Alert archive / Illinois / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 3, 2018, 3:21 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 3:21 PM CDT (20:21 UTC)
- Expired
- Apr 3, 2018, 4:00 PM CDT
- In force
- 39 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 83 km from the middle of the area, began a volume at 20:22 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.
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 3, 1:33 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 238 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
- 549 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 317 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
236
WUUS53 KLSX 032021
SVRLSX
ILC133-157-163-032100-
/O.NEW.KLSX.SV.W.0009.180403T2021Z-180403T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
321 PM CDT TUE APR 3 2018
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southeastern Monroe County in southwestern Illinois...
North central Randolph County in southwestern Illinois...
Southeastern St. Clair County in southwestern Illinois...
* Until 400 PM CDT.
* At 321 PM CDT, a severe thunderstorm was located near New Design,
moving northeast at 50 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...
Freeburg, Red Bud, New Athens, Marissa, Baldwin, New Design, St.
Libory, Lenzburg, Hecker, Fayetteville and Burksville.
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.
&&
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3819 8971 3816 9019 3826 9023 3851 8971
TIME...MOT...LOC 2021Z 244DEG 43KT 3823 9016
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
$$
TES3 follow-up statements
842
WWUS53 KLSX 032034
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
334 PM CDT TUE APR 3 2018
ILC157-032044-
/O.CAN.KLSX.SV.W.0009.000000T0000Z-180403T2100Z/
Randolph IL-
334 PM CDT TUE APR 3 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL RANDOLPH COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3822 8971 3822 8998 3823 9002 3834 9004
3851 8971
TIME...MOT...LOC 2034Z 244DEG 50KT 3830 8996
$$
ILC133-163-032100-
/O.CON.KLSX.SV.W.0009.000000T0000Z-180403T2100Z/
Monroe IL-St. Clair IL-
334 PM CDT TUE APR 3 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR EAST CENTRAL MONROE AND SOUTHEASTERN ST. CLAIR COUNTIES...
At 334 PM CDT, a severe thunderstorm was located near New Athens,
moving northeast at 55 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...
Freeburg, New Athens, Marissa, St. Libory, Lenzburg, Hecker and
Fayetteville.
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.
&&
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3822 8971 3822 8998 3823 9002 3834 9004
3851 8971
TIME...MOT...LOC 2034Z 244DEG 50KT 3830 8996
HAIL...1.00IN
WIND...60MPH
$$
TES625
WWUS53 KLSX 032044
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
344 PM CDT TUE APR 3 2018
ILC133-032053-
/O.CAN.KLSX.SV.W.0009.000000T0000Z-180403T2100Z/
Monroe IL-
344 PM CDT TUE APR 3 2018
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3822 8971 3822 8988 3838 8989 3851 8971
TIME...MOT...LOC 2043Z 244DEG 43KT 3835 8983
$$
ILC163-032100-
/O.CON.KLSX.SV.W.0009.000000T0000Z-180403T2100Z/
St. Clair IL-
344 PM CDT TUE APR 3 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN ST. CLAIR COUNTY...
At 343 PM CDT, a severe thunderstorm was located near New Athens,
moving northeast at 50 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
New Athens, Marissa, St. Libory, Lenzburg and Fayetteville.
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.
&&
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3822 8971 3822 8988 3838 8989 3851 8971
TIME...MOT...LOC 2043Z 244DEG 43KT 3835 8983
HAIL...0.88IN
WIND...60MPH
$$
TES720
WWUS53 KLSX 032050
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
350 PM CDT TUE APR 3 2018
ILC163-032100-
/O.EXP.KLSX.SV.W.0009.000000T0000Z-180403T2100Z/
St. Clair IL-
350 PM CDT TUE APR 3 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
WILL EXPIRE AT 400 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire. However gusty winds
are still possible with this thunderstorm.
A tornado watch remains in effect until 800 PM CDT for southwestern
Illinois.
LAT...LON 3822 8971 3822 8988 3838 8989 3851 8971
TIME...MOT...LOC 2050Z 244DEG 43KT 3838 8975
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 7:46 PM CDT | Special Weather Statement | LSX | Clinton, Marion | 44 min |
| Apr 2, 11:13 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 32 min |
| Apr 2, 11:55 PM CDT | Special Weather Statement | LSX | Clinton | 50 min |
| Apr 3, 12:38 AM CDT | Special Weather Statement | LSX | Madison | 52 min |
| Apr 3, 8:23 AM CDT | River Flood Warning | LSX | Fayette | 6 days |
| Apr 3, 10:08 AM CDT | Flash Flood Warning | LSX | Fayette | 6 hr |
| Apr 3, 10:16 AM CDT | Special Weather Statement | LSX | Fayette | 14 min |
| Apr 3, 3:26 PM CDT | Severe Thunderstorm Warning | LSX | Randolph | 49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.