Alert archive / Iowa / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 269

May 12, 200035 counties in Iowa; 9 counties in Missouri; 13 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2000, 2:00 AM CDT for 35 counties in Iowa; 9 counties in Missouri; 13 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 12, 2000, 2:00 AM CDT (07:00 UTC)
Expired
May 12, 2000, 7:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 57 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Jasper 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, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Worth County, MO, Cass County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.0 hours before the alert went out and 104 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2000-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1014 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2000-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1014 J/kg
Mixed-layer CIN
-135 J/kg
Mixed-layer LCL
1527 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
0.3
Supercell composite
10.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 10:30 PM CDTTornado WatchSPCBenton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 13 more6 hr
May 11, 7:00 PM CDTSevere Thunderstorm WatchSPCAndrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 13 more5 hr
May 12, 12:00 AM CDTSevere Thunderstorm WatchSPCAndrew, Buchanan, Caldwell, Carroll, Cass, Clay and 11 more5 hr
May 12, 4:30 PM CDTSevere Thunderstorm WatchSPCCarter, Christian, Crawford, Dent, Douglas, Franklin and 26 more6 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2000Severe Thunderstorm Watches in Nebraska, 2000Severe Thunderstorm Watches in Missouri, 2000Every severe thunderstorm watch in 2000

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.