Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 919

May 10, 20034 counties in Illinois; 32 counties in Iowa; Clark County, Schuyler County, Scotland County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 3:17 PM CDT for 4 counties in Illinois; 32 counties in Iowa; Clark County, Schuyler County, Scotland County, Missouri. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 10, 2003, 3:17 PM CDT (20:17 UTC)
Expired: May 10, 2003, 4:15 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 39 counties

Appanoose County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Hancock County, IL, Henderson County, IL, Mercer County, IL, Rock Island County, IL, Clark County, MO, Schuyler County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 123 km from the middle of the area, began a volume at 20:21 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.3 hours before the alert went out and 130 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1102 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

794 
ACUS11 KWNS 102017
SWOMCD
SPC MCD 102017 
ILZ000-IAZ000-MOZ000-102115-

MESOSCALE DISCUSSION 0919
NWS STORM PREDICTION CENTER NORMAN OK
0317 PM CDT SAT MAY 10 2003

AREAS AFFECTED...SERN IA...WRN IL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 102017Z - 102115Z

...TORNADO WATCH WILL LIKELY BE ISSUED FOR PORTIONS OF SERN IA AND
AND PORTIONS OF WRN IL IN THE NEXT HOUR...

WARM SECTOR IS SURGING NWD ACROSS MO TOWARD SERN IA AHEAD OF SFC
LOW...PER EXPANDING BOUNDARY LAYER CU FIELD.  IN THE LAST HOUR MORE
AGGRESSIVE THUNDERSTORM DEVELOPMENT HAS BEEN NOTED ACROSS PORTIONS
OF MO AHEAD OF SFC LOW ALONG MAIN CONFLUENCE BOUNDARY.	LATEST
PRESSURE FALL ANALYSIS INDICATES SFC LOW WILL LIFT NNEWD INTO SOUTH
CENTRAL IA WHICH FAVORS RAPID DESTABILIZATION AND INCREASING
THUNDERSTORM POTENTIAL.  TORNADO WATCH WILL LIKELY BE ISSUED SOON.

..DARROW.. 05/10/2003

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

ATTN...WFO...DVN...DMX...EAX...

42569192 41369395 40569362 40319093 42159003

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 7:47 PM CDT	Mesoscale Discussion	SPC	Calhoun, Greene, Morgan, Pike, Scott	88 min
May 9, 8:40 PM CDT	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clinton, Coles and 18 more	2 hr
May 9, 10:04 PM CDT	Mesoscale Discussion	SPC	Adams	26 min
May 9, 10:40 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more	5 hr
May 10, 5:43 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Christian, Fulton and 15 more	92 min
May 10, 5:50 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	5 hr
May 10, 8:30 AM CDT	Tornado Watch	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more	6 hr
May 10, 9:25 AM CDT	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more	2 hr
May 10, 10:39 AM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Douglas and 5 more	2 hr
May 10, 10:54 AM CDT	Mesoscale Discussion	SPC	Adams, Alexander, Bond, Brown, Calhoun, Cass and 69 more	66 min
May 10, 12:38 PM CDT	Mesoscale Discussion	SPC	Clay, Crawford, Jasper, Lawrence, Richland	97 min
May 10, 3:50 PM CDT	Tornado Watch	SPC	Bureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 14 more	6 hr
May 10, 4:00 PM CDT	Tornado Watch	SPC	Franklin, Jackson, Perry, Randolph, Union	5 hr
May 10, 4:48 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	87 min
May 10, 5:40 PM CDT	Tornado Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 21 more	5 hr
May 10, 6:41 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 14 more	64 min
May 10, 5:57 PM CDT	Mesoscale Discussion	SPC	Allamakee, Clayton, Fayette	93 min
May 10, 6:15 PM CDT	Tornado Watch	SPC	Allamakee, Clayton, Fayette, Winneshiek	5 hr
May 9, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Barton, Bates, Benton, Caldwell, Carroll and 36 more	6 hr
May 10, 1:15 AM CDT	Severe Thunderstorm Watch	SPC	Andrew	5 hr
May 10, 1:22 AM CDT	Mesoscale Discussion	SPC	Newton	83 min
May 10, 2:28 AM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan	92 min
May 10, 3:05 AM CDT	Tornado Watch	SPC	Barton, Bates, Benton, Cedar, Dade, Henry and 7 more	5 hr
May 10, 3:15 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more	5 hr
May 10, 5:27 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cass, Cedar, Dade and 9 more	93 min
May 10, 7:06 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more	54 min
May 10, 10:58 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Audrain, Barton, Bates, Benton and 42 more	2 hr
May 10, 11:35 AM CDT	Tornado Watch	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 38 more	7 hr
May 10, 11:55 AM CDT	Tornado Watch	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 13 more	7 hr
May 10, 1:42 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 38 more	2 hr
May 10, 1:59 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 12 more	2 hr
May 10, 3:30 PM CDT	Mesoscale Discussion	SPC	Crawford, Dent, Douglas, Franklin, Gasconade, Howell and 16 more	2 hr

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Missouri, 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.