Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1502

June 25, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2003, 12:37 AM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2003, 12:37 AM CDT (05:37 UTC)
Expired: Jun 25, 2003, 2:30 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 51 counties

Boone County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Chickasaw County, IA, Crawford County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Hamilton County, IA, Harrison County, IA, Howard County, IA, Ida County, IA, Monona County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Winona County, MN, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Polk County, NE, Saunders County, NE, Seward County, NE, Thurston County, NE, Washington County, NE, York County, NE, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Lincoln County, WI, Marathon County, WI, Monroe County, WI, Oneida County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI

The radar

The Des Moines radar (KDMX), 139 km from the middle of the area, began a volume at 05:39 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

Minneapolis, MN (KMPX), launched 00:00Z, 5.6 hours before the alert went out and 208 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: 5332 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 859 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 288 m²/s²
Significant tornado parameter: 7.4
Supercell composite: 34.1

Open this sounding in Storm Lab

The text

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

713 
ACUS11 KWNS 250537
SWOMCD
SPC MCD 250537 
IAZ000-MOZ000-NEZ000-WIZ000-250730-

MESOSCALE DISCUSSION 1502
NWS STORM PREDICTION CENTER NORMAN OK
1237 AM CDT WED JUN 25 2003

AREAS AFFECTED...ERN NEB THROUGH WRN IA AND CNTRL WI

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 250537Z - 250730Z

THUNDERSTORMS EXPECTED TO CONTINUE DEVELOPING EWD INTO ERN NEB AND
WRN IA NEXT FEW HOURS AS WELL AS INTO CNTRL WI. DAMAGING WIND AND
LARGE HAIL SHOULD BE THE MAIN THREATS. WW WILL LIKELY BE NEEDED E OF
THE CURRENT ACTIVITY.

A SQUALL LINE WITH BOWING SEGMENTS EXTENDS FROM WRN WI SWWD THROUGH
S CNTRL NE. MUCH OF THIS LINE HAS DEVELOPED A RATHER STRONG COLD
POOL WITH STRONG PRESSURE RISES IN ITS WAKE. THE ATMOSPHERE AHEAD OF
THE LINE REMAINS MODERATELY UNSTABLE. THOUGH SOME CAP LIKELY EXISTS
DOWNSTREAM OF THE LINE...STRENGTH OF CONVERGENCE ALONG THE GUST
FRONT WILL LIKELY CONTINUE TO SUPPORT EWD DEVELOPMENT.

..DIAL.. 06/25/2003

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

ATTN...WFO...DMX...EAX...FSD...OAX...GID...GRB...DLH...ARX...MPX...

40099872 42179668 42699518 42579332 40259575 

44329180 46059119 45998933 44998926 43599081

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 8:35 PM CDT	Tornado Watch	SPC	Lyon, Sioux	5 hr
Jun 24, 10:27 PM CDT	Mesoscale Discussion	SPC	Dickinson, Lyon, O'Brien, Osceola, Plymouth, Sioux	93 min
Jun 24, 10:55 PM CDT	Tornado Watch	SPC	Buena Vista, Cerro Gordo, Cherokee, Clay, Dickinson, Emmet and 11 more	5 hr
Jun 25, 10:36 AM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Benton, Cass, Clarke, Davis and 24 more	114 min
Jun 25, 11:38 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Clay, Emmet, Greene and 8 more	2 hr
Jun 25, 11:50 AM CDT	Mesoscale Discussion	SPC	Appanoose, Cedar, Clinton, Davis, Delaware, Des Moines and 18 more	115 min
Jun 25, 12:05 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Benton, Buchanan, Cedar, Clayton, Clinton and 26 more	6 hr
Jun 25, 2:43 PM CDT	Mesoscale Discussion	SPC	Appanoose, Cedar, Clinton, Davis, Decatur, Des Moines and 20 more	2 hr
Jun 24, 7:09 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Big Stone, Carlton, Carver and 31 more	66 min
Jun 24, 7:15 PM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Clay, Traverse, Wilkin	6 hr
Jun 24, 8:15 PM CDT	Tornado Watch	SPC	Anoka, Benton, Brown, Carver, Chippewa, Chisago and 35 more	6 hr
Jun 24, 9:52 PM CDT	Mesoscale Discussion	SPC	Big Stone, Clay, Traverse, Wilkin	83 min
Jun 25, 12:45 PM CDT	Severe Thunderstorm Watch	SPC	Richardson	5 hr
Jun 25, 1:42 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Columbia, Dodge, Florence, Fond du Lac and 11 more	2 hr
Jun 25, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Door, Florence, Forest, Kewaunee and 11 more	5 hr
Jun 25, 5:14 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Door, Florence, Forest, Kewaunee and 10 more	91 min

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Wisconsin, 2003 Mesoscale Discussions in Nebraska, 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.