Alert archive / Iowa / Tornado Watches in 2000

Tornado Watch 497

June 25, 200044 counties in Iowa

The Storm Prediction Center issued this tornado watch at Jun 25, 2000, 3:00 PM CDT for 44 counties in Iowa. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 25, 2000, 3:00 PM CDT (20:00 UTC)
Expired: Jun 25, 2000, 9:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 44 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Boone County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Greene County, IA, Guthrie County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk 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

The radar

The Des Moines radar (KDMX), 60 km from the middle of the area, began a volume at 20:01 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

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

Issued	Product	Office	Counties	Lasted
Jun 25, 3:15 PM CDT	Severe Thunderstorm Warning	DMX	Cass	45 min
Jun 25, 4:06 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	24 min
Jun 25, 4:25 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	35 min
Jun 25, 4:48 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams	42 min
Jun 25, 4:51 PM CDT	Severe Thunderstorm Warning	DMX	Clarke	39 min
Jun 25, 5:00 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	45 min
Jun 25, 5:06 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Warren	39 min
Jun 25, 5:22 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor	38 min
Jun 25, 5:46 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Warren	44 min
Jun 25, 5:46 PM CDT	Severe Thunderstorm Warning	DMX	Clarke	44 min
Jun 25, 6:03 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold	42 min
Jun 25, 6:36 PM CDT	Flash Flood Warning	DMX	Decatur	4 hr
Jun 25, 6:41 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	34 min
Jun 25, 6:51 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe	54 min
Jun 25, 6:57 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	63 min
Jun 25, 7:38 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Monroe	7 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 246 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: 16 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

718 
WWUS9 KMKC 251944
SEL7  

SEL7  
MKC WW 251940
IAZ000-260200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 497
STORM PREDICTION CENTER NORMAN OK
240 PM CDT SUN JUN 25 2000

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   CENTRAL AND SOUTHERN IOWA                               

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 300 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 105 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES EAST OF LAMONI IOWA TO 65 MILES NORTHEAST
OF DES MOINES IOWA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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 494...WW 495...WW 496...

DISCUSSION...THUNDERSTORM COMPLEX NOW N OF OMA EXPECTED
MOVE/DEVELOP ESE INTO PARTS OF IA THIS AFTERNOON AS LOW LEVEL JET
SHIFTS EWD AHEAD OF SPEED MAX DROPPING ESE FROM THE NRN PLNS.  
AIR MASS SHOULD CONTINUE TO RECOVER ACROSS WATCH AREA...WITH
SURFACE DEWPOINTS LIKELY TO REMAIN IN THE UPPER 60S/LOW 70S.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. 
MEAN STORM MOTION VECTOR 27025.

...CORFIDI

421,0905 403,0911 403,0951 421,0945

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 1:30 PM CDT	Tornado Watch	SPC	Audubon, Carroll, Cass, Crawford, Fremont, Harrison and 6 more	7 hr

Nearby

Tornado Watches in Iowa, 2000 Every tornado 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.