Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 2000
The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2007, 3:17 PM CDT for 30 counties in Iowa; Houston County, Minnesota; Crawford County, Grant County, Vernon County, Wisconsin. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Sep 21, 2007, 3:17 PM CDT (20:17 UTC)
- Expired
- Sep 21, 2007, 4:45 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 34 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Chickasaw County, IA, Clayton County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Grundy County, IA, Hardin County, IA, Howard County, IA, Iowa County, IA, Jasper County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Warren County, IA, Winneshiek County, IA, Houston County, MN, Crawford County, WI, Grant County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 20:18 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 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1379 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 212018 SWOMCD SPC MCD 212017 WIZ000-IAZ000-MNZ000-212145- MESOSCALE DISCUSSION 2000 NWS STORM PREDICTION CENTER NORMAN OK 0317 PM CDT FRI SEP 21 2007 AREAS AFFECTED...FAR SOUTHEAST MN/SOUTHWEST WI AND EASTERN/CENTRAL IA CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 212017Z - 212145Z CLOSELY MONITORING FOR THE POSSIBILITY OF A SEVERE THUNDERSTORM WATCH FROM SOUTHEAST MN/SOUTHWEST WI INTO MUCH OF CENTRAL/EASTERN IA...A WATCH COULD BE NEEDED FOR PORTIONS OF THE REGION WITHIN THE HOUR. THE STRONGEST STORMS WILL POSE A RISK OF DAMAGING WIND GUSTS AND LARGE HAIL. SOUTH OF TORNADO WATCH 670 ACROSS WI/U.P. OF MI...STORMS ARE RAPIDLY INCREASING ALONG/JUST AHEAD OF SURFACE FRONTAL ZONE FROM SOUTHEAST MN INTO EAST CENTRAL IA. AMPLE INSOLATION/MOISTURE HAS LEAD TO THE DEVELOPMENT OF MODERATE INSTABILITY...WITH QUICKLY WEAKENING INHIBITION AND A CORRIDOR OF MLCAPE GREATER THAN 1000 J/KG JUST AHEAD OF THE COLD FRONT. WHILE MID LEVEL TEMPERATURES WARM AND LOW TO MID TROPOSPHERIC WIND FIELDS ACROSS THE WARM SECTOR WEAKEN WITH SOUTH EXTENT...THE STRONGEST STORMS WILL NEVERTHELESS BE CAPABLE OF DAMAGING WIND GUSTS/LARGE HAIL THROUGH EARLY EVENING. ..GUYER.. 09/21/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MKX...DVN...ARX...DMX... 43849186 43719068 42949013 40839325 41499426 43029290
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 8:40 PM CDT | Mesoscale Discussion | SPC | Lyon | 95 min |
| Sep 21, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allamakee, Benton, Black Hawk, Boone, Bremer and 26 more | 4 hr |
| Sep 21, 6:17 PM CDT | Mesoscale Discussion | SPC | Benton, Cedar, Clinton, Delaware, Des Moines, Dubuque and 16 more | 88 min |
| Sep 20, 11:13 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 4 more | 7 hr |
| Sep 21, 12:00 AM CDT | Tornado Watch | SPC | Becker, Beltrami, Benton, Big Stone, Chippewa, Clay and 28 more | 6 hr |
| Sep 21, 3:08 AM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cook, Itasca, Koochiching, Lake and 2 more | 2 hr |
| Sep 21, 3:29 AM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Benton, Big Stone, Chippewa, Clay and 27 more | 2 hr |
| Sep 21, 6:04 AM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Benton, Carlton, Carver, Cass and 24 more | 5 hr |
| Sep 21, 1:34 PM CDT | Mesoscale Discussion | SPC | Chisago, Cook, Dakota, Dodge, Fillmore, Freeborn and 10 more | 116 min |
| Sep 20, 11:09 PM CDT | Mesoscale Discussion | SPC | Barron, Burnett, Chippewa, Clark, Dunn, Eau Claire and 9 more | 81 min |
| Sep 21, 10:24 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Clark, Columbia, Dodge and 27 more | 66 min |
| Sep 21, 2:46 PM CDT | Tornado Watch | SPC | Adams, Ashland, Bayfield, Chippewa, Clark, Eau Claire and 25 more | 8 hr |
| Sep 21, 6:49 PM CDT | Mesoscale Discussion | SPC | Brown, Door, Kewaunee, Manitowoc, Sheboygan | 86 min |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Wisconsin, 2007Mesoscale Discussions in Minnesota, 2007Every mesoscale discussion in 2007
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.