Alert archive / Indiana / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 342
The Storm Prediction Center issued this severe thunderstorm watch at May 23, 2011, 2:15 PM EDT for 21 counties in Indiana; 19 counties in Michigan; 14 counties in Ohio. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 23, 2011, 2:15 PM EDT (18:15 UTC)
- Expired
- May 23, 2011, 10:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 54 counties
Adams County, IN, Allen County, IN, Blackford County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Genesee County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH
The radar
The Detroit radar (KDTX), 92 km from the middle of the area, began a volume at 18:16 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
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 23, 3:42 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 40 min |
| May 23, 4:06 PM EDT | Severe Thunderstorm Warning | IWX | Cass, Fulton, Kosciusko, Miami, Wabash | 39 min |
| May 23, 4:15 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 45 min |
| May 23, 4:28 PM EDT | Severe Thunderstorm Warning | IWX | Huntington, Miami, Wabash, Whitley | 47 min |
| May 23, 4:36 PM EDT | Severe Thunderstorm Warning | CLE | Wood | 39 min |
| May 23, 5:03 PM EDT | Severe Thunderstorm Warning | CLE | Ottawa, Sandusky | 42 min |
| May 23, 5:04 PM EDT | Severe Thunderstorm Warning | GRR | Jackson | 26 min |
| May 23, 5:09 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 66 min |
| May 23, 5:11 PM EDT | Severe Thunderstorm Warning | IWX | Huntington, Wabash, Wells | 49 min |
| May 23, 5:20 PM EDT | Severe Thunderstorm Warning | CLE | Lucas | 11 min |
| May 23, 5:30 PM EDT | Tornado Warning | IWX | Huntington, Wells | 30 min |
| May 23, 5:35 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 55 min |
| May 23, 5:40 PM EDT | Severe Thunderstorm Warning | IWX | Adams, Allen, Wells | 47 min |
| May 23, 5:59 PM EDT | Severe Thunderstorm Warning | IWX | Adams, Wells | 46 min |
| May 23, 6:06 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 54 min |
| May 23, 6:07 PM EDT | Flash Flood Warning | IWX | Huntington | 3 hr |
| May 23, 6:25 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 80 min |
| May 23, 6:45 PM EDT | Severe Thunderstorm Warning | IWX | Allen, Van Wert | 37 min |
| May 23, 6:48 PM EDT | Tornado Warning | IWX | Allen, Van Wert | 42 min |
| May 23, 7:13 PM EDT | Tornado Warning | IWX | Allen | 47 min |
| May 23, 7:17 PM EDT | Tornado Warning | IWX | Allen, Putnam | 43 min |
| May 23, 7:27 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw, Wayne | 63 min |
| May 23, 7:34 PM EDT | Flash Flood Warning | IWX | Wabash | 4 hr |
| May 23, 7:39 PM EDT | Severe Thunderstorm Warning | CLE | Hancock | 55 min |
| May 23, 7:50 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 31 min |
| May 23, 8:14 PM EDT | Severe Thunderstorm Warning | CLE | Marion, Seneca, Wyandot | 61 min |
| May 23, 8:37 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Marion, Morrow, Seneca | 36 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
Detroit, MI (KDTX), launched 12:00Z, 6.3 hours before the alert went out and 96 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
- 181 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 746 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
245
WWUS20 KWNS 231815
SEL2
SPC WW 231815
INZ000-MIZ000-OHZ000-LEZ000-LHZ000-240200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 342
NWS STORM PREDICTION CENTER NORMAN OK
215 PM EDT MON MAY 23 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN INDIANA
SOUTHERN AND EASTERN LOWER MICHIGAN
NORTHWEST OHIO
LAKE ERIE
LAKE HURON
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
1000 PM EDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH
NORTHEAST OF MOUNT CLEMENS MICHIGAN TO 50 MILES SOUTH SOUTHWEST
OF FORT WAYNE INDIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 338...WW 339...WW
340...WW 341...
DISCUSSION...TSTMS ARE DEVELOPING ALONG COLD FRONT MOVING EWD
THROUGH REGION WITHIN AN UNCAPPED AND MODERATELY UNSTABLE AIR MASS
WITH MLCAPE OF 1500-2000 J/KG. REGIONAL VWP DATA INDICATE THE
PRESENCE OF A 50-60 KT JET STREAK LOCATED IN THE 700-500 MB
LAYER...RESULTING IN MORE THAN SUFFICIENT VERTICAL SHEAR FOR
SUPERCELLS AND LINE SEGMENTS CAPABLE OF MAINLY DAMAGING WINDS AND
HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26030.
...MEADSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 8:20 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 33 more | 115 min |
| May 22, 10:35 PM EDT | Mesoscale Discussion | SPC | Lake | 55 min |
| May 22, 10:59 PM EDT | Mesoscale Discussion | SPC | Allen, Carroll, Cass, DeKalb, Elkhart, Fulton and 14 more | 61 min |
| May 22, 11:24 PM EDT | Mesoscale Discussion | SPC | Vermillion, Vigo | 66 min |
| May 23, 4:20 AM EDT | Mesoscale Discussion | SPC | Clark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more | 85 min |
| May 23, 8:25 AM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 36 more | 65 min |
| May 23, 11:55 AM EDT | Severe Thunderstorm Watch | SPC | Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick | 7 hr |
| May 23, 12:35 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more | 85 min |
| May 23, 1:37 PM EDT | Mesoscale Discussion | SPC | Clay, Daviess, Gibson, Greene, Knox, Pike and 6 more | 83 min |
| May 23, 1:54 PM EDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 33 more | 5 hr |
| May 23, 3:52 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 42 more | 53 min |
| May 23, 4:28 PM EDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more | 6 hr |
| May 23, 4:58 PM EDT | Mesoscale Discussion | SPC | Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick | 92 min |
| May 23, 6:20 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more | 55 min |
| May 23, 6:40 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, DeKalb, Grant, Howard and 8 more | 65 min |
| May 22, 8:09 PM EDT | Mesoscale Discussion | SPC | Antrim, Crawford, Grand Traverse, Kalkaska, Lake, Missaukee and 3 more | 96 min |
| May 22, 8:42 PM EDT | Mesoscale Discussion | SPC | Dickinson, Iron | 63 min |
| May 23, 7:20 PM EDT | Mesoscale Discussion | SPC | Athens, Belmont, Coshocton, Gallia, Guernsey, Harrison and 15 more | 85 min |
Nearby
Severe Thunderstorm Watches in Indiana, 2011Severe Thunderstorm Watches in Michigan, 2011Severe Thunderstorm Watches in Ohio, 2011Every severe thunderstorm 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.