Alert archive / Ohio / Mesoscale Discussions in 2011
Mesoscale Discussion 1920
The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2011, 6:35 PM EDT for 15 counties in Indiana; 35 counties in Ohio. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2011, 6:35 PM EDT (22:35 UTC)
- Expired
- Aug 9, 2011, 8:00 PM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 50 counties
Adams County, IN, Blackford County, IN, Boone County, IN, Delaware County, IN, Fayette County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jay County, IN, Madison County, IN, Marion County, IN, Randolph County, IN, Rush County, IN, Wayne County, IN, Allen County, OH, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Cuyahoga County, OH, Darke County, OH, Delaware County, OH, Erie County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Logan County, OH, Lorain County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Miami County, OH, Morrow County, OH, Ottawa County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Summit County, OH, Union County, OH, Van Wert County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH
The radar
The Cincinnati radar (KILN), 128 km from the middle of the area, began a volume at 22:37 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
Detroit, MI (KDTX), launched 12:00Z, 10.6 hours before the alert went out and 246 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
- 22 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 628 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
296
ACUS11 KWNS 092236
SWOMCD
SPC MCD 092235
OHZ000-INZ000-100000-
MESOSCALE DISCUSSION 1920
NWS STORM PREDICTION CENTER NORMAN OK
0535 PM CDT TUE AUG 09 2011
AREAS AFFECTED...CNTRL IND...NRN/CNTRL OH
CONCERNING...SEVERE THUNDERSTORM WATCH 753...
VALID 092235Z - 100000Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 753
CONTINUES.
DAMAGING WIND AND MARGINAL HAIL THREATS CONTINUE WITH SEMI-DISCRETE
CELLS ALONG AND AHEAD OF A COLD FRONT...WHICH MAY TEND TO GROW
UPSCALE INTO SHORT-LINE SEGMENTS. PORTIONS OF THE WW BEHIND THE
FRONT CAN BE CLEARED...WHILE DOWNSTREAM INTO NRN OH AN EXTENSION IN
AREA MAY BECOME NECESSARY IN THE NEXT HOUR.
22Z SURFACE ANALYSIS PLACED A COLD FRONT FROM SERN LOWER MI SWWD TO
CNTRL IND WITH SCATTERED CELLS ALONG AND AHEAD OF THE FRONT. PRIMARY
THREAT WILL REMAIN STRONG TO SEVERE WIND GUSTS /56 KT MEASURED AT
FWA AT 2207Z/...GIVEN 30-40 W/NWLYS PREVALENT AT 2-4 KM AGL PER AREA
VWP DATA. THESE UNIDIRECTIONAL WIND PROFILES NEARLY PERPENDICULAR TO
THE INITIATING BOUNDARY HAVE FOSTERED MAINLY DISCRETE CELLS SO
FAR...BUT UPSCALE GROWTH INTO SHORT-LINE SEGMENTS APPEARS PLAUSIBLE
PER INDICATIONS BY RECENT HRRR GUIDANCE.
..GRAMS.. 08/09/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...CLE...ILN...IWX...IND...
LAT...LON 39968680 40598533 41288417 41578308 41768127 41608105
40688155 40178233 39848421 39558562 39718665 39968680SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:27 PM EDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Cass, Clinton, Fountain and 16 more | 93 min |
| Aug 9, 1:17 PM EDT | Mesoscale Discussion | SPC | Adams, Benton, Blackford, Boone, Carroll, Cass and 28 more | 58 min |
| Aug 9, 3:28 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Bartholomew, Blackford, Boone, Brown and 54 more | 7 hr |
| Aug 9, 6:56 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Cuyahoga and 15 more | 5 hr |
Nearby
Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Indiana, 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.