Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 180, NWS Des Moines, IA

August 8, 2000Worth County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 8, 2000, 12:05 AM CDT for Worth County, Iowa. It was in force for 40 min. No storm report in the archive falls 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.

The facts

Issued: Aug 8, 2000, 12:05 AM CDT (05:05 UTC)
Expired: Aug 8, 2000, 12:45 AM CDT
In force: 40 min
Issued by: NWS Des Moines, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Worth County, IA

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 7, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 7, 11:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.1 hours before the alert went out and 169 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: 1134 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 080506
SVRDSM
IAC195-080545-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1205 AM CDT TUE AUG 8 2000

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WORTH COUNTY IN NORTH CENTRAL IOWA

* UNTIL 1245 AM

* AT 1202 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR JOICE...OR ABOUT 18 MILES NORTHWEST OF
  MASON CITY...MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR NORTHWOOD AT 1220 AM 
  NEAR GRAFTON AROUND 1230 AM

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

SEEK A STURDY SHELTER SUCH AS A BASEMENT OR INTERIOR ROOM.

LAT...LON 4327 9351 4326 9350 4326 9304 4350 9304
          4351 9351

FORSTER
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 Aug 7, 9:36 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Aug 7, 9:36 PM CDT, 2 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
936 PM CDT MON AUG 7 2000

CURRENT FORECAST NOT LOOKING TOO BAD...

CONVECTION HAVING A HARD TIME GETTING GOING OVER MY CWA ATTM.  KOAX
00Z SOUNDING STILL HAD SOME CAP AND PLAN VIEW 850 MB SHOWING DEEPEST
MOISTURE REMAINING WELL SOUTH OF IOWA...EXCEPT FOR POOLING IN SRN
MN...NORTH OF 80H WRM FRNT.  TSRA OVR NW IA..SRN MN ALONG AND NORTH
OF 80H BOUNDARY THAT'S SLOWLY SLIDING NORTH.  SOME OF THIS ACTIVITY
WILL STILL EFFECT NRN QUARTER OF CWA TONIGHT...ABOUT WHERE WW IS
CURRENTLY LOCATED THROUGH 06Z.  OF PERHAPS EQUAL IMPORTANCE THOUGH MAY
BE H20 IMAGERY INDICATED S/W OVER SRN SD AND NRN NEB.  THIS
CONTINUES TO TRY TO SET OFF CONVECTION OVER NRN NEB.  WOULD EXPECT
THIS TO HELP BREAK THE CAP LATER THIS EVENING...WITH THUNDERSTORMS
DEVELOPING OVR MO RIVER VALLEY BETWEEN 11 PM OR MIDNIGHT TO 2 AM
TIME FRAME.  LATEST PROFILERS ALSO INDICATE A 25 TO 30 KT LLJ THRU
CEN OK INTO CEN AND NE NEB.  THIS SHOULD ALSO HELP TO MOISTEN LOW
LEVELS UNDERNEATH THE ONCOMING S/W.  SO...WILL ADJUST TSRA WORDING
SOME IN ZFP...BUT NOT MAKE MANY CHANGES IN THE BIG PICTURE.

.DSM...NONE

SEARCY

In the hours before

Special weather statement, Aug 7, 11:28 PM CDT, 37 minutes before

IAZ004>007-015>017-023>028-033>039-044>050-080530-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1128 PM CDT MON AUG 7 2000

...A SEVERE THUNDERSTORM WATCH CONTINUES UNTIL 1 AM FOR THE
FOLLOWING COUNTIES IN THE DES MOINES COUNTY WARNING AREA...

EMMET...KOSSUTH...WINNEBAGO...PALO ALTO...HUMBOLDT...AND POCAHONTAS.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 5 AM FOR THE
FOLLOWING COUNTIES IN THE DES MOINES COUNTY WARNING AREA...

WORTH...HANCOCK...CERRO GORDO...WRIGHT...FRANKLIN...BUTLER...
BREMER...SAC...CALHOUN...WEBSTER...HAMILTON...HARDIN...GRUNDY...
BLACKHAWK...CRAWFORD...CARROLL...GREENE...BOONE...STORY...MARSHALL...
AND TAMA COUNTIES.

SOME OF THESE COUNTIES WERE IN THE SEVERE THUNDERSTORM WATCH THAT
WAS IN EFFECT UNTIL 1 AM.  THE FOLLOWING COUNTIES ARE NOW IN THE
SEVERE THUNDERSTORM WATCH THAT IS IN EFFECT UNTIL 5 AM...

WORTH...HANCOCK...CERRO GORDO...WRIGHT...FRANKLIN...AND BUTLER.

MONITOR YOUR FAVORITE WEATHER INFORMATION SOURCE FOR LATER UPDATES
AND POSSIBLE WARNINGS.

SEARCY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 11:22 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	38 min
Aug 8, 2:54 AM CDT	Severe Thunderstorm Warning	DMX	Greene	51 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; the sounding from the Mesonet's radiosonde archive.