Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 142, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 29, 2012, 10:13 PM CDT for Knox County, Lewis County, Missouri. It was in force for 47 min. 2 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
- Apr 29, 2012, 10:13 PM CDT (03:13 UTC)
- Expired
- Apr 29, 2012, 11:00 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Knox County, MO, Lewis County, MO
The radar
The Quad Cities radar (KDVN), 184 km from the middle of the area, began a volume at 03:14 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 29, 10:33 PM CDT | HAIL 0.25 | La Belle, MO | |
| Apr 29, 10:33 PM CDT | HAIL 1 | La Belle, MO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 3.2 hours before the alert went out and 189 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
- 437 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 353 m²/s²
- 0-3 km storm-relative helicity
- 432 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
034
WUUS53 KLSX 300313
SVRLSX
MOC103-111-300400-
/O.NEW.KLSX.SV.W.0142.120430T0313Z-120430T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1013 PM CDT SUN APR 29 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN KNOX COUNTY IN NORTHEAST MISSOURI...
LEWIS COUNTY IN NORTHEAST MISSOURI...
* UNTIL 1100 PM CDT
* AT 1011 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LA BELLE...
AND MOVING NORTHEAST AT 45 MPH.
HAZARD...QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
* LOCATIONS IMPACTED INCLUDE...
CANTON...LEWISTOWN AND MONTICELLO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.
&&
LAT...LON 4026 9177 4025 9150 4025 9149 4020 9150
4019 9151 4011 9151 4005 9149 3996 9198
4012 9210 4026 9179
TIME...MOT...LOC 0314Z 240DEG 39KT 4010 9190
HAIL...1.00IN
WIND...<50 MPH
$$
BRITT2 follow-up statements
266
WWUS53 KLSX 300325
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1025 PM CDT SUN APR 29 2012
MOC103-300334-
/O.CAN.KLSX.SV.W.0142.000000T0000Z-120430T0400Z/
KNOX MO-
1025 PM CDT SUN APR 29 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN KNOX COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4025 9149 4020 9150 4019 9151 4011 9151
4005 9149 4003 9194 4016 9195 4026 9179
TIME...MOT...LOC 0324Z 240DEG 39KT 4015 9178
$$
MOC111-300400-
/O.CON.KLSX.SV.W.0142.000000T0000Z-120430T0400Z/
LEWIS MO-
1025 PM CDT SUN APR 29 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN LEWIS
COUNTY UNTIL 1100 PM CDT...
AT 1021 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LEWISTOWN...
AND MOVING NORTHEAST AT 45 MPH.
HAZARD...QUARTER SIZE HAIL.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.
LOCATIONS IMPACTED INCLUDE...
CANTON AND MONTICELLO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.
&&
LAT...LON 4025 9149 4020 9150 4019 9151 4011 9151
4005 9149 4003 9194 4016 9195 4026 9179
TIME...MOT...LOC 0324Z 240DEG 39KT 4015 9178
HAIL...1.00IN
WIND...<50 MPH
$$
BRITT419
WWUS53 KLSX 300352
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1052 PM CDT SUN APR 29 2012
MOC111-300402-
/O.EXP.KLSX.SV.W.0142.000000T0000Z-120430T0400Z/
LEWIS MO-
1052 PM CDT SUN APR 29 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LEWIS COUNTY WILL
EXPIRE AT 1100 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
LAT...LON 4025 9149 4020 9150 4019 9151 4011 9151
4005 9149 4003 9194 4016 9195 4026 9179
TIME...MOT...LOC 0352Z 240DEG 39KT 4030 9144
$$
BRITTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 8:11 PM CDT | River Flood Warning | LSX | Cole | 45 hr |
| Apr 29, 10:10 PM CDT | River Flood Warning | LSX | Lincoln | 11 hr |
| Apr 29, 10:43 PM CDT | Flash Flood Warning | LSX | Audrain, Boone | 8 hr |
| Apr 29, 10:45 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Monroe, Ralls | 45 min |
| Apr 30, 12:02 AM CDT | Flash Flood Warning | LSX | Boone | 7 hr |
| Apr 30, 2:40 AM CDT | Flash Flood Warning | LSX | Callaway | 6 hr |
| Apr 30, 6:29 AM CDT | Flash Flood Warning | LSX | Audrain, Boone | 5 hr |
| Apr 30, 8:31 AM CDT | Areal Flood Warning | LSX | Callaway | 6 hr |
| Apr 30, 10:48 AM CDT | Areal Flood Warning | LSX | Boone | 6 hr |
| Apr 30, 4:51 PM CDT | Areal Flood Warning | LSX | Boone | 6 hr |
| Apr 30, 5:27 PM CDT | River Flood Warning | LSX | Lincoln | 17 hr |
Nearby
Severe Thunderstorm Warnings in Missouri, 2012Every severe thunderstorm warning in 2012
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.