Alert archive / Missouri / Tornado Watches in 2011

Tornado Watch 366

May 25, 201122 counties in Illinois; Lee County, Iowa; 49 counties in Missouri

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.

IssuedProductOfficeCountiesLasted
May 25, 1:29 AM CDTSevere Thunderstorm WarningSGFMiller31 min
May 25, 1:32 AM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau43 min
May 25, 1:35 AM CDTSevere Thunderstorm WarningLSXAudrain, Lincoln, Montgomery, Pike, Ralls40 min
May 25, 1:37 AM CDTTornado WarningSGFDouglas, Webster, Wright23 min
May 25, 1:38 AM CDTSevere Thunderstorm WarningSGFCamden, Laclede, Miller, Pulaski37 min
May 25, 1:55 AM CDTSevere Thunderstorm WarningSGFDouglas, Laclede, Pulaski, Texas, Webster, Wright50 min
May 25, 1:59 AM CDTSevere Thunderstorm WarningSGFMiller12 min
May 25, 2:00 AM CDTSevere Thunderstorm WarningLSXAdams, Calhoun, Greene, Jersey, Pike45 min
May 25, 2:32 AM CDTSevere Thunderstorm WarningSGFDent, Laclede, Maries, Phelps, Pulaski, Texas58 min
May 25, 3:44 AM CDTTornado WarningSGFDouglas, Texas46 min
May 25, 3:55 AM CDTFlash Flood WarningLSXLewis, Marion, Shelby6 hr
May 25, 4:00 AM CDTSevere Thunderstorm WarningSGFDent, Phelps, Pulaski, Texas, Wright45 min
May 25, 4:03 AM CDTTornado WarningSGFDouglas, Howell, Texas, Wright42 min
May 25, 4:04 AM CDTTornado WarningSGFDent, Phelps, Pulaski, Texas41 min
May 25, 4:15 AM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey35 min
May 25, 4:35 AM CDTTornado WarningSGFDent, Shannon, Texas40 min
May 25, 4:39 AM CDTTornado WarningLSXCalhoun, Greene, Jersey22 min
May 25, 5:17 AM CDTTornado WarningSGFDent32 min
May 25, 5:47 AM CDTSevere Thunderstorm WarningILXLogan, Mason, Menard, Sangamon58 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2011-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 375 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 12:48 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 23 more57 min
May 25, 4:58 AM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 45 more92 min
May 25, 5:46 AM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clay, Clinton and 35 more7 hr
May 25, 7:31 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more59 min
May 25, 7:48 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Clinton, Coles, Crawford and 18 more87 min
May 25, 8:33 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 3 more87 min
May 25, 10:18 AM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Crawford, Cumberland and 12 more57 min
May 25, 10:37 AM CDTTornado WatchSPCAdams, Brown, Pike7 hr
May 25, 11:02 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more28 min
May 25, 11:09 AM CDTTornado Watch PDSSPCAlexander, Bond, Calhoun, Christian, Clark, Clay and 41 more10 hr
May 25, 2:31 PM CDTTornado WatchSPCBureau, Cass, Champaign, DeKalb, DeWitt, Ford and 33 more7 hr
May 25, 2:32 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Pike, Scott58 min
May 25, 3:10 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 6 more95 min
May 25, 5:48 PM CDTMesoscale DiscussionSPCBureau, Champaign, DeKalb, DeWitt, Douglas, Ford and 19 more117 min
May 25, 6:25 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 20 more2 hr
May 24, 7:07 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Cass, Cedar and 14 more53 min
May 24, 7:26 PM CDTTornado WatchSPCAdair, Barry, Barton, Bates, Benton, Buchanan and 48 more7 hr
May 24, 7:42 PM CDTMesoscale DiscussionSPCMcDonald63 min
May 24, 11:24 PM CDTMesoscale DiscussionSPCBenton, Camden, Christian, Cooper, Dallas, Douglas and 15 more96 min
May 25, 9:54 AM CDTMesoscale DiscussionSPCBenton, Butler, Camden, Carter, Christian, Dallas and 24 more96 min
May 25, 11:52 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot83 min
May 25, 12:28 PM CDTTornado Watch PDSSPCDunklin, Pemiscot8 hr
May 25, 1:28 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Caldwell, Callaway, Camden and 44 more92 min
May 25, 2:56 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot94 min
May 25, 5:56 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot64 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.