Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 27, 2021, 5:18 PM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 42 min. 3 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
- Mar 27, 2021, 5:18 PM CDT (22:18 UTC)
- Expired
- Mar 27, 2021, 6:00 PM CDT
- In force
- 42 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Macoupin County, IL, Montgomery County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 27, 5:24 PM CDT | HAIL 0.75 | Virden, IL | REPORT FROM MPING: DIME (0.75 IN.). |
| Mar 27, 5:30 PM CDT | HAIL 1 | Virden, IL | CORRECTS PREVIOUS HAIL REPORT FROM VIRDEN. VIA BROADCAST MEDIA ON TWITTER. |
| Mar 27, 5:30 PM CDT | HAIL 1 | Virden, IL | VIA BROADCAST MEDIA ON TWITTER. |
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 |
|---|---|---|---|
| Mar 27, 4:44 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 130 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
- 1078 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- 369 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
379
WUUS53 KLSX 272218
SVRLSX
ILC117-135-272300-
/O.NEW.KLSX.SV.W.0011.210327T2218Z-210327T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
518 PM CDT Sat Mar 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Northeastern Macoupin County in southwestern Illinois...
Northwestern Montgomery County in south central Illinois...
* Until 600 PM CDT.
* At 518 PM CDT, a severe thunderstorm was located near Girard,
moving east 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...
Virden, Girard, White Oak, Farmersville, Palmyra, Nilwood and
Modesto.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3937 8999 3952 8999 3952 8953 3940 8953
TIME...MOT...LOC 2218Z 256DEG 45KT 3948 8983
HAIL...1.00IN
WIND...60MPH
$$
BRC2 follow-up statements
439
WWUS53 KLSX 272240
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
540 PM CDT Sat Mar 27 2021
ILC117-272250-
/O.CAN.KLSX.SV.W.0011.000000T0000Z-210327T2300Z/
Macoupin IL-
540 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MACOUPIN COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has weakened.
moved out of the warned area. Therefore, the warning has been
cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois.
LAT...LON 3939 8970 3952 8970 3952 8953 3940 8953
TIME...MOT...LOC 2240Z 256DEG 45KT 3955 8948
$$
ILC135-272300-
/O.CON.KLSX.SV.W.0011.000000T0000Z-210327T2300Z/
Montgomery IL-
540 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN MONTGOMERY COUNTY...
At 540 PM CDT, a severe thunderstorm was located near Bulpitt, moving
east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
White Oak and Farmersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3939 8970 3952 8970 3952 8953 3940 8953
TIME...MOT...LOC 2240Z 256DEG 45KT 3955 8948
HAIL...1.00IN
WIND...60MPH
$$
BRC235
WWUS53 KLSX 272252
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
552 PM CDT Sat Mar 27 2021
ILC135-272302-
/O.EXP.KLSX.SV.W.0011.000000T0000Z-210327T2300Z/
Montgomery IL-
552 PM CDT Sat Mar 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONTGOMERY COUNTY
WILL EXPIRE AT 600 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central and southwestern Illinois.
LAT...LON 3939 8970 3952 8970 3952 8953 3940 8953
TIME...MOT...LOC 2252Z 256DEG 45KT 3958 8932
$$
BRCThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 4:23 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Pike | 52 min |
| Mar 27, 4:47 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 43 min |
| Mar 27, 4:52 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Madison | 38 min |
| Mar 27, 5:26 PM CDT | Severe Thunderstorm Warning | LSX | Madison | 38 min |
| Mar 27, 6:56 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison, Saint Clair | 49 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2021Every severe thunderstorm warning in 2021
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.