Alert archive / Missouri / Tornado Watches in 2011
Tornado Watch 366
The Storm Prediction Center issued this tornado watch at May 25, 2011, 1:22 AM CDT for 22 counties in Illinois; Lee County, Iowa; 49 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 25, 2011, 1:22 AM CDT (06:22 UTC)
- Expired
- May 25, 2011, 8:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 72 counties
Lee County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Logan County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Morgan County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Christian County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Laclede County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scotland County, MO, Shannon County, MO, Shelby County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO
The radar
The St Louis radar (KLSX), 94 km from the middle of the area, began a volume at 06:21 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 1:29 AM CDT | Severe Thunderstorm Warning | SGF | Miller | 31 min |
| May 25, 1:32 AM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Moniteau | 43 min |
| May 25, 1:35 AM CDT | Severe Thunderstorm Warning | LSX | Audrain, Lincoln, Montgomery, Pike, Ralls | 40 min |
| May 25, 1:37 AM CDT | Tornado Warning | SGF | Douglas, Webster, Wright | 23 min |
| May 25, 1:38 AM CDT | Severe Thunderstorm Warning | SGF | Camden, Laclede, Miller, Pulaski | 37 min |
| May 25, 1:55 AM CDT | Severe Thunderstorm Warning | SGF | Douglas, Laclede, Pulaski, Texas, Webster, Wright | 50 min |
| May 25, 1:59 AM CDT | Severe Thunderstorm Warning | SGF | Miller | 12 min |
| May 25, 2:00 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Calhoun, Greene, Jersey, Pike | 45 min |
| May 25, 2:32 AM CDT | Severe Thunderstorm Warning | SGF | Dent, Laclede, Maries, Phelps, Pulaski, Texas | 58 min |
| May 25, 3:44 AM CDT | Tornado Warning | SGF | Douglas, Texas | 46 min |
| May 25, 3:55 AM CDT | Flash Flood Warning | LSX | Lewis, Marion, Shelby | 6 hr |
| May 25, 4:00 AM CDT | Severe Thunderstorm Warning | SGF | Dent, Phelps, Pulaski, Texas, Wright | 45 min |
| May 25, 4:03 AM CDT | Tornado Warning | SGF | Douglas, Howell, Texas, Wright | 42 min |
| May 25, 4:04 AM CDT | Tornado Warning | SGF | Dent, Phelps, Pulaski, Texas | 41 min |
| May 25, 4:15 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 35 min |
| May 25, 4:35 AM CDT | Tornado Warning | SGF | Dent, Shannon, Texas | 40 min |
| May 25, 4:39 AM CDT | Tornado Warning | LSX | Calhoun, Greene, Jersey | 22 min |
| May 25, 5:17 AM CDT | Tornado Warning | SGF | Dent | 32 min |
| May 25, 5:47 AM CDT | Severe Thunderstorm Warning | ILX | Logan, Mason, Menard, Sangamon | 58 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 6.4 hours before the alert went out and 291 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
- 375 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1724 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
960
WWUS20 KWNS 250624
SEL6
SPC WW 250624
IAZ000-ILZ000-MOZ000-251300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 366
NWS STORM PREDICTION CENTER NORMAN OK
120 AM CDT WED MAY 25 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
FAR SOUTHEAST IOWA
WESTERN ILLINOIS
EASTERN AND SOUTHERN MISSOURI
EFFECTIVE THIS WEDNESDAY MORNING FROM 120 AM UNTIL 800 AM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF QUINCY
ILLINOIS TO 20 MILES SOUTH SOUTHEAST OF WEST PLAINS MISSOURI.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 363...WW 364...WW 365...
DISCUSSION...TSTMS POSING A THREAT FOR ISOLD TORNADOES...DMGG
WIND...AND HAIL EXPECTED TO CONTINUE MOVING/DEVELOPING NEWD FROM NRN
AR AND S CNTRL MO INTO ERN MO LATER THIS MORNING...IN TANDEM WITH
ASSOCIATED VORT LOBE/STRENGTHENING WIND FIELD ROTATING AROUND BASE
OF KS UPR LOW. FARTHER N...SFC-BASED INSTABILITY WILL BE MORE
LIMITED...BUT INCREASING UPR LVL FORCING FOR ASCENT AND LOW LVL
UPLIFT ALONG STALLED W-E BOUNDARY MAY SUPPORT AN ISOLD SVR THREAT
OVER SE IA AND ADJACENT PARTS OF NE MO/WRN IL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22035.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 12:48 AM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 23 more | 57 min |
| May 25, 4:58 AM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 45 more | 92 min |
| May 25, 5:46 AM CDT | Tornado Watch | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 35 more | 7 hr |
| May 25, 7:31 AM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 59 min |
| May 25, 7:48 AM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Clinton, Coles, Crawford and 18 more | 87 min |
| May 25, 8:33 AM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 3 more | 87 min |
| May 25, 10:18 AM CDT | Mesoscale Discussion | SPC | Bond, Clark, Clay, Clinton, Crawford, Cumberland and 12 more | 57 min |
| May 25, 10:37 AM CDT | Tornado Watch | SPC | Adams, Brown, Pike | 7 hr |
| May 25, 11:02 AM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 28 min |
| May 25, 11:09 AM CDT | Tornado Watch | SPC | Alexander, Bond, Calhoun, Christian, Clark, Clay and 41 more | 10 hr |
| May 25, 2:31 PM CDT | Tornado Watch | SPC | Bureau, Cass, Champaign, DeKalb, DeWitt, Ford and 33 more | 7 hr |
| May 25, 2:32 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin, Pike, Scott | 58 min |
| May 25, 3:10 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 6 more | 95 min |
| May 25, 5:48 PM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, DeKalb, DeWitt, Douglas, Ford and 19 more | 117 min |
| May 25, 6:25 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 20 more | 2 hr |
| May 24, 7:07 PM CDT | Mesoscale Discussion | SPC | Andrew, Barton, Bates, Buchanan, Cass, Cedar and 14 more | 53 min |
| May 24, 7:26 PM CDT | Tornado Watch | SPC | Adair, Barry, Barton, Bates, Benton, Buchanan and 48 more | 7 hr |
| May 24, 7:42 PM CDT | Mesoscale Discussion | SPC | McDonald | 63 min |
| May 24, 11:24 PM CDT | Mesoscale Discussion | SPC | Benton, Camden, Christian, Cooper, Dallas, Douglas and 15 more | 96 min |
| May 25, 9:54 AM CDT | Mesoscale Discussion | SPC | Benton, Butler, Camden, Carter, Christian, Dallas and 24 more | 96 min |
| May 25, 11:52 AM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 83 min |
| May 25, 12:28 PM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 8 hr |
| May 25, 1:28 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Boone, Caldwell, Callaway, Camden and 44 more | 92 min |
| May 25, 2:56 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 94 min |
| May 25, 5:56 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 64 min |
Nearby
Tornado Watches in Missouri, 2011Tornado Watches in Illinois, 2011Tornado Watches in Iowa, 2011Every tornado watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.