Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 125, NWS Des Moines, IA

July 5, 2000Marion County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 5, 2000, 11:46 AM CDT for Marion County, Iowa. It was in force for 44 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 5, 2000, 11:46 AM CDT (16:46 UTC)
Expired: Jul 5, 2000, 12:30 PM CDT
In force: 44 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Marion County, IA

What was reported inside it

Time	Report	Where	Remark
Jul 5, 12:30 PM CDT	Thunderstorm Wind 61 E	Knoxville, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 5, 10:30 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.8 hours before the alert went out and 229 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: 113 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

886 
WUUS53 KDMX 051646
SVRDSM
IAC125-051730-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1146 AM CDT WED JUL 5 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MARION COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 1230 PM

* AT 1145 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM SWAN TO 15 MILES SOUTHWEST OF
  MELCHER-DALLAS...OR FROM 17 MILES SOUTHEAST OF DES MOINES TO 31
  MILES SOUTH OF DES MOINES...MOVING SOUTHEAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE...
  NEAR PLEASANTVILLE AROUND 1150 AM
  NEAR KNOXVILLE AROUND NOON
  NEAR MARYSVILLE AROUND 1210 PM
  NEAR HAMILTON AROUND 1220 PM

DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED
AREA.

LAT...LON 4151 9333 4122 9328 4116 9335 4116 9325
          4116 9290 4135 9308

NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 5, 10:55 AM CDT, 51 minutes earlier.

Area forecast discussion, Jul 5, 10:55 AM CDT, 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
1055 AM CDT WED JUL 5 2000

SENT UPDATED ZONES FOR THE SEVERE THUNDERSTORM WATCH.  BASICALLY I
UPDATED ZONES TO REFLECT EITHER OCCASIONAL OR SCATTERED
THUNDERSTORMS.  I DID NOT GET CUTE WITH TIMING AS THERE ARE TWO MAIN
COMPLEXES WHICH WILL MOVE THROUGH THE CWA TODAY.

.DSM...SVR WATCH FOR SRN HALF CWA TIL 20Z.

FAB

In the hours before

Special weather statement, Jul 5, 6:07 AM CDT, 5 hours 39 minutes before

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-061100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
607 AM CDT WED JUL 5 2000

HAZARD--ISOLATED SEVERE THUNDERSTORMS WITH LOCALLY HEAVY RAIN
LATE THIS AFTERNOON AND TONIGHT WITH THE MAIN THREAT BEING WIND GUSTS
NEAR 70 MPH AND HAIL UP TO AN INCH. RAINFALL AMOUNTS AROUND TWO
INCHES POSSIBLE.

AREA OF CONCERN--MAINLY ALONG AND WEST OF INTERSTATE 35.

TIMING DETAILS--AFTER 6 PM WEDNESDAY THROUGH 6 AM CDT THURSDAY.

METEOROLOGICAL COMMENTS--A COMPLEX OF THUNDERSTORMS WILL DEVELOP
IN CENTRAL NEBRASKA TODAY AND PUSH EAST INTO WESTERN AND SOUTHERN
PORTIONS OF IOWA BY LATE THIS AFTERNOON INTO THE OVERNIGHT HOURS.
DAMAGING WINDS AND LARGE HAIL ARE THE MAIN SEVERE WEATHER THREATS
WITH THESE STORMS. HEAVY RAINS ARE ALSO POSSIBLE.

PRECAUTIONS--SPOTTER ACTIVATION MAY BE NEEDED BY LATE THIS AFTERNOON
AND TONIGHT FOR SEVERE WEATHER AND FOR FLOODING CONCERNS.

KNOLLHOFF

Special weather statement, Jul 5, 11:40 AM CDT, 6 minutes before

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-061100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1140 AM CDT WED JUL 5 2000

HAZARD--THUNDERSTORMS WITH WIND GUSTS TO 60 MPH...PEA SIZED HAIL AND
TORRENTIAL RAIN.  RAINFALL RATES WILL EXCEED AN INCH AN HOUR WHICH
COULD PRODUCE LOCAL FLOODING.

AREA OF CONCERN--ALONG AND SOUTH OF HIGHWAY 30.

TIMING DETAILS--CURRENTLY THROUGH 3 PM AND AGAIN AFTER 10 PM.

METEOROLOGICAL COMMENTS--A LINE OF THUNDERSTORMS DEVELOPED ALONG AN
OLD THUNDERSTORM BOUNDARY IN NORTHWEST IOWA AND IS MOVING SOUTHEAST
ALONG A STATIONARY FRONT OVER SOUTHERN IOWA.  THIS LINE OF STORMS
WILL EXIT CENTRAL IOWA BY 1 PM.

MEANWHILE A SECOND COMPLEX OF STORMS OVER NORTHEAST NEBRASKA WILL
MOVE SOUTHEAST ALONG THE STATIONARY FRONT BRINGING A SECOND ROUND OF
THUNDERSTORMS OVER ESSENTIALLY THE SAME AREAS.  FREEZING LEVELS ARE
QUITE HIGH SO LARGE HAIL IS A MINIMAL THREAT.  SOUNDINGS AND QPF VALUES
INDICATE THE MAIN THREAT WILL BE STRONG WIND AND VERY HEAVY RAIN.

PRECAUTIONS--SPOTTER ACTIVATION WILL BE NEEDED NOW THROUGH 3 PM FOR
THE CENTRAL PORTION OF THE STATE.  SPOTTER ACTIVATION MAY ALSO AGAIN
BE NEEDED OVERNIGHT.  EMERGENCY MANAGERS AND LOCAL OFFICIALS NEED TO
KEEP ABREAST OF THE LATEST FORECASTS AND STATEMENTS FROM THE
NATIONAL WEATHER SERVICE FOR STRONG WIND AND THE POTENTIAL FOR
FLOODING.
$$(

FAB

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 5, 8:23 AM CDT	Severe Thunderstorm Warning	DMX	Crawford	52 min
Jul 5, 10:42 AM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison	33 min
Jul 5, 10:58 AM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	47 min
Jul 5, 12:10 PM CDT	Severe Thunderstorm Warning	DMX	Marion	35 min
Jul 5, 12:20 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe	40 min
Jul 5, 12:53 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	47 min
Jul 5, 2:02 PM CDT	Severe Thunderstorm Warning	DMX	Adams	43 min
Jul 5, 2:07 PM CDT	Flash Flood Warning	DMX	Jefferson, Van Buren	6 hr
Jul 5, 2:40 PM CDT	Flash Flood Warning	DMX	Adams, Union	6 hr
Jul 5, 3:04 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	41 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2000 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.