Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 140, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 30, 1990, 10:20 AM CDT for Van Buren County, Iowa. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- Jun 30, 1990, 10:20 AM CDT (15:20 UTC)
- Expired
- Jun 30, 1990, 10:45 AM CDT
- In force
- 25 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Van Buren County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 3.3 hours before the alert went out and 376 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3663 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 301523
SVRDSM
IAC177-301545-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1020 AM CDT SAT JUN 30 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1045 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHEAST IOWA
...SOUTHERN VAN-BUREN
AT 1018 AM...WEATHER RADAR CONTINUED TO INDICATE A SMALL CLUSTER OF
SEVERE THUNDERSTORMS OVER EXTREME SOUTHERN VAN BUREN COUNTY IN THE
MOUNT STERLING AND CANTRILL VICINITIES. THIS IS ABOUT 40 MILES
SOUTHEAST OF OTTUMWA.
THE STORM WAS MOVING SOUTHEAST AT 25 MILES AN HOUR...AND WILL BE
AFFECTING THE MOUNT STERLING...FARMINGTON AND CANTRILL AREAS.
LARGE HAIL IS LIKELY WITH THIS STORM...AS IS BRIEF EXTREMELY HEAVY
RAINS. WINDS OF OVER 60 MILES AN HOUR ARE ALSO POSSIBLE.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
TRUETT/BARLOWWhat 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 30, 5:38 AM CDT, 4 hours 42 minutes before
IAZ001>015-301400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 540 AM CDT SAT JUN 30 1990 DENSE FOG HAS FORMED OVER PARTS OF NORTH CENTRAL INTO NORTHEAST AND EAST CENTRAL IOWA EARLY THIS MORNING. VISIBILITIES WERE NEAR ZERO TO ONLY A FEW HUNDRED FEET IN MANY AREAS. VISIBILITIES SHOULD IMPROVE CONSIDERABLY BETWEEN 8 AND 9AM THIS MORNING BUT IN THE MEANTIME TRAVELERS IN THESE AREAS SHOULD BE EXTRA CAREFUL...SLOW DOWN...AND UcSE THEIR LOW BEAM HEADLIGHTS. ADAMS
Special weather statement, Jun 30, 9:29 AM CDT, 51 minutes before
SPECIAL STATEMENT AND IOWA WEATHER UPDATE NATIONAL WEATHER SERVICE DES MOINES IA 925 AM CDT SAT JUN 30 1990 AT 915 AM...THUNDERSTORMS CONTINUED OVER EXTREME SOUTHEAST IOWA SOME 20 MILES WEST AND SOUTHWEST OF BURLINGTON. ALTHOUGH THESE STORMS HAVE APPEARED TO WEAKEN SINCE 835...THEY STILL COULD PRODUCE HAIL AND VERY HEAVY RAIN. ISOLATED LIGHT SHOWERS HAD POPPED UP AROUND THE OTTUMWA AREA. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. OVER THE REST OF THE STATE VARIABLY CLOUDY SKIES WERE REPORTED. DENSE FOG WAS BEING REPORTED OVER PARTS OF EAST CENTRAL AND NORTHEAST IOWA. THE OUTLOOK THROUGH 11AM...SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THE FAR SOUTHEAST COUNTIES...SKIES SHOULD BECOME MOSTLY SUNNY OVER THE NORTHERN TWO THIRDS OF THE STATE AND THE FOG OVER THE EAST CENTRAL AND NORTHEAST SHOULD SLOWLY DISSIPATE. BARLOW
Special weather statement, Jun 30, 9:53 AM CDT, 27 minutes before
IAZALL-301530- SPECIAL STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 950 AM CDT SAT JUN 30 1990 AT 935 AM...INTENSE THUNDERSTORMS HAVE ONCE AGAIN REGENERATED OVER EXTREME SOUTHEAST IOWA...IN VAN BUREN COUNTY SOME 35 MILES SOUTHEAST OF OTTUMWA. LARGE HAIL AND VERY HEAVY RAIN ALONG WITH FREQUENT DEADLY LIGHTNING CAN BE EXPECTED ONCE AGAIN IN THIS AREA. THESE STORMS WERE PART OF A 10 TO 20 MILE WIDE BAND OF THUNDERSTORMS THAT EXTENDED FROM 10 MILES SOUTH OF OTTUMWA SOUTHEAST TO ABOUT 10 MILES WEST THROUGH SOUTH OF BURLINGTON. PEOPLE LIVING IN EASTERN DAVIS COUNTY...VAN BUREN AND LEE COUNTIES SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AS THE STORMS NOW LOCATED IN YOUR COUNTIES HAVE SHOWN A TENDENCY TO RAPIDLY DEVELOP AND THEN DISSIPATE. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 7:44 PM CDT | Tornado Warning | DMX | Wright | 40 min |
| Jun 30, 8:24 AM CDT | Severe Thunderstorm Warning | DMX | Van Buren | 36 min |
| Jun 30, 9:39 AM CDT | Severe Thunderstorm Warning | DMX | Van Buren | 36 min |
| Jun 30, 1:05 PM CDT | Flash Flood Warning | DMX | Davis, Van Buren | 4 hr |
| Jun 30, 1:30 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Van Buren | 45 min |
| Jun 30, 2:53 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 37 min |
| Jun 30, 3:08 PM CDT | Severe Thunderstorm Warning | DMX | Madison | 37 min |
| Jun 30, 3:23 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas | 37 min |
| Jun 30, 3:30 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 30 min |
| Jun 30, 3:42 PM CDT | Tornado Warning | DMX | Madison, Warren | 33 min |
| Jun 30, 4:01 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Union | 44 min |
| Jun 30, 4:19 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 41 min |
| Jun 30, 4:36 PM CDT | Severe Thunderstorm Warning | DMX | Decatur | 54 min |
| Jun 30, 4:39 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 51 min |
| Jun 30, 4:42 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Union | 48 min |
| Jun 30, 4:57 PM CDT | Tornado Warning | DMX | Decatur | 33 min |
| Jun 30, 5:00 PM CDT | Flash Flood Warning | DMX | Mahaska | 4 hr |
| Jun 30, 5:03 PM CDT | Tornado Warning | DMX | Adams, Union | 27 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1990Every severe thunderstorm warning in 1990
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.