Alert archive / Ohio / Mesoscale Discussions in 2011
Mesoscale Discussion 166
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2011, 3:32 AM EST for 20 counties in Indiana; Boone County, Campbell County, Kenton County, Kentucky; 56 counties in Ohio. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2011, 3:32 AM EST (08:32 UTC)
- Expired
- Feb 28, 2011, 4:30 AM EST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 79 counties
Bartholomew County, IN, Brown County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Franklin County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Monroe County, IN, Ohio County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Adams County, OH, Ashland County, OH, Athens County, OH, Auglaize 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, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Jackson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Medina County, OH, Meigs County, OH, Miami County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Preble County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Wayne County, OH, Wyandot County, OH
The radar
The Cincinnati radar (KILN), 67 km from the middle of the area, began a volume at 08:35 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, 8.5 hours before the alert went out and 66 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 539 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 325 m²/s²
- 0-3 km storm-relative helicity
- 380 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
790
ACUS11 KWNS 280833
SWOMCD
SPC MCD 280832
OHZ000-KYZ000-INZ000-280930-
MESOSCALE DISCUSSION 0166
NWS STORM PREDICTION CENTER NORMAN OK
0232 AM CST MON FEB 28 2011
AREAS AFFECTED...PARTS OF CENTRAL/SERN IND AND SWRN/WEST CENTRAL
INTO NRN/NERN OH
CONCERNING...TORNADO WATCH 27...28...
VALID 280832Z - 280930Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 27...28...CONTINUES.
CONCERN INCREASING FOR BOTH TORNADO AND DAMAGING WIND THREATS AS A
SERIES OF FAST MOVING /55-60 KT/ LINE SEGMENTS/EMBEDDED CIRCULATIONS
CONTINUE TO DEVELOP AND TRACK ENEWD ALONG A WARM FRONT EXTENDING EWD
FROM THE CENTRAL IND SURFACE LOW INTO CENTRAL OH /ACROSS NRN EXTENT
OF WW 28/. ALTHOUGH THE AIR MASS IS MORE STABLE /GREATER SURFACE
BASED CINH N OF THE WARM FRONT/...STORMS MAY CONTINUE TO POSE A
THREAT FOR DAMAGING WINDS...THOUGH AN ISOLATED TORNADO CANNOT BE
RULED OUT AS THE WARM FRONT MOVES NWD. THUS...WW 28 HAS BEEN
LOCALLY EXTENDED IN AREAL COVERAGE TO THE N AND NE.
MESOSCALE ANALYSES INDICATED A SECOND BOUNDARY NORTH OF THE WARM
FRONT EXTENDING FROM THE SURFACE LOW NEWD THROUGH NWRN OH AND ACROSS
LAKE ERIE. PERSISTENT SURFACE PRESSURE FALLS ACROSS OH SUPPORT THE
LOW TRACKING ALONG THE WARM FRONT INTO CENTRAL OH OVERNIGHT/EARLY
MONDAY MORNING...AS SSWLY LOW LEVEL WINDS MAINTAIN A MOIST/UNSTABLE
WARM SECTOR. AT 0810Z...REGIONAL RADAR IMAGERY INDICATED TWO
PARALLEL LINES OF TSTMS EXTENDING FROM MARION COUNTY OH WSWWD TO NRN
JOHNSON COUNTY INDIANA. WITHIN EACH OF THESE LINES AND BETTER
DEFINED WITH THE NRN LINE...RADAR INDICATED A SERIES OF EMBEDDED
LINE SEGMENTS...SOME WITH ROTATION.
SURFACE BASED STORMS WILL REMAIN A LIKELIHOOD ALONG AND S OF THE
WARM FRONT WHERE INHIBITION IS WEAKER...AND 40-50 KT EFFECTIVE BULK
SHEAR WITH 100-200 M2/S2 OF EFFECTIVE SRH SUPPORT SUPERCELLS WITH AN
ATTENDANT TORNADO THREAT IN ADDITION TO DAMAGING WINDS GIVEN THE
FAST MOVING STORMS. TORNADO THREAT SHOULD BE GREATEST ALONG AND
JUST AHEAD OF THE LOW TRACK WHERE LOW LEVEL CONVERGENCE AND SHEAR
WILL BE ENHANCED.
..PETERS.. 02/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...ILN...LMK...IWX...IND...
LAT...LON 41308101 39118179 38638307 38788483 38688634 39368665
40268492 40658435 40878355 41268328 41308101SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 9:25 PM EST | Mesoscale Discussion | SPC | Boone, Brown, Clay, Clinton, Daviess, Dubois and 25 more | 65 min |
| Feb 28, 12:46 AM EST | Tornado Watch | SPC | Bartholomew, Boone, Brown, Clay, Daviess, Decatur and 29 more | 5 hr |
| Feb 28, 1:28 AM EST | Mesoscale Discussion | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 32 min |
| Feb 28, 1:40 AM EST | Tornado Watch | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 6 hr |
| Feb 28, 2:05 AM EST | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Perry, Spencer and 3 more | 25 min |
| Feb 28, 2:33 AM EST | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 7 hr |
| Feb 28, 4:25 AM EST | Mesoscale Discussion | SPC | Clark, Floyd, Harrison, Perry | 65 min |
| Feb 28, 5:31 AM EST | Mesoscale Discussion | SPC | Bath, Boyd, Breathitt, Carter, Clay, Elliott and 31 more | 29 min |
| Feb 28, 5:47 AM EST | Tornado Watch | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clay and 31 more | 5 hr |
Nearby
Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Indiana, 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.