Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 486, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 7, 2011, 7:25 PM CDT for Franklin County, Jefferson County, Washington County, Missouri. It was in force for 50 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
- Aug 7, 2011, 7:25 PM CDT (00:25 UTC)
- Expired
- Aug 7, 2011, 8:15 PM CDT
- In force
- 50 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Franklin County, MO, Jefferson County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 00:26 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 |
|---|---|---|---|
| Aug 7, 7:48 PM CDT | TSTM WND DMG | Richwoods, MO | PEA SIZED HAIL AND 1.5 INCH TREE LIMBS SNAPPED. |
| Aug 7, 7:48 PM CDT | HAIL 0.25 | Richwoods, MO | PEA SIZED HAIL AND 1.5 INCH TREE LIMBS SNAPPED. |
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 |
|---|---|---|---|
| Aug 7, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.4 hours before the alert went out and 290 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
- 398 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1794 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
696
WUUS53 KLSX 080025
SVRLSX
MOC071-099-221-080115-
/O.NEW.KLSX.SV.W.0486.110808T0025Z-110808T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
725 PM CDT SUN AUG 7 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
SOUTHWESTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
NORTHEASTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 815 PM CDT
* AT 722 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 7 MILES
SOUTH OF PARKWAY...OR 8 MILES SOUTH OF ST. CLAIR...AND MOVING EAST
AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
HILLSBORO...DE SOTO...LONEDELL...RICHWOODS...GRUBVILLE...OERMANN...
FLETCHER...MORSE MILL...VICTORIA AND MAPAVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3802 9061 3803 9062 3807 9062 3807 9064
3801 9064 3817 9106 3836 9099 3830 9045
3800 9061 3801 9063
TIME...MOT...LOC 0026Z 286DEG 26KT 3823 9091
WIND...HAIL 60MPH 1.00IN
$$
CVKING3 follow-up statements
253
WWUS53 KLSX 080039
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
739 PM CDT SUN AUG 7 2011
MOC071-099-221-080115-
/O.CON.KLSX.SV.W.0486.000000T0000Z-110808T0115Z/
FRANKLIN MO-JEFFERSON MO-WASHINGTON MO-
739 PM CDT SUN AUG 7 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON...SOUTHWESTERN JEFFERSON AND SOUTHEASTERN FRANKLIN
COUNTIES UNTIL 815 PM CDT...
AT 735 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
RICHWOODS...OR 13 MILES SOUTHEAST OF ST. CLAIR...MOVING SOUTHEAST AT
40 MPH.
LOCATIONS IMPACTED INCLUDE...
RICHWOODS...HILLSBORO...DE SOTO...FLETCHER AND VICTORIA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3801 9063 3802 9061 3803 9062 3807 9062
3807 9064 3801 9064 3819 9097 3830 9090
3825 9048 3800 9061
TIME...MOT...LOC 0039Z 296DEG 35KT 3819 9078
WIND...HAIL 60MPH 1.00IN
$$
CVKING594
WWUS53 KLSX 080055
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
755 PM CDT SUN AUG 7 2011
MOC071-080105-
/O.CAN.KLSX.SV.W.0486.000000T0000Z-110808T0115Z/
FRANKLIN MO-
755 PM CDT SUN AUG 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3801 9063 3802 9061 3803 9062 3807 9062
3807 9064 3801 9064 3805 9072 3812 9078
3820 9067 3816 9053 3800 9061
TIME...MOT...LOC 0055Z 296DEG 35KT 3812 9060
$$
MOC099-221-080115-
/O.CON.KLSX.SV.W.0486.000000T0000Z-110808T0115Z/
JEFFERSON MO-WASHINGTON MO-
755 PM CDT SUN AUG 7 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON AND SOUTHWESTERN JEFFERSON COUNTIES UNTIL 815 PM CDT...
AT 754 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR DE
SOTO...MOVING SOUTHEAST AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
DE SOTO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3801 9063 3802 9061 3803 9062 3807 9062
3807 9064 3801 9064 3805 9072 3812 9078
3820 9067 3816 9053 3800 9061
TIME...MOT...LOC 0055Z 296DEG 35KT 3812 9060
WIND...HAIL 60MPH 1.00IN
$$
CVKING463
WWUS53 KLSX 080112
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
812 PM CDT SUN AUG 7 2011
MOC099-221-080122-
/O.EXP.KLSX.SV.W.0486.000000T0000Z-110808T0115Z/
JEFFERSON MO-WASHINGTON MO-
812 PM CDT SUN AUG 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON AND
SOUTHWESTERN JEFFERSON COUNTIES WILL EXPIRE AT 815 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
LAT...LON 3801 9063 3802 9061 3803 9062 3807 9062
3807 9064 3801 9064 3805 9072 3812 9078
3820 9067 3816 9053 3800 9061
TIME...MOT...LOC 0112Z 296DEG 35KT 3805 9041
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 7:54 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois, Washington | 18 min |
| Aug 7, 8:28 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 35 min |
| Aug 7, 8:43 PM CDT | Severe Thunderstorm Warning | LSX | Reynolds | 32 min |
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.