Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 2, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 26, 1987, 8:40 PM CDT for Marshall County, Story County, Iowa. It was in force for 45 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
- Apr 26, 1987, 8:40 PM CDT (01:40 UTC)
- Expired
- Apr 26, 1987, 9:25 PM CDT
- In force
- 45 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Marshall County, IA, Story 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 |
|---|---|---|---|
| Apr 26, 9:02 PM CDT | Hail 1 | Story, 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
Omaha, NE (KOAX), launched 00:00Z, 1.7 hours before the alert went out and 272 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
- 83 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 3542 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 97 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 270140 SVRDSM IAC169-127-270225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 840 PM CDT SUN APR 26 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 925 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF CENTRAL IOWA...EASTERN STORY AND WESTERN MARSHALL AT 840 PM CDT...WEATHER RADAR IN DES MOINES INDICATED A SEVERE THUNDERSTORM OVER SOUTHEAST HAMILTON COUNTY...ABOUT 15 MILES NORTH OF AMES. THE STORM WAS MOVING SOUTHEAST AT 30 TO 35 MILES AN HOUR...AND WILL MOVE THROUGH COLO AND STATE CENTER BETWEEN 900 PM AND 925 PM. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS zOF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. PEOPLE IN THE PATH OF THIS STORM SHOULD TAKE APPROPRIATE ACTION IMMEDIATELY. SCHUMACHER/SCOTT
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, Apr 26, 5:51 PM CDT, 2 hours 49 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 PM CDT SUN APR 26 1987 AT 535 PM...THUNDERSTORMS WITH VERY HEAVY RAINS AND PERHAPS SMALL HAIL DEVELOPED IN NORTHWEST IOWA NEAR SPENCER. WIND GUSTS TO 50 MILES AN HOUR CAN ALSO BE EXPECTED WITH THE PASSAGE OF THESE STORMS. OTHER SHOWERS AND THUNDERSTORMS IN THIS AREA WERE LOCATED ALONG A LINE EXTENDING FROM CHEROKEE TO ESTHERVILLE. A FEW SHOWERS AND THUNDERSTORMS WERE ALSO LOCATED IN SOUTHWEST IOWA BETWEEN OSCEOLA...ABOUT 30 MILES SOUTH OF DES MOINES...AND RATHBUN RESERVOIR. THE SHOWERS AND THUNDERSHOWERS WERE MOVING SOUTHEAST AT 40 MILES AN HOUR. SCOTT
Special weather statement, Apr 26, 6:06 PM CDT, 2 hours 34 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 610 PM CDT SUN APR 26 1987 AT 610 PM RADAR INDICATED A STRONG THUNDERSTORM WITH HEAVY RAIN AROUND BANCROFT IN KOUSSUTH COUNTY...AROUND 50 MILES TO THE NORTH WEST OF MASON CITY. THIS STORM WILL MOVE INTO THE TIKONKA AND SEXTON AREAS OR AROUND 10 MILES TO THE NORTH AND EAST OF ALGONA BETWEEN 615PM AND 645 PM. STRONG WINDS OF 40 TO 50 MILES AN HOUR ALONG WITH SOME SAMLL HAIL MAY ACCOMPANY THIS STORM. THE STORM WAS MOVING SOUTHEAST AT 30 TO 35 MILES AN HOUR. WEINBRECHT
Special weather statement, Apr 26, 6:23 PM CDT, 2 hours 17 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 624 PM CDT SUN APR 26 1987 AT 620 PM RADAR INDICATED A STRONG THUNDERSTORM LOCATED JUST NORTHEAST OF ALGONA IN KOSSUTH COUNTY...AROUND 50 MILES WEST OF MASON CITY. SHERIFF REPORTS INDICATED THAT HAIL JUST SMALLER THAN GOLF BALL SIZE OCCURRED IN THE TOWN OF BURT AT 610 PM THIS EVENING. DURING THE PAST FEW MINUTES...THE STORM WAS SHOWING SIGNS OF WEAKENING. IT WILL STILL PRODUCE VERY HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS OF 40 TO 50 MILES AN HOUR. THE STORM WAS MOVING SOUTHEAST AT 40 MILES AN HOUR AND WILL MOVE INTO SOUTHWEST HANCOCK COUNTY BY 640 PM THIS EVENING. SCHUMACHER
Special weather statement, Apr 26, 6:52 PM CDT, 1 hour 48 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 645 PM CDT SUN APR 26 1987 AT 630 PM RADAR INDICATED A STRONG THUNDERSTORM LOCATED NEAR EMMETSBURG IN PALO ALTO COUNTGY...AROUND 50 MILES WEST OF MASON CITY. VERY HEAVY RAINS...STRONG GUSTY SURFACE WINDS TO AROUND 50 MILES AN HOUR...AND HAIL CAN BE EXPECTED WITH THE PASSAGE OF THIS STORM. OTHER STRONG THUNDER- STORMS WERE LOCATED IN THIS AREA BETWEEN STORM LAKE AND THE MINNESOTA BORDER NORTH OF MASON CITY. SHERIFF REPORTS INDICATED THAT HAIL JUST SMALLER THAN GOLF BALL SIZE OCCURRED IN THE TOWN OF BURT AT 610 PM THIS EVENING. A FEW SHOWERS AND THUNDERSTORMS WERE ALSO LOCATED IN SOUTH CENTRAL IOWA IN THE VICINITY OF RATHBUN RESERVOIR. THE STORMS WERE MOVING SOUTHEAST AT 40 MILES AN HOUR. SCOTT
Special weather statement, Apr 26, 7:46 PM CDT, 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 745 PM CDT SUN APR 26 1987 AT 730 PM RADAR INDICATED A STRONG THUNDERSTORM LOCATED IN NORTH CENTRAL IOWA ABOUT 15 MILES SOUTHWEST OF MASON CITY. SCATTERED SHOWERS AND THUNDERSHOWERS WERE ALSO LOCATED IN THE REMAINDER OF NORTH CENTRAL IOWA AND EXTENDED INTO NORTHWEST IOWA. THESE SHOWERS AND THUNDERSTORMS HAD DECREASED IN INTENSITY SINCE 6 30PM. NO SEVERE =WEATHER HAS BEEN REPORTED IN THIS AREA SINCE 6 30PM. THE SHOWERS AND THUNDERSTORMS THAT WERE LOCATED IN SOUTH CENTRAL IOWA HAD MOVED INTO NORTHEAST MISSOURI. THE STORMS WERE MOVING SOUTHEAST AT 40 MILES AN HOUR. SCOTT
Special weather statement, Apr 26, 8:00 PM CDT, 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 805 PM CDT SUN APR 27 1987 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR CENTRAL AND EASTERN IOWA UNTIL MIDNIGHT... AT 755 PM RADAR INDICATED A STRONG THUNDERSTORM WITH HEAVY RAIN IN SOUTHEAST WRIGHT COUNTY OR 30 MILES TO THE NORTHEAST OF FORT DODGE. THIS STORM IS CAPABLE OF PRODUCING HEAVY RAIN AND SMALL HAIL AS IT MOVES SOUTHEAST INTO NORTHERN HAMILTON...NORTHERN HARDIN ANKD SOUTHWEST FRANKLIN COUNTIES BETWEEN 8 PM AND 845 PM. AT 745 PM PEA TO MARBLE SIZE HAIL OCCURRED AT CLARION IN WRIGHT COUNTY. WEINBRECHT
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:23 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 24 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.