Alert archive / Ohio / Mesoscale Discussions in 2011
Mesoscale Discussion 721
The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 12:37 AM EDT for 18 counties in Kentucky; 27 counties in Ohio; 4 counties in West Virginia. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2011, 12:37 AM EDT (04:37 UTC)
- Expired
- May 11, 2011, 1:30 AM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 49 counties
Boyd County, KY, Breathitt County, KY, Carter County, KY, Elliott County, KY, Floyd County, KY, Greenup County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Menifee County, KY, Morgan County, KY, Perry County, KY, Pike County, KY, Rowan County, KY, Wolfe County, KY, Adams County, OH, Allen County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Hancock County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Logan County, OH, Madison County, OH, Paulding County, OH, Pickaway County, OH, Pike County, OH, Putnam County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Cabell County, WV, Lincoln County, WV, Mingo County, WV, Wayne County, WV
The radar
The Cincinnati radar (KILN), 43 km from the middle of the area, began a volume at 04:37 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 4.6 hours before the alert went out and 41 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
- 1068 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 2337 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
508
ACUS11 KWNS 110437
SWOMCD
SPC MCD 110437
WVZ000-OHZ000-VAZ000-KYZ000-110530-
MESOSCALE DISCUSSION 0721
NWS STORM PREDICTION CENTER NORMAN OK
1137 PM CDT TUE MAY 10 2011
AREAS AFFECTED...OH...ERN KY...WRN WV
CONCERNING...SEVERE THUNDERSTORM WATCH 272...
VALID 110437Z - 110530Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 272
CONTINUES.
...NEW SEVERE THUNDERSTORM WATCH MAY BE REQUIRED ACROSS PORTIONS OF
THE OH VALLEY...
MOIST LOW LEVEL WARM ADVECTION HAS PROVEN EFFICIENT IN TSTM
GENERATION ALONG ERN EDGE OF CAP ACROSS THE OH VALLEY. THIS PROCESS
WILL LIKELY CONTINUE WELL INTO THE PRE-DAWN HOURS AS WLY LOW LEVEL
INFLOW PERSISTS INTO THE FRONT SIDE OF THE UPPER RIDGE AXIS. LATEST
RADAR DATA SUGGESTS AN EXPANDING ZONE OF CONVECTION ACROSS WRN/SRN
OH WHICH COULD EASILY EVOLVE INTO ANOTHER SWD SURGING MCS BY 07-08Z.
WILL MONITOR THIS REGION FOR POSSIBLE SEVERE THUNDERSTORM WATCH.
..DARROW.. 05/11/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RLX...CLE...JKL...ILN...IWX...
LAT...LON 41138378 39638217 37418190 37198357 39598380 41288475
41138378SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:17 PM EDT | Mesoscale Discussion | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Fleming and 16 more | 58 min |
| May 11, 1:01 AM EDT | Severe Thunderstorm Watch | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Fleming and 16 more | 5 hr |
| May 11, 5:07 AM EDT | Mesoscale Discussion | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Fleming and 16 more | 53 min |
| May 10, 9:01 PM EDT | Mesoscale Discussion | SPC | Logan, McDowell | 59 min |
Nearby
Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in West Virginia, 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.