Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 42, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 9:36 PM CDT for 4 counties in Missouri; Pike County, Illinois. It was in force for 30 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
- Apr 10, 2011, 9:36 PM CDT (02:36 UTC)
- Expired
- Apr 10, 2011, 10:06 PM CDT
- In force
- 30 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Pike County, IL, Audrain County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO
The radar
The St Louis radar (KLSX), 116 km from the middle of the area, began a volume at 02:39 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 |
|---|---|---|---|
| Apr 10, 10:02 PM CDT | TSTM WND GST 45 | Saverton, MO | PEA SIZE HAIL ALSO FALLING |
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 |
|---|---|---|---|
| Apr 10, 6:05 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 231 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
- 1138 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1662 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.7
The text
As transmitted, in the capitals the NWS used until 2016.
725
WUUS53 KLSX 110236
SVRLSX
ILC149-MOC007-137-163-173-110315-
/O.NEW.KLSX.SV.W.0042.110411T0236Z-110411T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
936 PM CDT SUN APR 10 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN PIKE COUNTY IN WEST CENTRAL ILLINOIS...
NORTHEASTERN AUDRAIN COUNTY IN CENTRAL MISSOURI...
SOUTHEASTERN MONROE COUNTY IN NORTHEAST MISSOURI...
NORTHERN PIKE COUNTY IN NORTHEAST MISSOURI...
RALLS COUNTY IN NORTHEAST MISSOURI...
* UNTIL 1015 PM CDT
* AT 931 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
SANTA FE...AND MOVING NORTHEAST AT 60 MPH.
* LOCATIONS IMPACTED INCLUDE...
VANDALIA...LOUISIANA...FARBER...PERRY...CENTER...CURRYVILLE...
SPENCERBURG...NEW LONDON...FRANKFORD...PIKE...ATLAS...PLEASANT
HILL...BARRY...ILASCO...SAVERTON...ASHBURN...HULL...KINDERHOOK...
NEW CANTON AND ROCKPORT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3976 9095 3943 9082 3920 9181 3944 9192
3969 9137 3969 9132 3970 9133 3971 9133
3976 9122 3977 9119
TIME...MOT...LOC 0236Z 242DEG 63KT 3937 9168
WIND...HAIL 60MPH 1.00IN
$$
KANOFSKY2 follow-up statements
159
WWUS53 KLSX 110245
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
945 PM CDT SUN APR 10 2011
MOC007-137-110255-
/O.CAN.KLSX.SV.W.0042.000000T0000Z-110411T0315Z/
AUDRAIN MO-MONROE MO-
945 PM CDT SUN APR 10 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE AND
NORTHEASTERN AUDRAIN COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3976 9095 3943 9082 3929 9144 3932 9144
3932 9167 3933 9171 3934 9173 3953 9172
3969 9137 3969 9132 3971 9133 3976 9121
TIME...MOT...LOC 0245Z 242DEG 63KT 3944 9150
$$
ILC149-MOC163-173-110315-
/O.CON.KLSX.SV.W.0042.000000T0000Z-110411T0315Z/
PIKE IL-PIKE MO-RALLS MO-
945 PM CDT SUN APR 10 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN PIKE
COUNTY IN WEST CENTRAL ILLINOIS...AND RALLS AND NORTHERN PIKE
COUNTIES IN NORTHEAST MISSOURI UNTIL 1015 PM CDT...
AT 943 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES
SOUTH OF CENTER...OR 8 MILES NORTH OF VANDALIA...MOVING NORTHEAST AT
60 MPH.
LOCATIONS IMPACTED INCLUDE...
LOUISIANA...CURRYVILLE...SPAULDING...SPENCERBURG...NEW LONDON...
FRANKFORD...PIKE...ATLAS...PLEASANT HILL...BARRY...ILASCO...
SAVERTON...ASHBURN...HULL...KINDERHOOK...NEW CANTON...ROCKPORT...EL
DARA...SUMMER HILL AND NEW HARTFORD.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3976 9095 3943 9082 3929 9144 3932 9144
3932 9167 3933 9171 3934 9173 3953 9172
3969 9137 3969 9132 3971 9133 3976 9121
TIME...MOT...LOC 0245Z 242DEG 63KT 3944 9150
WIND...HAIL 60MPH 1.00IN
$$
KANOFSKY669
WWUS53 KLSX 110306
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1006 PM CDT SUN APR 10 2011
ILC149-MOC163-173-110315-
/O.CAN.KLSX.SV.W.0042.000000T0000Z-110411T0315Z/
PIKE IL-PIKE MO-RALLS MO-
1006 PM CDT SUN APR 10 2011
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN PIKE COUNTY IN WEST
CENTRAL ILLINOIS...AND RALLS AND NORTHERN PIKE COUNTIES IN NORTHEAST
MISSOURI IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 1 AM.
LAT...LON 3976 9095 3943 9082 3929 9144 3932 9144
3932 9167 3933 9171 3934 9173 3953 9172
3969 9137 3969 9132 3971 9133 3976 9121
TIME...MOT...LOC 0305Z 242DEG 63KT 3960 9110
$$
KANOFSKYThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 8:33 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls | 42 min |
| Apr 10, 8:41 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Moniteau | 34 min |
| Apr 10, 9:06 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Callaway, Monroe, Ralls | 39 min |
| Apr 10, 9:48 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Montgomery, Pike, Warren | 42 min |
| Apr 10, 10:12 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Pike, Ralls | 34 min |
| Apr 10, 10:16 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Osage, Warren | 44 min |
| Apr 10, 10:57 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Lincoln, Saint Charles, Warren | 48 min |
| Apr 10, 11:38 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade | 36 min |
| Apr 10, 11:35 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin, Madison, Montgomery | 40 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2011Severe Thunderstorm Warnings in Illinois, 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.