Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 56, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2011, 3:32 PM CDT for Jefferson County, Saint Louis County, Missouri. It was in force for 43 min. 12 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 15, 2011, 3:32 PM CDT (20:32 UTC)
- Expired
- Apr 15, 2011, 4:15 PM CDT
- In force
- 43 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 25 km from the middle of the area, began a volume at 20:31 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 15, 3:42 PM CDT | HAIL 0.25 | Cedar Hill, MO | |
| Apr 15, 3:52 PM CDT | HAIL 0.75 | House Springs, MO | |
| Apr 15, 3:54 PM CDT | HAIL 0.25 | Fenton, MO | |
| Apr 15, 3:56 PM CDT | HAIL 1 | High Ridge, MO | |
| Apr 15, 3:58 PM CDT | HAIL 0.25 | Ballwin, MO | |
| Apr 15, 3:58 PM CDT | HAIL 0.25 | Sunset Hills, MO | |
| Apr 15, 3:58 PM CDT | HAIL 0.88 | Manchester, MO | |
| Apr 15, 4:01 PM CDT | HAIL 0.25 | Fenton, MO | |
| Apr 15, 4:04 PM CDT | HAIL 0.25 | Chesterfield, MO | LADUE AND OLIVE BLVD. |
| Apr 15, 4:05 PM CDT | HAIL 0.5 | Chesterfield, MO | |
| Apr 15, 4:06 PM CDT | HAIL 0.25 | Valley Park, MO | |
| Apr 15, 4:19 PM CDT | HAIL 0.25 | Sunset Hills, MO | 3 TO 4 MINUTES OF PEA SIZE HAIL IN SUNSET HILLS |
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 15, 12:47 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.5 hours before the alert went out and 253 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
- 1776 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
396 WUUS53 KLSX 152032 SVRLSX MOC099-189-152115- /O.NEW.KLSX.SV.W.0056.110415T2032Z-110415T2115Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 332 PM CDT FRI APR 15 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 415 PM CDT * AT 331 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 DITTMER...OR NEAR CEDAR HILL...AND MOVING NORTHEAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... CEDAR HILL...BYRNES MILL...EUREKA...HIGH RIDGE...MURPHY... ELLISVILLE...FENTON...VALLEY PARK...BALLWIN...SUNSET HILLS... CLARKSON VALLEY...MANCHESTER...HOUSE SPRINGS...SCOTSDALE...OTTO... PARKDALE AND PEERLESS PARK. 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 3869 9062 3851 9037 3823 9063 3830 9076 TIME...MOT...LOC 2033Z 211DEG 28KT 3836 9067 WIND...HAIL 60MPH 1.00IN $$ GLASS
2 follow-up statements
707 WWUS53 KLSX 152054 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 354 PM CDT FRI APR 15 2011 MOC099-189-152115- /O.CON.KLSX.SV.W.0056.000000T0000Z-110415T2115Z/ JEFFERSON MO-ST. LOUIS MO- 354 PM CDT FRI APR 15 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST. LOUIS AND NORTH CENTRAL JEFFERSON COUNTIES UNTIL 415 PM CDT... AT 351 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR HOUSE SPRINGS...OR NEAR BYRNES MILL...MOVING NORTHEAST AT 30 MPH. IN ADDITION...AT 352 PM PENNY SIZE HAIL WAS REPORTED IN HOUSE SPRINGS WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... EUREKA...HIGH RIDGE...MURPHY...ELLISVILLE...FENTON...VALLEY PARK... BALLWIN...CLARKSON VALLEY...SUNSET HILLS...MANCHESTER... CHESTERFIELD...PARKDALE AND PEERLESS PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 3833 9054 3846 9069 3869 9062 3851 9037 TIME...MOT...LOC 2054Z 215DEG 26KT 3843 9054 WIND...HAIL 60MPH 1.00IN $$ GLASS
290 WWUS53 KLSX 152117 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 417 PM CDT FRI APR 15 2011 MOC099-189-152127- /O.EXP.KLSX.SV.W.0056.000000T0000Z-110415T2115Z/ JEFFERSON MO-ST. LOUIS MO- 417 PM CDT FRI APR 15 2011 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ST. LOUIS AND NORTH CENTRAL JEFFERSON COUNTIES HAS EXPIRED... 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 3833 9054 3846 9069 3869 9062 3851 9037 TIME...MOT...LOC 2054Z 215DEG 26KT 3843 9054 $$ GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 1:09 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Pike | 51 min |
| Apr 15, 1:53 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 35 min |
| Apr 15, 2:00 PM CDT | Severe Thunderstorm Warning | LSX | Lewis, Marion, Ralls | 45 min |
| Apr 15, 2:20 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Charles, Warren | 40 min |
| Apr 15, 2:23 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls | 22 min |
| Apr 15, 2:52 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls | 53 min |
| Apr 15, 2:54 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Lincoln, Pike, Saint Charles, Saint Louis and 1 more | 51 min |
| Apr 15, 3:52 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Francois | 38 min |
| Apr 15, 4:03 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 42 min |
| Apr 15, 4:21 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson | 39 min |
| Apr 15, 4:43 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 47 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.