Alert archive / Indiana / Tornado Watches in 2015
Tornado Watch 37
The Storm Prediction Center issued this tornado watch at Apr 8, 2015, 4:07 PM CDT for 19 counties in Illinois; 22 counties in Indiana; 9 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2015, 4:07 PM CDT (21:07 UTC)
- Expired
- Apr 8, 2015, 8:15 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 50 counties
Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Bollinger County, MO, Cape Girardeau County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO
The radar
The Evansville,IN radar (KVWX), 49 km from the middle of the area, began a volume at 21:11 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 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 4:13 PM CDT | Severe Thunderstorm Warning | IND | Daviess, Lawrence, Martin | 31 min |
| Apr 8, 4:17 PM CDT | Severe Thunderstorm Warning | LMK | Orange | 38 min |
| Apr 8, 4:19 PM CDT | Severe Thunderstorm Warning | LMK | Clark, Scott, Washington | 31 min |
| Apr 8, 4:26 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 34 min |
| Apr 8, 4:38 PM CDT | Severe Thunderstorm Warning | LMK | Washington | 32 min |
| Apr 8, 4:45 PM CDT | Tornado Warning | PAH | Bollinger, Perry | 45 min |
| Apr 8, 4:53 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 37 min |
| Apr 8, 4:57 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois, Washington | 4 hr |
| Apr 8, 4:58 PM CDT | Severe Thunderstorm Warning | LMK | Clark, Jefferson, Scott | 32 min |
| Apr 8, 5:05 PM CDT | Tornado Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 25 min |
| Apr 8, 5:12 PM CDT | Flash Flood Warning | LMK | Jefferson, Scott, Washington | 2 hr |
| Apr 8, 5:15 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson, Scott | 30 min |
| Apr 8, 5:25 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois, Washington | 22 min |
| Apr 8, 5:27 PM CDT | Severe Thunderstorm Warning | PAH | Bollinger, Perry | 48 min |
| Apr 8, 5:28 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson | 32 min |
| Apr 8, 5:28 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 47 min |
| Apr 8, 5:46 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson | 29 min |
| Apr 8, 5:50 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois | 3 hr |
| Apr 8, 6:12 PM CDT | Severe Thunderstorm Warning | PAH | Bollinger, Cape Girardeau, Perry | 48 min |
| Apr 8, 6:14 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 46 min |
| Apr 8, 6:56 PM CDT | Severe Thunderstorm Warning | PAH | Perry | 18 min |
| Apr 8, 8:02 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson | 31 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, 9.1 hours before the alert went out and 202 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
- 195 J/kg
- Mixed-layer CIN
- -238 J/kg
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.7
The text
As transmitted, in the capitals the NWS used until 2016.
739
WWUS20 KWNS 082105
SEL7
SPC WW 082105
ILZ000-INZ000-MOZ000-090300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 37
NWS STORM PREDICTION CENTER NORMAN OK
405 PM CDT WED APR 8 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* TORNADO WATCH FOR PORTIONS OF
SOUTHERN ILLINOIS
SOUTHERN INDIANA
SOUTHEAST MISSOURI
* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 405 PM
UNTIL 1000 PM CDT.
* PRIMARY THREATS INCLUDE...
A COUPLE TORNADOES POSSIBLE
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 2.5 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 125 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHEAST OF
EVANSVILLE INDIANA TO 25 MILES SOUTHEAST OF CARBONDALE ILLINOIS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).
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 33...WW 34...WW 35...WW
36...
DISCUSSION...SUPERCELL CLUSTERS THAT HAVE FORMED IN RELATIVELY WEAK
LOW-LVL SHEAR THIS AFTN MAY POSE A THREAT FOR A COUPLE TORNADOES
THROUGH EARLY TNGT GIVEN DEGREE OF BUOYANCY AND PRESENCE OF ENHANCED
SRH INVOF W-E FRONTAL SEGMENT BISECTING MAIN AXIS OF WW.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26030.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 7:41 AM CDT | Mesoscale Discussion | SPC | Clark, Coles, Cumberland | 64 min |
| Apr 8, 12:01 PM CDT | Mesoscale Discussion | SPC | Jackson, Monroe, Perry, Randolph, Saint Clair, Washington | 59 min |
| Apr 8, 12:50 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 32 more | 85 min |
| Apr 8, 1:05 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 42 more | 5 hr |
| Apr 8, 2:43 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 45 more | 92 min |
| Apr 8, 3:42 PM CDT | Mesoscale Discussion | SPC | Franklin, Gallatin, Hamilton, Jackson, Jefferson, Monroe and 7 more | 63 min |
| Apr 8, 9:16 AM CDT | Mesoscale Discussion | SPC | Clark, Dearborn, Jefferson, Jennings, Ohio, Ripley and 2 more | 119 min |
| Apr 8, 9:34 AM CDT | Severe Thunderstorm Watch | SPC | Dearborn, Franklin, Jefferson, Ohio, Ripley, Switzerland | 5 hr |
| Apr 7, 7:58 PM CDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 14 more | 62 min |
| Apr 8, 10:52 AM CDT | Mesoscale Discussion | SPC | Bath, Bourbon, Boyd, Bracken, Carter, Elliott and 17 more | 83 min |
| Apr 8, 11:33 AM CDT | Severe Thunderstorm Watch | SPC | Floyd, Johnson, Lawrence, Magoffin, Martin, Menifee and 5 more | 5 hr |
| Apr 8, 12:51 PM CDT | Mesoscale Discussion | SPC | Boyd, Breathitt, Carter, Elliott, Floyd, Greenup and 10 more | 84 min |
| Apr 8, 1:55 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 54 more | 2 hr |
| Apr 8, 2:22 PM CDT | Mesoscale Discussion | SPC | Boyd, Breathitt, Clay, Elliott, Floyd, Johnson and 12 more | 83 min |
| Apr 8, 4:50 PM CDT | Mesoscale Discussion | SPC | Adair, Anderson, Barren, Bath, Bourbon, Boyle and 50 more | 115 min |
| Apr 7, 8:24 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Cass, Cedar, Cooper and 13 more | 5 hr |
| Apr 7, 10:13 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Cass, Cedar, Henry and 6 more | 2 hr |
| Apr 8, 6:17 AM CDT | Mesoscale Discussion | SPC | Bates, Benton, Boone, Callaway, Camden, Cass and 19 more | 88 min |
| Apr 8, 6:39 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Audrain, Barton, Bates, Benton, Boone and 54 more | 6 hr |
| Apr 8, 9:33 AM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Benton, Boone, Caldwell, Callaway and 45 more | 57 min |
| Apr 8, 2:21 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 16 more | 114 min |
| Apr 8, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 29 more | 4 hr |
| Apr 8, 5:45 PM CDT | Mesoscale Discussion | SPC | Audrain, Bates, Benton, Boone, Caldwell, Callaway and 39 more | 60 min |
Nearby
Tornado Watches in Indiana, 2015Tornado Watches in Illinois, 2015Tornado Watches in Missouri, 2015Every tornado watch in 2015
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.