Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 370, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 21, 2011, 2:07 PM CDT for Jefferson County, Saint Francois County, Washington County, Missouri. It was in force for 53 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
- Jun 21, 2011, 2:07 PM CDT (19:07 UTC)
- Expired
- Jun 21, 2011, 3:00 PM CDT
- In force
- 53 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Jefferson County, MO, Saint Francois County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 19:11 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 |
|---|---|---|---|
| Jun 21, 2:13 PM CDT | HAIL 0.88 | Potosi, MO | ESTIMATED 50MPH WINDS. |
| Jun 21, 2:14 PM CDT | HAIL 0.5 | Potosi, MO | |
| Jun 21, 2:17 PM CDT | HAIL 1 | 3 Sw Potosi, MO | |
| Jun 21, 2:34 PM CDT | TSTM WND GST 60 | Olympian Village, MO | ESTIMATED 50 TO 60 MPH WINDS. |
| Jun 21, 2:34 PM CDT | HAIL 0.25 | Olympian Village, MO | ESTIMATED 50 TO 60 MPH WINDS. |
| Jun 21, 2:40 PM CDT | HAIL 0.25 | De Soto, MO | |
| Jun 21, 2:40 PM CDT | HAIL 0.7 | De Soto, MO | |
| Jun 21, 2:41 PM CDT | HAIL 0.7 | 2 Se Hematite, MO |
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 |
|---|---|---|---|
| Jun 21, 1:22 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.1 hours before the alert went out and 288 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
- 489 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 1353 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -245 m²/s²
- 0-3 km storm-relative helicity
- -164 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -5.5
The text
As transmitted, in the capitals the NWS used until 2016.
487 WUUS53 KLSX 211907 SVRLSX MOC099-187-221-212000- /O.NEW.KLSX.SV.W.0370.110621T1907Z-110621T2000Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 207 PM CDT TUE JUN 21 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI... ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI... EASTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 300 PM CDT * AT 206 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 POTOSI...AND MOVING NORTHEAST AT 45 MPH. * LOCATIONS IMPACTED INCLUDE... DE SOTO...HILLSBORO...CEDAR HILL...MINERAL POINT...OLD MINES... OLYMPIAN VILLAGE...CADET...BLACKWELL...FLETCHER...VALLES MILL... MORSE MILL...VICTORIA...HEMATITE AND MAPAVILLE. 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 3836 9064 3814 9028 3779 9078 3794 9097 TIME...MOT...LOC 1908Z 225DEG 39KT 3796 9079 WIND...HAIL 60MPH 1.00IN $$ PHILLIPSON
2 follow-up statements
081 WWUS53 KLSX 211932 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 232 PM CDT TUE JUN 21 2011 MOC099-187-221-212000- /O.CON.KLSX.SV.W.0370.000000T0000Z-110621T2000Z/ JEFFERSON MO-ST. FRANCOIS MO-WASHINGTON MO- 232 PM CDT TUE JUN 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN WASHINGTON...ST. FRANCOIS AND SOUTHERN JEFFERSON COUNTIES UNTIL 300 PM CDT... AT 229 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR DE SOTO...MOVING NORTHEAST AT 45 MPH. IN ADDITION...AT 217 PM...QUARTER SIZED HAIL WAS REPORTED 3 MILES SOUTHWEST OF POTOSI WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... HILLSBORO...OLYMPIAN VILLAGE...MORSE MILL...VICTORIA...HEMATITE AND MAPAVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 3810 9084 3836 9064 3814 9028 3779 9078 TIME...MOT...LOC 1931Z 225DEG 39KT 3814 9056 WIND...HAIL 60MPH 1.00IN $$ PHILLIPSON
270 WWUS53 KLSX 211956 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 256 PM CDT TUE JUN 21 2011 MOC099-187-221-212006- /O.EXP.KLSX.SV.W.0370.000000T0000Z-110621T2000Z/ JEFFERSON MO-ST. FRANCOIS MO-WASHINGTON MO- 256 PM CDT TUE JUN 21 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WASHINGTON...ST. FRANCOIS AND SOUTHERN JEFFERSON COUNTIES WILL EXPIRE AT 300 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 800 PM. LAT...LON 3810 9084 3836 9064 3814 9028 3779 9078 TIME...MOT...LOC 1956Z 225DEG 39KT 3833 9031 $$ PHILLIPSON
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:52 PM CDT | River Flood Warning | LSX | Lewis | 47 hr |
| Jun 21, 1:46 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois | 44 min |
| Jun 21, 2:44 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Louis | 46 min |
| Jun 21, 6:34 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve | 41 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.