Alert archive / Ohio / Mesoscale Discussions in 2011
Mesoscale Discussion 1685
The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2011, 11:20 AM EDT for 35 counties in Indiana; 5 counties in Michigan; 39 counties in Ohio. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2011, 11:20 AM EDT (15:20 UTC)
- Expired
- Jul 22, 2011, 12:15 PM EDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 79 counties
Adams County, IN, Allen County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Fayette County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Noble County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Hillsdale County, MI, Jackson County, MI, Lenawee County, MI, Monroe County, MI, Allen County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Darke County, OH, Defiance County, OH, Delaware County, OH, Erie County, OH, Franklin County, OH, Fulton County, OH, Greene County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Lucas County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Ottawa County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH
The radar
The Northern Indiana radar (KIWX), 89 km from the middle of the area, began a volume at 15:23 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Cncnati-Daytn, OH (KILN), launched 12:00Z, 3.3 hours before the alert went out and 180 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
- 3503 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 912 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
710
ACUS11 KWNS 221520
SWOMCD
SPC MCD 221520
OHZ000-MIZ000-INZ000-221615-
MESOSCALE DISCUSSION 1685
NWS STORM PREDICTION CENTER NORMAN OK
1020 AM CDT FRI JUL 22 2011
AREAS AFFECTED...SRN LOWER MICHIGAN...NRN/CENTRAL INDIANA AND NWRN
OHIO.
CONCERNING...OUTLOOK UPGRADE
VALID 221520Z - 221615Z
...PORTIONS OF SRN LOWER MICHIGAN...NRN/CENTRAL INDIANA AND NWRN
OHIO WILL BE UPGRADED TO A SLIGHT RISK ON THE 1630Z DAY 1 OUTLOOK.
AT 1510Z...A LINE OF THUNDERSTORMS...WITH GUSTS MAINLY IN THE 35 TO
55 MPH RANGE...WAS MOVING EAST AT 35 KT THROUGH NERN IL... INCLUDING
THE CHICAGO METRO AREA. THE ACCOMPANYING COLD POOL COMBINED WITH THE
WARMING AND DESTABILIZING BOUNDARY LAYER MAY SUSTAIN STORMS
EWD...THOUGH MOST STORM SCALE MODELS SUGGEST STORMS WILL WEAKEN BY
17Z. IF THESE STORMS DO NOT DISSIPATE...THE INCREASING INSTABILITY
AND 25-30 KT SHEAR WOULD BE SUFFICIENT FOR AT LEAST AN ISOLATED
DAMAGING WIND THREAT THIS AFTERNOON.
ALSO...STORM SCALE MODELS INDICATE STORMS ARE LIKELY TO DEVELOP
ACROSS PORTIONS OF INDIANA AND OHIO...ALONG AND AHEAD OF AN OUTFLOW
BOUNDARY THAT IS MOVING EWD THROUGH EAST CENTRAL ILLINOIS. THIS AREA
IS UNDER THE NRN INFLUENCE OF THE UPPER RIDGE WITH WEAK FLOW ALOFT
AND POOR LAPSE RATES. HOWEVER...STRONG WARMING OF VERY MOIST
BOUNDARY LAYER...DEWPOINTS IN THE MID/UPPER 70S AND MLCAPES AROUND
4000 J/KG...MAY SUPPORT PULSE STORMS WITH A FEW WET MICROBURSTS.
..IMY.. 07/22/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RLX...CLE...ILN...DTX...IWX...GRR...IND...LOT...
LAT...LON 41158589 42278475 42208308 41298223 39898245 39448440
39518609 39758719 40288722 40758700 41158589SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 12:50 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 29 more | 55 min |
| Jul 22, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more | 7 hr |
| Jul 22, 4:32 PM EDT | Mesoscale Discussion | SPC | Jay, Randolph, Wayne | 88 min |
| Jul 22, 3:17 PM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Guernsey, Harrison, Jefferson and 4 more | 58 min |
| Jul 22, 5:19 PM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Geauga, Guernsey and 11 more | 56 min |
| Jul 22, 5:37 PM EDT | Severe Thunderstorm Watch | SPC | Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more | 4 hr |
| Jul 22, 5:59 PM EDT | Mesoscale Discussion | SPC | Gallia, Lawrence | 2 hr |
| Jul 22, 7:10 PM EDT | Mesoscale Discussion | SPC | Clark, Clinton, Coshocton, Delaware, Fairfield, Fayette and 14 more | 35 min |
Nearby
Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Michigan, 2011Every mesoscale discussion 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.