Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 1849
The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2007, 2:37 PM CDT for 4 states. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2007, 2:37 PM CDT (19:37 UTC)
- Expired
- Aug 22, 2007, 4:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 103 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Grundy County, IA, Guthrie County, IA, Hardin County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Brown County, KS, Doniphan County, KS, Jewell County, KS, Marshall County, KS, Nemaha County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dawson County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE
The radar
The Omaha radar (KOAX), 50 km from the middle of the area, began a volume at 19:38 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
Omaha, NE (KOAX), launched 12:00Z, 7.6 hours before the alert went out and 50 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
- 1071 J/kg
- Mixed-layer CIN
- -277 J/kg
- Mixed-layer LCL
- 1229 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 89 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 221937 SWOMCD SPC MCD 221937 IAZ000-MOZ000-KSZ000-NEZ000-222100- MESOSCALE DISCUSSION 1849 NWS STORM PREDICTION CENTER NORMAN OK 0237 PM CDT WED AUG 22 2007 AREAS AFFECTED...SRN NEB/NRN KS/SWRN AND CENTRAL IA/NRN MO CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 221937Z - 222100Z CONVECTION IS INCREASING S OF ONGOING BAND OF STORMS OVER CENTRAL AND NRN NEB/NWRN IA. WHILE SEVERE THREAT IS FORECAST TO REMAIN MARGINAL...COVERAGE MAY EVENTUALLY REQUIRE WW ISSUANCE. SHOWERS AND SCATTERED THUNDERSTORMS ARE BEGINNING TO DEVELOP ATTM FROM SRN NEB EWD INTO SRN IA/NRN MO...NEAR OUTFLOW ASSOCIATED WITH MORE PERSISTENT CONVECTION TO THE N. AIRMASS CONTINUES TO HEAT/DESTABILIZE...WITH 2500 TO 3000 J/KG MEAN-LAYER CAPE NOW INDICATED. DESPITE FAVORABLE INSTABILITY...MOST CONVECTION IS DEVELOPING NEAR -- AND THEN BEING UNDERCUT BY -- SWD-MOVING CONVECTIVE OUTFLOW. THIS COMBINED WITH MARGINAL SHEAR AT BEST /LOW TO MID-LEVEL FLOW AOB 30 KT PER AREA PROFILERS/ SUGGEST THAT THE PRIMARY SEVERE THREAT WILL REMAIN ISOLATED/GENERALLY LESS THAN 1 1/2 HAIL. WHILE WW IS NOT IMMINENT...ISSUANCE MAY BE REQUIRED IN THE NEXT COUPLE OF HOURS IF SEVERE POTENTIAL APPEARS TO EXPAND IN COVERAGE/INTENSITY. ..GOSS.. 08/22/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DVN...DMX...EAX...OAX...TOP...GID...LBF...GLD... 40310038 41019997 41249763 41349560 42429362 42569165 41909095 40659181 39829337 39679976
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 8:14 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Buchanan, Chickasaw, Clayton, Delaware, Dubuque and 5 more | 8 hr |
| Aug 21, 10:49 PM CDT | Mesoscale Discussion | SPC | Allamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 37 more | 86 min |
| Aug 22, 2:13 AM CDT | Mesoscale Discussion | SPC | Jackson | 62 min |
| Aug 22, 6:45 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more | 60 min |
| Aug 22, 10:12 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cherokee, Clay, Crawford, Humboldt and 8 more | 93 min |
| Aug 22, 3:20 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 6 hr |
| Aug 22, 6:33 PM CDT | Mesoscale Discussion | SPC | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 87 min |
| Aug 21, 8:28 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Ellis, Gove, Graham, Jewell and 15 more | 92 min |
| Aug 22, 6:48 PM CDT | Severe Thunderstorm Watch | SPC | Greeley, Logan, Sherman, Wallace, Wichita | 5 hr |
| Aug 22, 5:31 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 5 more | 89 min |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Missouri, 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.