Alert archive / Illinois / Tornado Warnings in 2010

Tornado Warning 13, NWS St. Louis, MO

April 4, 2010Macoupin County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 4, 2010, 10:35 PM CDT for Macoupin County, Illinois. It was in force for 40 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: Apr 4, 2010, 10:35 PM CDT (03:35 UTC)
Expired: Apr 4, 2010, 11:15 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

County Macoupin County, IL

The radar

The St Louis radar (KLSX), 92 km from the middle of the area, began a volume at 03:36 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 4, 10:38 PM CDT	HAIL 0.7	9 Wnw Carlinville, IL
Apr 4, 10:45 PM CDT	HAIL 1.75	3 Wsw Standard City, IL

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 4, 8:43 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.6 hours before the alert went out and 149 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2143 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 480 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

367 
WFUS53 KLSX 050335
TORLSX
ILC117-050415-
/O.NEW.KLSX.TO.W.0013.100405T0335Z-100405T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1035 PM CDT SUN APR 4 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 1115 PM CDT

* AT 1032 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 7 MILES NORTHEAST OF KEMPER...OR 10 MILES WEST OF
  CARLINVILLE...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CARLINVILLE...NILWOOD...STANDARD CITY...ATWATER AND HORNSBY.

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 3910 8971 3919 9015 3939 9011 3942 8971
TIME...MOT...LOC 0335Z 289DEG 43KT 3927 9003

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 8:34 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	26 min
Apr 4, 8:55 PM CDT	Tornado Warning	LSX	Calhoun	35 min
Apr 4, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Pike	32 min
Apr 4, 9:22 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	38 min
Apr 4, 9:38 PM CDT	Tornado Warning	LSX	Greene, Jersey	26 min
Apr 4, 9:50 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Pike	40 min
Apr 4, 9:55 PM CDT	Tornado Warning	LSX	Macoupin	35 min
Apr 4, 10:16 PM CDT	Tornado Warning	LSX	Greene, Macoupin	29 min
Apr 4, 10:30 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Montgomery	45 min
Apr 4, 10:41 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	34 min
Apr 4, 10:48 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	42 min
Apr 4, 11:13 PM CDT	Tornado Warning	LSX	Jersey, Macoupin	32 min
Apr 4, 11:29 PM CDT	Tornado Warning	LSX	Montgomery	46 min
Apr 4, 11:51 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	39 min
Apr 4, 11:54 PM CDT	Severe Thunderstorm Warning	LSX	Madison	36 min
Apr 5, 12:30 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Pike	30 min
Apr 5, 2:50 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Montgomery	40 min
Apr 5, 3:28 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	47 min
Apr 5, 4:07 PM CDT	Areal Flood Advisory	LSX	Montgomery	4 hr
Apr 5, 4:16 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	32 min

Nearby

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.