Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 55, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2021, 2:46 PM CDT for Jefferson County, Sainte Genevieve County, Missouri; Monroe County, Randolph County, Illinois. It was in force for 29 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
- May 27, 2021, 2:46 PM CDT (19:46 UTC)
- Expired
- May 27, 2021, 3:15 PM CDT
- In force
- 29 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Randolph County, IL, Jefferson County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 19:47 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 27, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 251 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
- 1679 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
872
WUUS53 KLSX 271946
SVRLSX
ILC133-157-MOC099-186-272015-
/O.NEW.KLSX.SV.W.0055.210527T1946Z-210527T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
246 PM CDT Thu May 27 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Monroe County in southwestern Illinois...
Northwestern Randolph County in southwestern Illinois...
Southeastern Jefferson County in east central Missouri...
Northeastern Ste. Genevieve County in southeastern Missouri...
* Until 315 PM CDT.
* At 246 PM CDT, a severe thunderstorm was located over Festus,
moving east at 45 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.
* This severe thunderstorm will be near...
New Design around 305 PM CDT.
Other locations in the path of this severe thunderstorm include Red
Bud and Evansville.
This includes Interstate 55 in Missouri between exits 162 and 180.
This also includes Gov. Dunklin's Grave Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3797 8995 3811 9053 3835 9047 3827 8992
3826 8991 3825 8992 3823 8990 3822 8990
3822 8986
TIME...MOT...LOC 1946Z 279DEG 40KT 3821 9042
HAIL...1.00IN
WIND...60MPH
$$
Carney1 follow-up statement
042
WWUS53 KLSX 272012 RRA
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
312 PM CDT Thu May 27 2021
ILC133-157-MOC099-186-272022-
/O.EXP.KLSX.SV.W.0055.000000T0000Z-210527T2015Z/
Monroe IL-Randolph IL-Jefferson MO-Ste. Genevieve MO-
312 PM CDT Thu May 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR MONROE...NORTHWESTERN
RANDOLPH...SOUTHEASTERN JEFFERSON AND NORTHEASTERN STE. GENEVIEVE
COUNTIES WILL EXPIRE AT 315 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
southwestern Illinois...and southeastern and east central Missouri.
LAT...LON 3797 8995 3811 9053 3835 9047 3827 8992
3826 8991 3825 8992 3823 8990 3822 8990
3822 8986
TIME...MOT...LOC 2012Z 279DEG 40KT 3816 9005
$$
CarneyThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 11:13 AM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 47 min |
| May 27, 11:50 AM CDT | Severe Thunderstorm Warning | LSX | Franklin, Lincoln, Saint Charles, Saint Louis, Warren, City of Saint Louis | 55 min |
| May 27, 12:39 PM CDT | Areal Flood Advisory | LSX | Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
| May 27, 1:09 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Louis | 51 min |
| May 27, 1:24 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Gasconade | 51 min |
| May 27, 1:51 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Washington | 39 min |
| May 27, 11:32 AM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 43 min |
| May 27, 12:07 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin, Montgomery | 38 min |
| May 27, 12:26 PM CDT | Tornado Warning | LSX | Macoupin, Madison | 34 min |
| May 27, 12:56 PM CDT | Tornado Warning | LSX | Bond, Macoupin, Madison, Montgomery | 28 min |
| May 27, 2:16 PM CDT | Areal Flood Advisory | LSX | Bond, Fayette | 3 hr |
| May 27, 2:31 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Fayette, Marion | 44 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2021Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.