Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 27, 2021, 4:47 PM CDT for Greene County, Macoupin County, Illinois. It was in force for 43 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, 4:47 PM CDT (21:47 UTC)
- Expired
- Mar 27, 2021, 5:30 PM CDT
- In force
- 43 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Greene County, IL, Macoupin County, IL
The radar
The St Louis radar (KLSX), 97 km from the middle of the area, began a volume at 21:47 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 |
|---|---|---|---|
| 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, 9.8 hours before the alert went out and 151 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.
384
WUUS53 KLSX 272147
SVRLSX
ILC061-117-272230-
/O.NEW.KLSX.SV.W.0009.210327T2147Z-210327T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
447 PM CDT Sat Mar 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Northern Greene County in southwestern Illinois...
Northern Macoupin County in southwestern Illinois...
* Until 530 PM CDT.
* At 447 PM CDT, a severe thunderstorm was located near White Hall,
moving east at 60 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, White Hall, Carrollton, Girard, Roodhouse, Greenfield,
Palmyra, Athensville, Patterson, Wrights, Eldred, Hillview,
Modesto, Scottville, Belltown, Berdan, Haypress, Barrow and
Walkersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3945 8970 3925 9057 3946 9056 3952 9039
3952 8970
TIME...MOT...LOC 2147Z 248DEG 50KT 3943 9034
HAIL...1.00IN
WIND...60MPH
$$
BRC1 follow-up statement
139
WWUS53 KLSX 272209
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
509 PM CDT Sat Mar 27 2021
ILC061-117-272230-
/O.CON.KLSX.SV.W.0009.000000T0000Z-210327T2230Z/
Greene IL-Macoupin IL-
509 PM CDT Sat Mar 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHEASTERN GREENE AND NORTHERN MACOUPIN COUNTIES...
At 509 PM CDT, a severe thunderstorm was located near Palmyra, moving
east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Virden, Girard, Greenfield, Palmyra, Athensville, Modesto and
Scottville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3945 8970 3933 9023 3952 9033 3952 8970
TIME...MOT...LOC 2209Z 250DEG 48KT 3951 8999
HAIL...1.00IN
WIND...60MPH
$$
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, 4:52 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Madison | 38 min |
| Mar 27, 5:18 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 42 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; radar from the NEXRAD Level II archive.