Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 107, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 27, 1990, 2:22 PM CDT for Mitchell County, Iowa. It was in force for 53 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 27, 1990, 2:22 PM CDT (19:22 UTC)
- Expired
- Jun 27, 1990, 3:15 PM CDT
- In force
- 53 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Mitchell 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 27, 2:40 PM CDT | Hail 3 | Mitchell, 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 12:00Z, 7.4 hours before the alert went out and 178 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
- 2 J/kg
- Mixed-layer CIN
- -429 J/kg
- Mixed-layer LCL
- 1514 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 27, 1:39 PM CDT, 43 minutes before
IAZALL-271930- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IOWA 140 PM CDT WED JUN 27 1990 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PART OF NORTH CENTRAL AND NORTHEAST IOWA UNTIL 8 PM CDT THIS EVENING... AT 130 PM...A STRONG THUNDERSTORM HAD MOVED INTO THE MINNESOTA/IOWA BORDER AREA 30 MILES NORTHEAST OF MASON CITY. THIS STORM IS CAPABLE OF PRODUCING HEAVY RAINFALL...SMALL HAIL...AND GUSTY WINDS TO 40 MILES AN HOUR. THIS STORM WAS MOVING SOUTHEAST AT 25 MILES AN HOUR. DM
Special weather statement, Jun 27, 2:15 PM CDT, 7 minutes before
IAZ002-003-007-272000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 210 PM CDT WED JUN 27 1990 AT 210 PM CDT...SHOWERS AND STRONG THUNDERSTORMS WERE MOVING INTO IOWA ALONG THE MINNESOTA BORDER...JUST NORTH OF MASON CITY...THEN EAST TO THE MISSISSIPPI RIVER. ELSEWHERE IT WAS HOT AND HUMID FROM DECORAH TO MASON CITY TO HAMPTON TO THE WATERLOO AREA. THE TEMPERATURES WERE IN THE LOWER 90S UNDER A CLOUD/SUN MIX. THE WINDS WERE SOUTHERLY AROUND 10 MILES AN HOUR. THE SHOWERS AND THUNDERSTORMS ARE MOVING SOUTHEAST AT AROUND 30 MILES AN HOUR AND SHOULD AFFECT THE OSAGE AND CRESCO AREAS BY 310 PM. AS THESE STORMS MOVE SOUTH THE TEMPERATURES ASSOCIATED WITH THE THUNDERSTORMS WILL DROP RAPIDLY ABOUT 15 TO 20 DEGREES. SOUTH OF HIGHWAY 18 WE WILL HAVE A CLOUD/SUN WITH TEMPERATURES IN THE 90S AND SOUTHERLY WINDS 5 TO 15 MILES AN HOUR.
Special weather statement, Jun 27, 2:15 PM CDT, 7 minutes before
IAZALL-272000- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA NATIONAL WEATHER SERVICE DES MOINES IOWA 215 PM CDT WED JUN 27 1990 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A LARGE PART OF NORTH CENTRAL AND NORTHEAST IOWA UNTIL 8 PM CDT THIS EVENING... AT 205 PM...A COUPLE OF STRONG THUNDERSTORMS HAD MOVED INTO EXTREME NORTHEAST IOWA ALONG THE MINNESOTA BORDER. THE STORMS WERE LOCATED 15 TO 30 MILES NORTHEAST OF MASON CITY NEAR THE COMMUNITIES OF NORTHWOOD AND OSAGE. THESE STORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL...SMALL HAIL...AND GUSTY WIND TO 40 MILES AN HOUR. THE STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. THE REMAINDER OF THE STATE WAS GENERALLY PARTLY SUNNY WITH TEMPERATURES IN THE 90S OVER MUCH OF THE STATE. / THE ONE TO TWO HOUR OUTLOOK IS FOR THE STORMS NORTHEAST OF MASON CITY TO CONTINUE MOVING SOUTHEAST INTO FAR NORTHEAST IOWA. DM
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 7:15 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie | 30 min |
| Jun 26, 8:18 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 27 min |
| Jun 26, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Union | 27 min |
| Jun 26, 9:00 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Grundy | 35 min |
| Jun 27, 2:52 PM CDT | Severe Thunderstorm Warning | DMX | Floyd | 68 min |
| Jun 27, 3:09 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 36 min |
| Jun 27, 3:43 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 32 min |
| Jun 27, 3:44 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler | 61 min |
| Jun 27, 4:09 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 66 min |
| Jun 27, 5:08 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Tama | 52 min |
| Jun 27, 5:48 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 30 min |
| Jun 27, 6:12 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 33 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.