Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 504, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Nov 20, 2011, 10:53 PM CST for Jefferson County, Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 19 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
- Nov 20, 2011, 10:53 PM CST (04:53 UTC)
- Expired
- Nov 20, 2011, 11:12 PM CST
- In force
- 19 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 72 km from the middle of the area, began a volume at 04:53 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 |
|---|---|---|---|
| Nov 20, 11:09 PM CST | HAIL 1 | 5 E Olympian Village, MO | QUARTER SIZE HAIL NEAR I-55 AND HIGHWAY TT |
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 00:00Z, 4.9 hours before the alert went out and 274 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
- 1095 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -104 m²/s²
- 0-3 km storm-relative helicity
- 191 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
755
WUUS53 KLSX 210453
SVRLSX
MOC099-186-187-210545-
/O.NEW.KLSX.SV.W.0504.111121T0453Z-111121T0545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1053 PM CST SUN NOV 20 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
NORTHWESTERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
NORTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 1145 PM CST
* AT 1049 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED 8 MILES NORTH OF BONNE TERRE...AND MOVING
NORTHEAST AT 45 MPH.
* LOCATIONS IMPACTED INCLUDE...
OLYMPIAN VILLAGE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.
&&
LAT...LON 3793 9056 3800 9063 3821 9035 3820 9034
3819 9033 3818 9030 3815 9027 3811 9024
3809 9021 3808 9021
TIME...MOT...LOC 0454Z 233DEG 37KT 3806 9045
WIND...HAIL <50MPH 1.00IN
$$
CVKING2 follow-up statements
305
WWUS53 KLSX 210504
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1104 PM CST SUN NOV 20 2011
MOC187-210514-
/O.CAN.KLSX.SV.W.0504.000000T0000Z-111121T0545Z/
ST. FRANCOIS MO-
1104 PM CST SUN NOV 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. FRANCOIS COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3801 9037 3809 9046 3819 9033 3818 9032
3817 9029 3811 9024 3809 9021
TIME...MOT...LOC 0504Z 238DEG 44KT 3813 9030
$$
MOC099-186-210545-
/O.CON.KLSX.SV.W.0504.000000T0000Z-111121T0545Z/
JEFFERSON MO-STE. GENEVIEVE MO-
1104 PM CST SUN NOV 20 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
STE. GENEVIEVE AND SOUTHEASTERN JEFFERSON COUNTIES UNTIL 1145 PM
CST...
AT 1057 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED 5 MILES SOUTHEAST OF OLYMPIAN VILLAGE...OR 10 MILES
SOUTH OF FESTUS...MOVING NORTHEAST AT 50 MPH.
LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF EXTREME NORTHERN STE. GENEVIEVE AND EXTREME
SOUTHEASTERN JEFFERSON COUNTIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.
&&
LAT...LON 3801 9037 3809 9046 3819 9033 3818 9032
3817 9029 3811 9024 3809 9021
TIME...MOT...LOC 0504Z 238DEG 44KT 3813 9030
WIND...HAIL <50MPH 1.00IN
$$
CVKING660
WWUS53 KLSX 210512
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1112 PM CST SUN NOV 20 2011
MOC099-186-210523-
/O.CAN.KLSX.SV.W.0504.000000T0000Z-111121T0545Z/
JEFFERSON MO-STE. GENEVIEVE MO-
1112 PM CST SUN NOV 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STE. GENEVIEVE
AND SOUTHEASTERN JEFFERSON COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.
LAT...LON 3801 9037 3809 9046 3819 9033 3818 9032
3817 9029 3811 9024 3809 9021
TIME...MOT...LOC 0513Z 244DEG 46KT 3817 9016
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 21, 3:22 AM CST | Flash Flood Watch | LSX | Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more | 24 hr |
Nearby
Severe Thunderstorm Warnings in Missouri, 2011Every severe thunderstorm warning in 2011
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.