Alert archive / Missouri / Tornado Watches in 2013
Tornado Watch 263
The Storm Prediction Center issued this tornado watch at May 31, 2013, 5:45 PM CDT for 14 counties in Illinois; 15 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 31, 2013, 5:45 PM CDT (22:45 UTC)
- Expired
- May 31, 2013, 10:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 29 counties
Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Montgomery County, MO, Pike County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 26 km from the middle of the area, began a volume at 22:45 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
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 5:56 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Lincoln, Montgomery, Warren | 49 min |
| May 31, 6:05 PM CDT | Tornado Warning | LSX | Callaway, Montgomery, Warren | 25 min |
| May 31, 6:09 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Osage | 51 min |
| May 31, 6:26 PM CDT | Tornado Warning | LSX | Lincoln, Montgomery, Warren | 34 min |
| May 31, 6:47 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Saint Charles, Warren | 43 min |
| May 31, 6:56 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 34 min |
| May 31, 6:58 PM CDT | Flash Flood Warning | LSX | Cole, Gasconade, Moniteau, Osage | 6 hr |
| May 31, 6:58 PM CDT | Severe Thunderstorm Warning | LSX | Gasconade, Montgomery, Osage | 32 min |
| May 31, 7:16 PM CDT | Tornado Warning | LSX | Lincoln | 29 min |
| May 31, 7:26 PM CDT | Tornado Warning | LSX | Franklin | 34 min |
| May 31, 7:30 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey, Madison | 45 min |
| May 31, 7:48 PM CDT | Tornado Warning | LSX | Saint Charles, Saint Louis | 27 min |
| May 31, 7:59 PM CDT | Tornado Warning | LSX | Monroe | 31 min |
| May 31, 8:08 PM CDT | Tornado Warning | LSX | Madison | 37 min |
| May 31, 8:12 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin, Madison, Monroe, Saint Clair | 48 min |
| May 31, 8:26 PM CDT | Tornado Warning | LSX | Monroe, Saint Clair | 34 min |
| May 31, 8:31 PM CDT | Tornado Warning | LSX | Greene, Jersey, Macoupin | 29 min |
| May 31, 8:33 PM CDT | Tornado Warning | LSX | Bond, Madison | 27 min |
| May 31, 8:43 PM CDT | Flash Flood Warning | LSX | Franklin, Saint Charles, Saint Louis, Warren, City of Saint Louis | 6 hr |
| May 31, 8:50 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette, Macoupin, Madison, Montgomery and 2 more | 55 min |
| May 31, 8:50 PM CDT | Tornado Warning | LSX | Macoupin, Montgomery | 25 min |
| May 31, 8:52 PM CDT | Tornado Warning | LSX | Bond, Madison, Montgomery | 23 min |
| May 31, 8:56 PM CDT | Tornado Warning | LSX | Macoupin, Montgomery | 34 min |
| May 31, 9:07 PM CDT | Tornado Warning | LSX | Macoupin | 23 min |
| May 31, 9:13 PM CDT | Tornado Warning | LSX | Bond, Fayette, Marion, Montgomery | 32 min |
| May 31, 9:21 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison, Saint Clair | 54 min |
| May 31, 9:43 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 47 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 12:00Z, 10.8 hours before the alert went out and 256 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
- 8 J/kg
- Mixed-layer CIN
- -299 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
763 WWUS20 KWNS 312247 SEL3 SPC WW 312247 ILZ000-MOZ000-010300- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 263 NWS STORM PREDICTION CENTER NORMAN OK 545 PM CDT FRI MAY 31 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF SOUTHWEST AND WEST CENTRAL ILLINOIS EAST CENTRAL MISSOURI * EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 545 PM UNTIL 1000 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL TORNADOES POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH NORTHWEST OF VICHY MISSOURI TO 25 MILES EAST OF ALTON ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 260...WW 261...WW 262... DISCUSSION...A MESOSCALE CONVECTIVE SYSTEM NOW DEVELOPING ACROSS CENTRAL MISSOURI IS EXPECTED TO SPREAD INTO THE ST. LOUIS METROPOLITAN AREA DURING THE 00-03Z TIME FRAME...ACCOMPANIED BY THE RISK FOR SEVERE WIND GUSTS...HAIL AND THE RISK FOR A COUPLE OF TORNADOES. IT DOES NOT APPEAR OUT OF THE QUESTION THAT ONE OR TWO DISCRETE SUPERCELLS COULD ALSO FORM IN ADVANCE OF THE PRIMARY EVOLVING STORM CLUSTER. 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 24040. ...KERR
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 7:04 PM CDT | Mesoscale Discussion | SPC | Bond, Boone, Calhoun, Champaign, Christian, Clark and 56 more | 56 min |
| May 30, 7:38 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 12 more | 5 hr |
| May 30, 10:03 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Cook, Crawford and 11 more | 87 min |
| May 31, 8:45 AM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 5 more | 90 min |
| May 31, 5:21 PM CDT | Mesoscale Discussion | SPC | Calhoun, Christian, Greene, Jersey, Logan, Macoupin and 4 more | 54 min |
| May 30, 7:41 PM CDT | Mesoscale Discussion | SPC | Atchison | 2 hr |
| May 30, 8:46 PM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 7 hr |
| May 31, 1:57 AM CDT | Mesoscale Discussion | SPC | Butler, Carter, Oregon, Ripley | 93 min |
| May 31, 2:05 AM CDT | Mesoscale Discussion | SPC | Buchanan, Clay, Clinton, Jackson, Platte, Ray | 85 min |
| May 31, 2:44 AM CDT | Severe Thunderstorm Watch | SPC | Buchanan, Caldwell, Carroll, Cass, Chariton, Clay and 14 more | 5 hr |
| May 31, 4:51 AM CDT | Mesoscale Discussion | SPC | Caldwell, Carroll, Cass, Chariton, Clay, Clinton and 11 more | 114 min |
| May 31, 7:03 AM CDT | Mesoscale Discussion | SPC | Cass, Cooper, Howard, Johnson, Pettis | 57 min |
| May 31, 1:49 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 29 more | 116 min |
| May 31, 2:15 PM CDT | Tornado Watch | SPC | Barry, Barton, Bates, Benton, Boone, Callaway and 30 more | 8 hr |
Nearby
Tornado Watches in Missouri, 2013Tornado Watches in Illinois, 2013Every tornado watch in 2013
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.