Alert archive / Illinois / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 41, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2001, 6:11 AM CDT for Macoupin County, Illinois. It was in force for 34 min. 1 report 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, 6:11 AM CDT (11:11 UTC)
- Expired
- Apr 10, 2001, 6:45 AM CDT
- In force
- 34 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Macoupin County, IL
The radar
The St Louis radar (KLSX), 96 km from the middle of the area, began a volume at 11:11 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 10, 6:22 AM CDT | Hail 0.75 | Carlinville, IL | The County Emergency Manager reported 3/4 inch hail. |
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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 11.2 hours before the alert went out and 146 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.
- Mixed-layer CAPE
- 1891 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 2017 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS53 KLSX 101112
SVRSTL
ILC117-101145-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
611 AM CDT TUE APR 10 2001
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MACOUPIN COUNTY IN SOUTHWEST ILLINOIS
* UNTIL 645 AM CDT
* AT 611 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF CARLINVILLE...MOVING
NORTHEAST AT 50 MPH.
* LOCATIONS IN THE PATH...
CARLINVILLE
GIRARD
THIS THUNDERSTORM IS CAPABLE OF PRODUCING LARGE HAIL THAT CAN CAUSE
SERIOUS INJURY AND EXTENSIVE PROPERTY DAMAGE. TAKE SHELTER INSIDE OF
A STURDY BUILDING NOW
LAT...LON 3928 9012 3912 8998 3923 8971 3953 8971
3953 8992
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 9:59 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 46 min |
| Apr 9, 10:06 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 39 min |
| Apr 9, 10:06 PM CDT | Severe Thunderstorm Warning | LSX | Madison | 39 min |
| Apr 9, 10:45 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 45 min |
| Apr 9, 10:46 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 44 min |
| Apr 10, 11:32 AM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Madison | 43 min |
| Apr 10, 12:07 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Montgomery | 38 min |
| Apr 10, 12:44 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 46 min |
| Apr 10, 12:54 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 51 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2001Every severe thunderstorm warning 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.