Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 65, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 1990, 10:20 PM CDT for Allamakee County, Iowa. It was in force for 40 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 12, 1990, 10:20 PM CDT (03:20 UTC)
- Expired
- Jun 12, 1990, 11:00 PM CDT
- In force
- 40 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Allamakee County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 12, 10:50 PM CDT | Thunderstorm Wind 55 | Allamakee, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 3.3 hours before the alert went out and 249 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
- 1326 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1196 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- -50 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- -0.4
- Supercell composite
- -2.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KALO 130320
SVRALO
IAC005-130400-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
1020 PM CDT TUE JUN 12 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 1100 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE NORTHEAST PART OF IOWA
ALLAMAKEE
AT 1015 WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM
LOCATED 15 MILES SOUTHEAST OF DECORAH AND JUST NORTH OF POSTVILLE.
THIS THUNDERSTORM IS MOVING NORTHEAST AT 40 MILES AN HOUR AND WILL
AFFECT THE WAUKON AND LANSING AREAS. THIS STORM WILL PRODUCE LARGE
HAIL AND DAMAGING WINDS.
YOU SHOULD MOVE INSIDE A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES UNTIL
AFTER THE STORM PASSES.
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.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 12, 8:42 PM CDT, 1 hour 38 minutes before
IAZALL-130300- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 840 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM TONIGHT... ...A TORNADO WATCH IS IN EFFECT FOR WESTERN AND NORTHERN IOWA UNTIL 1 AM WEDNESDAY MORNING... AT 829 PM...ISOLATED INTENSE THUNDERSTORMS WERE OVER NORTH CENTRAL AND NORTHEAST IOWA...FROM 10 TO 35 MILES SOUTHEAST OF MASON CITY. THE STORMS WERE NEAR THE TOWNS OF SHEFFIELD...GREENE AND CLARKSVILLE. IN ADDITION TO THE EXCESSIVE RAINS...BRIEF STRONG WINDS AND LARGE HAIL ARE MOST LIKELY OCCURRING WITH THESE STORMS. THE STORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR AND WILL MOVE INTO THE ROCKFORD...MARBLE ROCK AND NASHUA AREAS BETWEEN 9 - 930 PM. / ALSO...SCATTERED SHOWERS AND THUNDERSTORMS WERE OVER THE NORTH CENTRAL AND NORTHEAST COUNTIES...NORTH OF A FORT DODGE/WATERLOO LINE. KS/WPM
Special weather statement, Jun 12, 9:17 PM CDT, 1 hour 3 minutes before
IAZALL-130330- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 916 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM TONIGHT... ...A TORNADO WATCH IS IN EFFECT FOR WESTERN AND NORTHERN IOWA UNTIL 1 AM WEDNESDAY MORNING... AT 908 PM...INTENSE THUNDERSTORMS CONTINUED IN PART OF NORTH CENTRAL AND NORTHEAST IOWA. THE STORMS EXTENDED FROM MASON CITY TO 25 MILES NORTH OF WATERLOO. HEAVY RAIN...STRONG WIND...LARGE HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THE STROGEST STORMS. OTHER VERY HEAVY THUNDERSTORMS HAD DEVELOPED ACROSS NORTHWEST IOWA. THE STRONGEST STORM WAS LOCATED IN NORTHERN OBRIEN COUNTY...55 MILES NORTHEAST OF SIOUX CITY. THE STORMS IN THIS AREA COULD ALSO PRODUCE HEAVY RAIN...HAIL AND STRONG WIND. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR. PERSONS IN THE SPIRIT LAKE AND ESTHERVILLE AREAS CAN EXPECT BSHOWERS AND THUNDERSTORMS BY 845 PM. THUNDERSTORMS WILL CONTINUE ACROSS THE EXTREME NORTH CENTRAL AND NORTHEAST PART OF THE STATE. JAH
Special weather statement, Jun 12, 9:29 PM CDT, 51 minutes before
IAZALL-130600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 930 PM CDT TUE JUN 12 1990 THE TORNADO WATCH NUMBER 247 IS NO LONGER IN EFFECT FOR THE FOLLOWING COUNTIES IN CENTRAL...SOUTHWEST...AND EAST CENTRAL IOWA. THOSE COUNTIES THAT ARE NO LONGER INCLUDED IN THE WATCH ARE... CRAWFORD CARROLL GREENE BOONE STORY MARSHALL DALLAS POLK JASPER POWESHIEK MADISON WARREN MARION CASS ADAIR MONTGOMERY ADAMS PAGE TAYLOR UNION RINGGOLD DECATUR LUCAS WAYNE TAMA BENTON LINN JOHNSON IOWA AUDOBON SHELBY GUTHRIE A TORNADO WATCHES REMAIN IN EFFECT FOR NORTHEAST IOWA UNTIL 11 PM...AND FOR NORTHWEST IOWA UNTIL 100 AM CDT WEDNESDAY MORNING. IN ADDITION...A SEVERE THUNDERSTORM WATCH IS ARE IN EFFECT FOR PARTS OF NORTHEASTT IOWA UNTIL MIDNIGHT. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP AND MOVE INTO WESTERN AND SOUTHWEST IOWA LATERJ TONIGHT. ...NOTE TO BROADCASTERS... THE NATIONAL WEATHER SERVICE HAS EXTENDED THE TORNADO WATCH NUMBER 247 FOR NORTHEAST IOWA UNTIL 1100 AM TONIGHT. MCQUIRTER
Special weather statement, Jun 12, 9:37 PM CDT, 43 minutes before
IAZALL-130600- SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE DES MOINES IA 935 PM CDT TUE JUN 12 1990 THE TORNADO WATCH NUMBER 247 IS NO LONGER IN EFFECT FOR THE FOLLOWING COUNTIES IN CENTRAL...SOUTHWEST...AND EAST CENTRAL IOWA. THOSE COUNTIES THAT ARE NO LONGER INCLUDED IN THE WATCH ARE... CRAWFORD CARROLL GREENE BOONE STORY MARSHALL DALLAS POLK JASPER POWESHIEK MADISON WARREN MARION CASS ADAIR MONTGOMERY ADAMS PAGE TAYLOR UNION RINGGOLD DECATUR LUCAS WAYNE TAMA BENTON LINN JOHNSON IOWA AUDOBON SHELBY GUTHRIE A TORNADO WATCHES REMAIN IN EFFECT FOR NORTHEAST IOWA UNTIL 11 PM...AND FOR NORTHWEST IOWA UNTIL 100 AM CDT WEDNESDAY MORNING. IN ADDITION...A SEVERE THUNDERSTORM WATCH IS ARE IN EFFECT FOR THE FAR NORTHEAST COUNTIES UNTIL 11PM. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP AND MOVE INTO WESTERN AND SOUTHWWEST IOWA LATER TONIGHT. ...NOTE TO BROADCASTERS... THE NATIONAL WEATHER SERVICE HAS EXTENDED THE TORNADO WATCH NUMBER 247 FOR NORTHEAST IOWA UNTIL 1100 AM TONIGHT. MCQUIRTER
Special weather statement, Jun 12, 9:44 PM CDT, 36 minutes before
IAZALL-130400- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 943 PM CDT TUE JUN 12 1990 ...SEVERE THUNDERSTORM WATCH FOR FAR NORTHEAST IOWA UNTIL 11PM... ...A TORNADO WATCH NORTH CENTRAL AND NORTHEAST IOWA UNTIL 11PM... ...A TORNADO WATCH WESTERN IOWA UNTIL 1AM WEDNESDAY MORNING... AT 926 PM...INTENSE THUNDERSTORMS CONTINUED IN PART OF NORTH CENTRAL AND NORTHEAST IOWA. A SEVERE THUNDERSTORM WAS INDICATED IN FLOYD COUNTY...ABOUT 20 MILES EAST OF MASON CITY. AN ITENSE THUNDERSTORM WAS INDICATED JUST SOUTH OF NEW HAMPTON...OR ABOUT 30 MILES NORTH OF WATERLOO. OTHER SHOWERS AND THUNDERSTORMS WERE IN A 50 MILE WIDE AREA THAT EXTENDED FROM 30 MILES NORTHWEST OF MASON CITY...TO 30 MILES NORTHEAST OF WATERLOO. IN NORTHWEST IOWA...AN INTENSE THUNDERSTORM WAS INDICATED ABOUT 15 MILES SOUTHEAST OF SPIRIT LAKE. OTHER WEAKER THUNDERSTORMS WERE INDICATED FROM 15 MILES EAST OF SIOUX CITY...TO 40 MILES NORTHEAST OF SIOUX CITY. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR. PERSONS IN THE SPIRIT LAKE AND ESTHERVILLE AREAS CAN EXPECT SHOWERS AND THUNDERSTORMS BY 900 PM. INTENSE THUNDERSTORMS WILL CONTINUE ACROSS NORTHEAST IOWA. ^ JAH
Special weather statement, Jun 12, 10:17 PM CDT, 3 minutes before
IAZALL-130430- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1016 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH EXTREME NORTHEAST UNTIL 11PM... ...A TORNADO WATCH WESTERN IOWA UNTIL 1AM WEDNESDAY MORNING... AT 1006 PM...INTENSE THUNDERSTORMS CONTINUED IN EXTREME NORTHEAST IOWA. ONE STORM WAS INDICATED 10 MILES NORTHEAST OF NEW HAMPTON... WITH ANOTHER LOCATED NEAR POSTVILLE...45 MILES NORTHEAST OF WATERLOO. THE STORMS WILL PRODUCE EXCESSIVE RAINFALL...HIGH WIND AND HAIL. AT 9PM...3 INCHES OF RAIN FELL DURING A 30 MINUTE PERIOD 5 MILES EAST OF GREENE...IN NORTHERN BUTLER COUNTY OF NORTHEAST IOWA. AT THE SAME TIME...1.45 INCHES OF RAIN FELL AT HAMPTON...IN FRANKLIN COUNTY...IN A 15 MINUTE PERIOD. PERSONS IN EXTREME NORTHEAST IOWA CAN EXPECT THUNDERSTORMS WITH HAIL... HIGH WIND...AND EXCESSIVE RAINFALL CAUSING LOW LYING FLOODING THROUGH MIDNIGHT. IN NORTHWEST IOWA...HEAVY THUNDERSTORMS WERE LOCATED 10 MILES SOUTH OF SPENCER...AND ALONG THE IOWA-MINNESOTA BORDER NEAR SPIRIT LAKE. THESE STORMS COULD PRODUCE BRIEF...VERY HEAVY RAINFALL...HIGH WIND AND HAIL. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR. HUTTON
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 7:16 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 13 min |
| Jun 12, 7:16 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton | 44 min |
| Jun 12, 7:26 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 44 min |
| Jun 12, 7:36 PM CDT | Severe Thunderstorm Warning | DMX | Mitchell | 69 min |
| Jun 12, 8:10 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Floyd, Franklin | 35 min |
| Jun 12, 8:45 PM CDT | Severe Thunderstorm Warning | DMX | Chickasaw | 60 min |
| Jun 12, 9:23 PM CDT | Tornado Warning | DMX | Floyd | 37 min |
| Jun 12, 9:49 PM CDT | Severe Thunderstorm Warning | DMX | Winneshiek | 56 min |
| Jun 12, 9:49 PM CDT | Severe Thunderstorm Warning | DMX | Fayette | 41 min |
| Jun 12, 9:57 PM CDT | Severe Thunderstorm Warning | DMX | Dickinson | 28 min |
| Jun 12, 10:03 PM CDT | Severe Thunderstorm Warning | DMX | Howard | 57 min |
| Jun 12, 10:03 PM CDT | Severe Thunderstorm Warning | DMX | Chickasaw | 27 min |
| Jun 12, 10:47 PM CDT | Severe Thunderstorm Warning | DMX | Winneshiek | 43 min |
| Jun 13, 2:28 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Greene, Guthrie | 32 min |
| Jun 13, 6:44 PM CDT | Tornado Warning | DMX | Cass | 18 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.