Alert archive / Ohio / Mesoscale Discussions in 2011
Mesoscale Discussion 1839
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2011, 8:21 AM EDT for Boyd County, Greenup County, Lewis County, Kentucky; 50 counties in Ohio; 26 counties in West Virginia. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2011, 8:21 AM EDT (12:21 UTC)
- Expired
- Aug 3, 2011, 9:45 AM EDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 79 counties
Boyd County, KY, Greenup County, KY, Lewis County, KY, Adams County, OH, Athens County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Crawford County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Meigs County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Wyandot County, OH, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Mason County, WV, Nicholas County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV
The radar
The Charleston,WV radar (KRLX), 107 km from the middle of the area, began a volume at 12:21 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 nearest sounding before it
Cncnati-Daytn, OH (KILN), launched 12:00Z, 0.4 hours before the alert went out and 126 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
- 435 J/kg
- Mixed-layer CIN
- -116 J/kg
- Mixed-layer LCL
- 1260 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 301 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
008
ACUS11 KWNS 031222
SWOMCD
SPC MCD 031221
WVZ000-OHZ000-KYZ000-INZ000-031345-
MESOSCALE DISCUSSION 1839
NWS STORM PREDICTION CENTER NORMAN OK
0721 AM CDT WED AUG 03 2011
AREAS AFFECTED...SE IND...SRN OH...NRN-ERN KY
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 031221Z - 031345Z
A SEVERE THREAT MAY CONTINUE TO SPREAD SEWD ACROSS SRN OH INTO NRN
AND ERN KY BY MID-MORNING. THE MAIN THREAT WILL BE WIND DAMAGE AS A
LINE-SEGMENT MOVES OUT OF THE LOCAL WW EXTENSION IN THE CINCINNATI
AND COVINGTON AREAS. WW ISSUANCE COULD BE NEEDED SOUTHEAST OF THE WW
EXTENSION IF THE LINE CAN REMAIN STRONG.
A STRONG TO SEVERE LINE-SEGMENT IS ONGOING IN SE IND AND SW OH ON
THE ERN EDGE OF A POCKET OF MODERATE INSTABILITY WHERE MESOANALYSIS
ESTIMATES MLCAPE VALUES IN THE 750 TO 1000 J/KG RANGE. BEHIND THE
LINE...A WELL-DEFINED 40 TO 50 KT 700 MB JET IS ANALYZED. THIS
FEATURE IS HELPING TO CREATE A FAVORABLE SHEAR PROFILE FOR SEVERE
THUNDERSTORM DEVELOPMENT. UNIDIRECTIONAL FLOW IN THE LOW TO
MID-LEVELS ALONG WITH A FORWARD SPEED OF THE LINEAR MCS OF ABOUT 40
KT SHOULD CONTINUE A WIND DAMAGE THREAT INTO THE COVINGTON AREA OVER
THE NEXT HOUR AND SEWD INTO NRN KY AFTER 13Z. THE SEVERE THREAT
SHOULD BECOME INCREASINGLY ISOLATED AS THE LINE INTERACTS WITH WEAK
INSTABILITY LATE THIS MORNING.
..BROYLES.. 08/03/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...PBZ...RLX...CLE...ILN...IWX...
LAT...LON 39338025 40288153 40788226 41198323 40568419 40148451
39728482 39378476 39128455 38718401 38368313 38098255
37908191 37858151 37858097 37938062 38178035 38478016
39338025SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 1:48 AM EDT | Severe Thunderstorm Watch | SPC | Boone, Campbell, Carroll, Gallatin, Grant, Kenton and 2 more | 8 hr |
| Aug 3, 4:28 AM EDT | Mesoscale Discussion | SPC | Boyd, Greenup, Lewis | 92 min |
| Aug 3, 10:01 AM EDT | Severe Thunderstorm Watch | SPC | Adair, Anderson, Bath, Bell, Boyle, Breathitt and 47 more | 7 hr |
| Aug 3, 1:26 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Boyle, Breckinridge and 51 more | 64 min |
| Aug 3, 5:02 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 46 more | 6 hr |
| Aug 3, 7:43 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 49 more | 62 min |
| Aug 2, 9:34 PM EDT | Mesoscale Discussion | SPC | Fulton, Williams | 86 min |
| Aug 3, 12:25 AM EDT | Mesoscale Discussion | SPC | Williams | 95 min |
Nearby
Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in West Virginia, 2011Mesoscale Discussions in Kentucky, 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.