Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 111, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 2011, 7:18 PM CDT for Franklin County, Jefferson County, Saint Louis County, Missouri. It was in force for 42 min. 8 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 19, 2011, 7:18 PM CDT (00:18 UTC)
- Expired
- Apr 19, 2011, 8:00 PM CDT
- In force
- 42 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, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 33 km from the middle of the area, began a volume at 00:19 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 19, 7:23 PM CDT | HAIL 1.75 | 3 S Robertsville, MO | |
| Apr 19, 7:33 PM CDT | HAIL 0.25 | Lonedell, MO | AT HH AND HWY 30 |
| Apr 19, 7:39 PM CDT | HAIL 0.7 | High Ridge, MO | |
| Apr 19, 7:43 PM CDT | HAIL 0.75 | Fenton, MO | |
| Apr 19, 7:43 PM CDT | HAIL 1 | Sunset Hills, MO | |
| Apr 19, 7:50 PM CDT | TSTM WND DMG | 1 Ese Fenton, MO | MOBILE HOME SIDING TORN OFF |
| Apr 19, 7:50 PM CDT | HAIL 1 | Sunset Hills, MO | |
| Apr 19, 7:50 PM CDT | HAIL 1.25 | 1 Ese Fenton, MO | MOBILE HOME SIDING TORN OFF |
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 19, 1:00 PM CDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.3 hours before the alert went out and 259 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
- 2409 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 370 m²/s²
- 0-3 km storm-relative helicity
- 547 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 24.4
The text
As transmitted, in the capitals the NWS used until 2016.
053 WUUS53 KLSX 200018 SVRLSX MOC071-099-189-200100- /O.NEW.KLSX.SV.W.0111.110420T0018Z-110420T0100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 718 PM CDT TUE APR 19 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI... NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... SOUTHWESTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 800 PM CDT * AT 715 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 LONEDELL...OR 8 MILES SOUTH OF VILLA RIDGE...AND MOVING NORTHEAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... PACIFIC...CEDAR HILL...EUREKA...BYRNES MILL...ANTONIA...HIGH RIDGE...PEVELY...BARNHART...MURPHY...FENTON...SUNSET HILLS... CRESTWOOD...DITTMER...HOUSE SPRINGS...ROBERTSVILLE...OERMANN... CATAWISSA...MORSE MILL...MAPAVILLE AND SCOTSDALE. 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 3858 9038 3826 9038 3821 9082 3841 9101 TIME...MOT...LOC 0018Z 239DEG 26KT 3838 9081 WIND...HAIL 60MPH 1.00IN $$ GLASS
1 follow-up statement
530 WWUS53 KLSX 200059 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 759 PM CDT TUE APR 19 2011 MOC071-099-189-200109- /O.EXP.KLSX.SV.W.0111.000000T0000Z-110420T0100Z/ JEFFERSON MO-FRANKLIN MO-ST. LOUIS MO- 759 PM CDT TUE APR 19 2011 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ST. LOUIS... SOUTHEASTERN FRANKLIN AND NORTHERN JEFFERSON COUNTIES WILL EXPIRE AT 800 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM. LAT...LON 3858 9038 3826 9038 3821 9082 3841 9101 TIME...MOT...LOC 0059Z 239DEG 26KT 3853 9049 $$ GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:03 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Washington | 42 min |
| Apr 19, 7:05 PM CDT | Areal Flood Advisory | LSX | Saint Louis, City of Saint Louis | 5 hr |
| Apr 19, 7:17 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison | 28 min |
| Apr 19, 7:25 PM CDT | Tornado Warning | LSX | Iron, Madison, Saint Francois | 40 min |
| Apr 19, 7:29 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 46 min |
| Apr 19, 7:30 PM CDT | Tornado Warning | LSX | Saint Louis, City of Saint Louis | 45 min |
| Apr 19, 7:34 PM CDT | Tornado Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 41 min |
| Apr 19, 7:37 PM CDT | Tornado Warning | LSX | Jefferson, Saint Louis | 36 min |
| Apr 19, 7:39 PM CDT | Tornado Warning | LSX | Franklin, Jefferson, Washington | 33 min |
| Apr 19, 7:48 PM CDT | Tornado Warning | LSX | Madison | 27 min |
| Apr 19, 7:54 PM CDT | Tornado Warning | LSX | Sainte Genevieve | 36 min |
| Apr 19, 9:37 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 21 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.