM CDT	Hail 1	Troy, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 10, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.1 hours before the alert went out and 200 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: 314 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLSX 110211
TORSTL
ILC119-MOC510-110315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
908 PM CDT TUE APR 10 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI
  MADISON COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1015 PM CDT

* AT 908 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH STRONG ROTATION 20 MILES NORTHWEST OF ST.
  LOUIS...MOVING EAST AT 45 MPH.

* LOCATIONS IN THE PATH...
  ST LOUIS
  ALTON
  GRANITE CITY  
  POAG
  MITCHELL
  HARTFORD
  EDWARDSVILLE
  GLEN CARBON
  KUHN
  FRUIT
  MARINE
  GRANTFORK

THIS IS A VERY DANGEROUS STORM IF YOU ARE IN THE PATH OF THIS
TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE. OTHERWISE...GO
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. AVOID WINDOWS.
ABANDON CARS AND MOBILE HOMES FOR A STURDIER BUILDING OR GET INTO A
DITCH OR CULVERT.

IF YOU ARE IN A VEHCILE...LEAVE IT IMMEDIATELY AND GO TO A STRONG
BUILDING. DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE
EASILY TOSSED AROUND BY TORNADO WINDS. IF NO STRUCTURE IS NEARBY...
SEEK SHELTER IN A DITCH OR LOW SPOT.

LAT...LON 3889 9019 3880 9011 3867 9030 3859 9029
          3859 9025 3866 9017 3867 8961 3901 8967
          3899 9025

GKS/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:08 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	67 min
Apr 10, 7:17 PM CDT	Flash Flood Warning	LSX	Boone	118 min
Apr 10, 7:28 PM CDT	Tornado Warning	LSX	Montgomery	62 min
Apr 10, 7:49 PM CDT	Tornado Warning	LSX	Warren	56 min
Apr 10, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	62 min
Apr 10, 8:27 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis	63 min
Apr 10, 10:14 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	61 min
Apr 10, 11:00 PM CDT	Tornado Warning	LSX	Bond, Fayette	45 min

Nearby

Tornado Warnings in Missouri, 2001 Tornado Warnings in Illinois, 2001 Every tornado warning in 2001 Tornadoes in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.