Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 649

April 30, 2003Lenawee County, Monroe County, Michigan; 31 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2003, 9:48 PM EDT for Lenawee County, Monroe County, Michigan; 31 counties in Ohio. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 9:48 PM EDT (01:48 UTC)
Expired
Apr 30, 2003, 11:15 PM EDT
In force
87 min
Issued by
the Storm Prediction Center
All 33 counties

Lenawee County, MI, Monroe County, MI, Allen County, OH, Ashland County, OH, Auglaize County, OH, Crawford County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Logan County, OH, Lorain County, OH, Lucas County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Summit County, OH, Van Wert County, OH, Wayne County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cleveland radar (KCLE), 127 km from the middle of the area, began a volume at 01:49 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

Detroit, MI (KDTX), launched 00:00Z, 1.8 hours before the alert went out and 154 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.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 342 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1047 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
342 m²/s²
0-3 km storm-relative helicity
394 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

091 
ACUS11 KWNS 010149
SWOMCD
SPC MCD 010148 
OHZ000-MIZ000-INZ000-010315-

MESOSCALE DISCUSSION 0649
NWS STORM PREDICTION CENTER NORMAN OK
0848 PM CDT WED APR 30 2003

AREAS AFFECTED...NRN OH

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 010148Z - 010315Z

THE THREAT OF ISOLATED DAMAGING WINDS/LARGE HAIL WILL CONTINUE FOR
THE NEXT HOUR OR SO. WW IS NOT ANTICIPATED.

LATEST RADAR DATA FROM NRN INDIANA SHOW A BOWING LINE SEGMENT/LEWP
OVER NWRN OH MOVING 260/30KTS ALONG SURFACE WARM FRONT THAT EXTENDS
FROM N OF FDY EWD TO AROUND YNG. THIS ACTIVITY IS OCCURRING IN A
ZONE OF WARM/MOIST ADVECTION ALONG NOSE OF STRENGTHENING 25-35KT
SWLY LLJ AXIS WHERE THE AIRMASS HAS BECOME SLIGHTLY TO MODERATELY
UNSTABLE.

AS THESE TSTMS CONTINUE TO TRACK EWD ACROSS NRN OH...THEY WILL
GRADUALLY MOVE AWAY FROM LOW-LEVEL INSTABILITY AXIS THAT CURRENTLY
EXISTS ACROSS CNTRL PARTS OF IL AND IND. ALTHOUGH ISOLATED LARGE
HAIL/WIND DAMAGE REMAINS POSSIBLE FOR THE NEXT HOUR OR SO...THE
TSTMS SHOULD BEGIN TO WEAKEN AS THEY MOVE INTO NERN OH.

..MEAD.. 05/01/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...CLE...ILN...DTX...IWX...GRR...

41798468 42108444 42168386 42088295 41988235 41738155
41178142 40748161 40458234 40338337 40328441 40728476
41318481

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 8:31 PM EDTMesoscale DiscussionSPCBerrien, Branch, Cass, Saint Joseph119 min
Apr 30, 11:31 PM EDTMesoscale DiscussionSPCBerrien, Branch, Cass, Saint Joseph89 min
May 1, 12:28 AM EDTMesoscale DiscussionSPCBarry, Calhoun, Clinton, Eaton, Genesee, Gratiot and 16 more92 min
May 1, 12:41 PM EDTMesoscale DiscussionSPCColumbiana, Mahoning, Portage, Trumbull3 hr
May 1, 1:09 PM EDTMesoscale DiscussionSPCAllen, Ashland, Auglaize, Champaign, Crawford, Darke and 24 more3 hr
May 1, 1:50 PM EDTSevere Thunderstorm WatchSPCAllen, Ashland, Ashtabula, Auglaize, Belmont, Butler and 56 more5 hr
May 1, 3:35 PM EDTSevere Thunderstorm WatchSPCAdams, Brown, Clermont, Highland, Jackson, Pike and 2 more5 hr
May 1, 4:10 PM EDTMesoscale DiscussionSPCAllen, Ashland, Auglaize, Belmont, Butler, Carroll and 51 more95 min
May 1, 6:11 PM EDTMesoscale DiscussionSPCAdams, Brown, Clermont, Hamilton, Highland, Jackson and 4 more94 min
May 1, 6:55 PM EDTSevere Thunderstorm WatchSPCAshland, Auglaize, Butler, Champaign, Clark, Clinton and 24 more4 hr
May 1, 7:10 PM EDTMesoscale DiscussionSPCAdams, Brown, Clermont, Hamilton, Highland, Jackson and 4 more95 min

Nearby

Mesoscale Discussions in Ohio, 2003Mesoscale Discussions in Michigan, 2003Every mesoscale discussion in 2003

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.