Alert archive / Iowa / Mesoscale Discussions in 2003
Mesoscale Discussion 1908
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 10:07 AM CDT for 19 counties in Iowa; 9 counties in Minnesota; 6 counties in South Dakota. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 10:07 AM CDT (15:07 UTC)
- Expired
- Jul 20, 2003, 11:00 AM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 34 counties
Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Brookings County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 101 km from the middle of the area, began a volume at 15:07 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 12:00Z, 3.1 hours before the alert went out and 212 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
- 189 J/kg
- Mixed-layer CIN
- -312 J/kg
- Mixed-layer LCL
- 1802 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
065 ACUS11 KWNS 201507 SWOMCD SPC MCD 201507 IAZ000-MNZ000-SDZ000-201600- MESOSCALE DISCUSSION 1908 NWS STORM PREDICTION CENTER NORMAN OK 1007 AM CDT SUN JUL 20 2003 AREAS AFFECTED...SERN SD...SWRN MN...NWRN IA CONCERNING...SEVERE THUNDERSTORM WATCH 770... VALID 201507Z - 201600Z ...CONVECTION WILL CONTINUE TO DEVELOP ACROSS WRN PORTIONS OF WW... NWLY WARM ADVECTION FEED ATOP THE BOUNDARY LAYER APPEARS TO BE DRIVING RENEWED THUNDERSTORM DEVELOPMENT ACROSS WRN PORTIONS OF WW...MAINLY ON BACK SIDE OF CONVECTIVE BUBBLE HIGH. CLOUD LAYER SHEAR IS NOT PARTICULARLY STRONG AND GIVEN NATURE OF ONGOING ACTIVITY...IT MOST LIKELY FALLS IN THE PULSE-MULTICELL STORM STRUCTURE. UNLESS THUNDERSTORMS CAN TRANSITION INTO A FORWARD-PROPAGATING MODE...MARGINAL SEVERE HAIL SHOULD BE THE PRIMARY CONCERN IN THE NEAR TERM. ..DARROW.. 07/20/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD...ABR... 44769545 42749378 42009450 42349607 44429760
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:14 AM CDT | Mesoscale Discussion | SPC | Howard, Mitchell, Winnebago, Winneshiek, Worth | 3 hr |
| Jul 20, 6:45 AM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee, Clay and 22 more | 5 hr |
| Jul 20, 2:09 PM CDT | Mesoscale Discussion | SPC | Crawford, Harrison, Monona, Plymouth, Pottawattamie, Shelby and 2 more | 66 min |
| Jul 20, 2:50 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Buena Vista, Carroll, Cass and 20 more | 6 hr |
| Jul 20, 5:29 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Carroll, Cass, Cherokee and 17 more | 91 min |
| Jul 19, 7:16 PM CDT | Mesoscale Discussion | SPC | Beltrami, Clearwater, Itasca, Kittson, Koochiching, Marshall and 5 more | 89 min |
| Jul 19, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 7 more | 5 hr |
| Jul 20, 1:15 AM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Chippewa, Cottonwood, Douglas, Grant, Jackson and 15 more | 6 hr |
| Jul 20, 2:03 AM CDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Grant, Lac qui Parle, Lincoln, Lyon and 6 more | 117 min |
| Jul 20, 3:05 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Grant, Norman, Otter Tail, Wilkin | 4 hr |
| Jul 20, 1:16 PM CDT | Mesoscale Discussion | SPC | Beltrami, Cook, Itasca, Koochiching, Lake, Lake of the Woods and 2 more | 119 min |
| Jul 20, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | Carlton, Lake, Saint Louis | 7 hr |
| Jul 20, 3:27 PM CDT | Mesoscale Discussion | SPC | Carlton, Lake, Saint Louis | 63 min |
| Jul 20, 5:14 PM CDT | Mesoscale Discussion | SPC | Lincoln, Lyon, Murray, Pipestone, Rock, Yellow Medicine | 2 hr |
| Jul 20, 6:47 PM CDT | Mesoscale Discussion | SPC | Lake, Saint Louis | 88 min |
| Jul 19, 11:58 PM CDT | Mesoscale Discussion | SPC | Brown, Clark, Codington, Day, Deuel, Edmunds and 6 more | 62 min |
Nearby
Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Minnesota, 2003Mesoscale Discussions in South Dakota, 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.