Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 673

May 1, 200340 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 8:39 PM EDT for 40 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2003, 8:39 PM EDT (00:39 UTC)
Expired: May 1, 2003, 10:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 40 counties

Allen County, OH, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Coshocton County, OH, Crawford County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Medina County, OH, Miami County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Richland County, OH, Ross County, OH, Seneca County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 111 km from the middle of the area, began a volume at 00:39 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 00:00Z, 0.7 hours before the alert went out and 109 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 783 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1639 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

481 
ACUS11 KWNS 020040
SWOMCD
SPC MCD 020039 
OHZ000-020245-

MESOSCALE DISCUSSION 0673
NWS STORM PREDICTION CENTER NORMAN OK
0739 PM CDT THU MAY 01 2003

AREAS AFFECTED...CENTRAL OHIO

CONCERNING...SEVERE THUNDERSTORM WATCH 203...

VALID 020039Z - 020245Z

SQUALL LINE OVER WRN OH WILL BE THE FOCUS FOR SEVERE WEATHER THROUGH
03Z.  SURFACE ANALYSIS SHOWS MESO-LOW LOCATED NEAR FDY AT 00Z...ON
THE INTERSECTION OF THE WARM FRONT AND SQUALL LINE.  00Z ILN
SOUNDING SHOWS AROUND 1000 MLCAPE...WITH MINIMAL SPEED SHEAR WITH
HEIGHT.  GIVEN EXISTENCE OF WARM LAYER AROUND 550 MB AND
NIGHTFALL...CONVECTION AWAY FROM THE SQUALL LINE WILL LIKELY REMAIN
BELOW SEVERE LIMITS.  A FEW DAMAGING GUSTS WILL BE THE THREAT OVER
THE NEXT FEW HOURS AS CONVECTIVE SYSTEM / SQUALL LINE MOVES EWD INTO
SUFFICIENT INSTABILITY.  

..JEWELL.. 05/02/2003

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

ATTN...WFO...PBZ...RLX...CLE...ILN...IWX...

39668416 40798449 41218334 41148168 40588128 39668148
39028376

Nearby

Mesoscale Discussions in Ohio, 2003 Every 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.