Alert archive / Iowa / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 574

July 11, 200016 counties in Iowa; 10 counties in Missouri; 12 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2000, 11:00 PM CDT for 16 counties in Iowa; 10 counties in Missouri; 12 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jul 11, 2000, 11:00 PM CDT (04:00 UTC)
Expired: Jul 12, 2000, 4:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 38 counties

Adair County, IA, Adams County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Sullivan County, MO, Worth County, MO, Butler County, NE, Cass County, NE, Douglas 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 radar

The Omaha radar (KOAX), 86 km from the middle of the area, began a volume at 03:59 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.

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jul 11, 11:15 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Washington	45 min
Jul 11, 11:15 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	45 min
Jul 12, 12:36 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster	39 min
Jul 12, 1:13 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	47 min

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.0 hours before the alert went out and 86 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: 3053 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

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

024 
WWUS9 KMKC 120339
SEL4  

SEL4  
MKC WW 120335
IAZ000-MOZ000-NEZ000-120900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 574
STORM PREDICTION CENTER NORMAN OK
1035 PM CDT TUE JUL 11 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHWEST IOWA                               
   NORTHWEST MISSOURI                           
   SOUTHEAST NEBRASKA                           

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1100 PM
UNTIL 400 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 95 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF OMAHA NEBRASKA
TO 40 MILES WEST SOUTHWEST OF SPICKARD MISSOURI.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 573...

DISCUSSION...LINE OF STRONG/SEVERE STORMS WITH EMBEDDED BOW ECHOES
CONTINUES SEWD ALONG INSTABILITY AXIS WHERE SURFACE BASED CAPES ARE
ESTIMATED TO 5000 J/KG.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600.  MEAN STORM
MOTION VECTOR 30035.


...MCCARTHY

413,0934 400,0923 400,0961 413,0972

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 23 more	6 hr
Jul 12, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	7 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2000 Severe Thunderstorm Watches in Nebraska, 2000 Severe Thunderstorm Watches in Missouri, 2000 Every 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; radar from the NEXRAD Level II archive.