Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 6, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 13, 1987, 9:17 PM CDT for Clay County, Palo Alto County, Iowa. It was in force for 23 min.
The area
The counties it named.
The facts
- Issued
- May 13, 1987, 9:17 PM CDT (02:17 UTC)
- Expired
- May 13, 1987, 9:40 PM CDT
- In force
- 23 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Clay County, IA, Palo Alto 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
Minneapolis, MN (KSTC), launched 00:00Z, 2.3 hours before the alert went out and 223 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
- 732 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 1878 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 191 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
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, May 13, 4:56 PM CDT, 4 hours 21 minutes before
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</html>Special weather statement, May 13, 5:37 PM CDT, 3 hours 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 540 PM CDT WED MAY 13 1987 ...SEVERE THUNDERSTORM WATCH FOR EXTREME NORTHWEST IOWA UNTIL 9 PM.... THE NATIONAL WEATHER SERVICE RADAR IN DES MOINES WAS NOT INDICATING ANY PRECIPITATION IN IOWA AS OF 530 PM. HOWEVER THUNDERSTORMS WERE DEVELOPING OVER PARTS OF NORTHEAST NEBRASKA...SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA. THESE THUNDERSTORMS ARE EXPECTED TO MOVE INTO NOR.THWEST IOWA THIS EVENING. FERRY
Special weather statement, May 13, 6:39 PM CDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 635 PM CDT WED MAY 13 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL 11 PM... AT 630 PM... THE ONLY PRECIPITATION INDICATED IN IOWA WAS AN ISOLATED THUNDER/ SHOWER IN NORTH CENTRAL IOWA...15 MILES NORTHEAST OF FORT DODGE. THIS THUNDERSHOWER HAD DEVELOPED SINCE 600 PM. THE MOVEMENT OF THE THUNDER/ SHOWER HAS NOT BEEN DETERMINED. A LINE OF THUNDERSTORMS CONTINUES TO DEVELOP OVER PARTS OF NORTHEAST NEBRASKA...SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA. THE STORMS LOCATED IN SOUTHEAST SOUTH DAKOTA SHOULD MOVE EAST INTO EXTREME NORTH/ WEST IOWA BEFORE 730 PsM. FERRY
Special weather statement, May 13, 7:35 PM CDT, 1 hour 42 minutes before
KDSM 140034 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 735 PM CDT WED MAY 13 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL 11 PM... AT 730 PM... WIDELY SCATTERED THUNDERSTORMS HAD ENTERED THE NORTHWEST CORNER OF IOWA. THE THUNDERSTORMS WERE LOCATED ABOUT 40 MILES NORTH OF SIOUX CITY...AND ANOTHER THUNDERSTORM WAS LOCATED ABOUT 30 MILES WEST OF SPIRIT LAKE. THE THUNDERSTORM IN NORTH CENTRAL IOWA HAD DISSIPATED. THE THUNDERSTORMS WERE MOVING EAST AT 25 MILES AN HOUR. BRUCE
Special weather statement, May 13, 8:42 PM CDT, 35 minutes before
KDSM 140034 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 840 PM CDT WED MAY 13 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL 11 PM... AT 830 PM... SCATTERED THUNDERSTORMS WERE LOCATED IN NORTHWEST IOWA. THE THUNDERSTORMS WERE ALONG A LINE FROM ESTHERVILLE TO SIOUX CITY. THE STRONGEST STORM WAS ABOUT 40 MILES NORTHEAST OF SIOUX CITY. THESE STORMS WERE P9ART OF A LINE OF STORMS REACHING FROM NORTHEAST NEBRASKA INTO SOUTH CENTRAL MINNESOTA. THE THUNDERSTORMS WERE MOVING EAST AT 35 MILES AN HOUR. BRUCE
Special weather statement, May 13, 8:57 PM CDT, 20 minutes before
KDSM 140034 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 855 PM CDT WED MAY 13 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL 11 PM... RADAR INDICATED VERY STRONG THUNDERSTORMS OVER DICKINSON AND NORTHEAST OBRIEN COUNTIES IN NORTHWEST IOWA. THESE THUNDERSTORMS WERE LOCATED FROM 5 MILES WEST OF ESTHERVILLE TO 20 MILES NORTHWEST OF SPENCER NEAR HARTLEY. THESE STORMS WERE MOVING TO THE EAST AT 35 MILES AN HOUR. PERSONS IN NORTHERN CLAY AND SOUTHEAST DICKENSON AND WESTERN EMMET COUNTIES CAN EXPECT THE PASSAGE OF THESE STORMS BY 845 PM. WIND GUSTS OF 40 TO 50 MILES AN HOUR....BRIEF HEAVY RAINS AND SMALL HAIL ARE POSSIBLE FROGM THESE STORMS. FERRY
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 9:57 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth | 25 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1987Every severe thunderstorm warning in 1987
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.