Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 39, NWS Quad Cities, IA

June 29, 1993Clayton County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 29, 1993, 8:59 PM CDT for Clayton County, Iowa. It was in force for 31 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1993, 8:59 PM CDT (01:59 UTC)
Expired
Jun 29, 1993, 9:30 PM CDT
In force
31 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Clayton County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 2.0 hours before the alert went out and 287 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, Minneapolis, MN at 00:00Z on 1993-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 1993-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
679 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
311 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

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.

In the hours before

Special weather statement, Jun 29, 6:32 PM CDT, 2 hours 27 minutes before
IAZ030-041-042-053-054-ILZ001-WIZ018-300030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
632 PM CDT TUE JUN 29 1993

...A TORNADO WATCH IS IN EFFECT FOR CLAYTON AND DELAWARE COUNTIES UNTIL
1100 PM...

...A FLASH FLOOD WATCH IS IN EFFECT FOR TONIGHT FOR CLAYTON COUNTY...

AT 625 PM RADAR INDICATED NO THUNDERSTORMS OR SHOWERS IN THE TRI-STATES.
TO THE WEST OF THE TRI-STATES JUST TO THE WEST OF WATERLOO AND NEAR
CEDAR FALLS THERE WAS A SCATTERED AREA OF SHOWERS AND THUNDERSTORMS.

ALL THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR.

A TORNADO WATCH IS IN EFFECT UNTIL 1100 PM FOR BOTH CLAYTON AND
DELAWARE COUNTIES. A FLASH FLOOD WATCH IS IN EFFE~CT FOR CLAYTON
COUNTY FOR TONIGHT.

PERSONS IN THE WATCH AREAS SHOULD KEEP ABREAST OF THE CHANGING
WEATHER CONDITIONS AND PLAN NOW WHAT YOU WILL DO SHOULD DANGEROUS
WEATHER CONDITIONS DEVELOP.

ROWLAND

NNNN
Special weather statement, Jun 29, 6:32 PM CDT, 2 hours 27 minutes before
IAZ030-041-042-053-054-ILZ001-WIZ018-300030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
632 PM CDT TUE JUN 29 1993

...A TORNADO WATCH IS IN EFFECT FOR CLAYTON AND DELAWARE COUNTIES UNTIL
1100 PM...

...A FLASH FLOOD WATCH IS IN EFFECT FOR TONIGHT FOR CLAYTON COUNTY...

AT 625 PM RADAR INDICATED NO THUNDERSTORMS OR SHOWERS IN THE TRI-STATES.
TO THE WEST OF THE TRI-STATES JUST TO THE WEST OF WATERLOO AND NEAR
CEDAR FALLS THERE WAS A SCATTERED AREA OF SHOWERS AND THUNDERSTORMS.

ALL THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR.

A TORNADO WATCH IS IN EFFECT UNTIL 1100 PM FOR BOTH CLAYTON AND
DELAWARE COUNTIES. A FLASH FLOOD WATCH IS IN EFFECT FOR CLAYTON
COUNTY FOR TONIGHT.

PERSONS IN THE WATCH AREAS SHOULD KEEP ABREAST OF THE CHANGING
WEATHER CONDITIONS AND PLAN NOW WHAT YOU WILL DO SHOULD DANGEROUS
WEATHER CONDITIONS DEVELOP.

ROWLAND

NNNN

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 7:47 PM CDTFlash Flood WarningDVNClayton12 hr
Jun 29, 9:51 PM CDTSevere Thunderstorm WarningDVNClayton, Delaware54 min
Jun 29, 10:06 PM CDTSevere Thunderstorm WarningDVNJones54 min
Jun 29, 10:23 PM CDTSevere Thunderstorm WarningDVNDubuque37 min
Jun 29, 10:47 PM CDTSevere Thunderstorm WarningDVNCedar43 min
Jun 29, 10:52 PM CDTSevere Thunderstorm WarningDVNJackson68 min
Jun 29, 11:03 PM CDTFlash Flood WarningDVNJones115 min
Jun 29, 11:11 PM CDTSevere Thunderstorm WarningDVNMuscatine, Scott49 min
Jun 29, 11:11 PM CDTSevere Thunderstorm WarningDVNClinton49 min
Jun 29, 11:36 PM CDTFlash Flood WarningDVNJackson82 min
Jun 29, 11:48 PM CDTSevere Thunderstorm WarningDVNJackson57 min
Jun 29, 11:54 PM CDTSevere Thunderstorm WarningDVNJackson51 min
Jun 30, 12:04 AM CDTSevere Thunderstorm WarningDVNJones26 min
Jun 30, 12:06 AM CDTSevere Thunderstorm WarningDVNDes Moines, Lee54 min
Jun 30, 1:35 AM CDTFlash Flood WarningDVNScott3 hr
Jun 30, 7:44 AM CDTFlash Flood WarningDVNClayton3 hr
Jun 30, 6:25 PM CDTFlash Flood WarningDVNClayton14 hr
Jun 29, 11:36 PM CDTSevere Thunderstorm WarningDVNMercer, Rock Island69 min
Jun 30, 12:06 AM CDTSevere Thunderstorm WarningDVNHenry54 min
Jun 30, 12:17 AM CDTSevere Thunderstorm WarningDVNHenry, Whiteside58 min
Jun 30, 1:35 AM CDTFlash Flood WarningDVNHenry3 hr
Jun 30, 12:14 AM CDTSevere Thunderstorm WarningDVNLafayette44 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993Every severe thunderstorm warning in 1993

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.