Alert archive / Illinois / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 21, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 6, 2018, 6:41 PM CDT for Madison County, Illinois. It was in force for 37 min. 1 report 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
- May 6, 2018, 6:41 PM CDT (23:41 UTC)
- Expired
- May 6, 2018, 7:18 PM CDT
- In force
- 37 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Madison County, IL
The radar
The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 23:42 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 |
|---|---|---|---|
| May 6, 7:05 PM CDT | HAIL 0.75 | 1 Nne Alhambra, IL |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.7 hours before the alert went out and 172 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2694 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
214
WUUS53 KLSX 062341
SVRLSX
ILC119-070030-
/O.NEW.KLSX.SV.W.0021.180506T2341Z-180507T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
641 PM CDT SUN MAY 6 2018
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Eastern Madison County in southwestern Illinois...
* Until 730 PM CDT.
* At 641 PM CDT, a severe thunderstorm was located over Livingston,
moving south at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Highland, St. Jacob, Marine, Livingston, Alhambra, Pierron,
Grantfork, Williamson and Kaufman.
This includes the following highways...
Interstate 70 in Illinois between exits 21 and 30.
Interstate 55 in Illinois between exits 33 and 37.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in St Louis.
&&
LAT...LON 3870 8985 3899 8982 3900 8977 3900 8970
3891 8964 3888 8964 3887 8961 3886 8960
3875 8960
TIME...MOT...LOC 2341Z 346DEG 11KT 3897 8976
HAIL...1.00IN
WIND...60MPH
$$
Gosselin2 follow-up statements
001
WWUS53 KLSX 070013
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
713 PM CDT SUN MAY 6 2018
ILC119-070030-
/O.CON.KLSX.SV.W.0021.000000T0000Z-180507T0030Z/
Madison IL-
713 PM CDT SUN MAY 6 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR SOUTHEASTERN MADISON COUNTY IN SOUTHWESTERN ILLINOIS...
At 713 PM CDT, a severe thunderstorm was located near Highland,
moving southeast at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Highland, St. Jacob, Marine, Pierron and Grantfork.
This includes Interstate 70 in Illinois between exits 21 and 30.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.
&&
LAT...LON 3870 8985 3885 8983 3886 8974 3887 8967
3888 8964 3887 8961 3886 8960 3875 8960
TIME...MOT...LOC 0013Z 337DEG 19KT 3882 8968
HAIL...1.00IN
WIND...60MPH
$$
Gosselin012
WWUS53 KLSX 070018
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
718 PM CDT SUN MAY 6 2018
ILC119-070028-
/O.CAN.KLSX.SV.W.0021.000000T0000Z-180507T0030Z/
Madison IL-
718 PM CDT SUN MAY 6 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 3870 8985 3885 8983 3886 8974 3887 8967
3888 8964 3887 8961 3886 8960 3875 8960
TIME...MOT...LOC 0015Z 346DEG 11KT 3880 8967
$$
GosselinThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 11:37 AM CDT | River Flood Warning | LSX | Jersey | 20 days |
| May 6, 5:26 PM CDT | Special Weather Statement | LSX | Montgomery | 49 min |
| May 6, 5:34 PM CDT | Special Weather Statement | LSX | Montgomery | 41 min |
| May 6, 5:59 PM CDT | Special Weather Statement | LSX | Montgomery | 46 min |
| May 6, 6:38 PM CDT | Special Weather Statement | LSX | Madison | 52 min |
| May 6, 6:53 PM CDT | Special Weather Statement | LSX | Brown | 52 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2018Every severe thunderstorm warning in 2018
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.