Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 21, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jun 24, 1987, 7:50 PM CDT for Pottawattamie County, Iowa. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Jun 24, 1987, 7:50 PM CDT (00:50 UTC)
- Expired
- Jun 24, 1987, 8:45 PM CDT
- In force
- 55 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Pottawattamie 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 00:00Z, 0.8 hours before the alert went out and 69 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
- 3564 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 79 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 KOMA 250050 SVROMA NEC025-153-IAC129-155-250145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OMAHA NE 750 PM CDT WED JUN 24 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL NEBRASKA...CASS AND SARPY SOUTHWEST IOWA...MILLS AND WESTERN POTTAWATTAMIE AT 747 PM RADAR INDICATED A SEVERE THUNDERSTORM FROM AROUND BELLEVUE SOUTHWEST TOWARDS WEEPING WATER NEBRASKA AROUND ABOUT 30 MILES SOUTH SOUTHWEST OF OMAHA MOVING EAST NORTHEAST AT 30 MPH. MARBLE SIZE HAIL WAS REPORTED WITH THIS STORM AT ELMWOOD AND IN THE BELLEVUE AREA. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA...SO REMEMBER THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO WARNING...SO BE ON THE LOOKOUT. E PEOPLE IN THE WARNED AREA SHOULD GET INTO A REINFORCED SHELTER AND PREPARE FOR DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...AND DANGEROUS LIGHTNING.
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 24, 6:20 PM CDT, 1 hour 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA NE 620 PM CDT WED JUN 24 1987 AT 620 PM CDT RADAR INDICATED A STRONG THUNDERSTORMS DEVELOPING FROM JUST WEST OF BELLEVUE SOUTH TOWARDS WEEPING WATER NEBRASKA OR ABOUT 10 TO 25 MILES SOUTH SOUTHWEST OF THE OMAHA METRO AREA. PEOPLE IN SARPY..CASS..AND DOUGLAS COUNTIES OF EAST NEBRASKA AND WEST POTTAWATTAMIE AND MILLS COUNTY OF WEST IOWA SHOULD BE ALERT FOR POSSIBLE HAIL AND GUSTY WINDS FROM THESE STORMS THROUGH 720 PM CDT. PEA SIZE HAIL WAS REPORTED AT ELMWWOD NEBRASKA WITH THE PASSAGE OF THESE STORMS. OTHER STRONGER STORMS ALSO CONTINUE TO DEVELOP FROM AROUND BLAIR NEBRASKA TO MONDAMIN IOWA ABOUT 25 MILES NORTH OF OMAHA AND JUST SOUTHWEST OF FREMONT OR ABOUT 30 MILES WEST OF OMAHA. TORNADO WATCH NUMBER 258 CONTINUES IN EFFECT UNTIL 1100 PM CDT FOR EAST NEBRASKA AND WEST IOWA. GW
Special weather statement, Jun 24, 6:37 PM CDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA NE 640 PM CDT WED JUN 24 1987 TORDNDO WATCH NUMBER 256 IS NO LONGER IN EFFECT FOR THE FOLLOWING AREAS OF CENTRAL AND EAST NEBRASKA.... < ZONE 3...NORTH CENTRAL BORDER BOYD...BROWN...HOLT...KEYA PAHA...ROCK. < ZONE 4...NORTHEAST BORDER ANTELOPE...CEDAR...KNOX...PIERCE...WAYNE. < ZONE 7...CENTRAL BLAINE...LOUP...CUSTER. < ZONE 8...NORTHEAST CENTRAL GARFIELD...GREELEY...VALLEY...WHEELER. < ZONE 9...NORTHEAST BOONE...MADISON...PLATTE...STANTON. < ZONE 13...SOUTHWEST CENTRAL DAWSON. < ZONE 14...SOUTH CENTRAL BUFFALO...HALL...HOWARD...MERRICK...NANCE...SHERMAN. < ZONE 17...SOUTHWEST BORDER FRONTIER...FURNAS...GOSPER...HARLAN...PHELPS...RED WILLOW. < ZONE 18...SOUTH CENTRAL BORDER ADAMS...FRANKLIN...KEARNEY... < THE LINE OF STRONG THUNDERSTORM HAS MOVED THROUGH THIS AREA AND THE RISK OF SEVER WEATHER HAS ENDED. GW
Special weather statement, Jun 24, 6:52 PM CDT, 58 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA NE 650 PM CDT WED JUN 24 1987 AT 650 PM CDT RADAR INDICATED A STRONG THUNDERSTORMS FROM THE OMAHA COUNCIL BLUFFS AREA SOUTH ABOUT 15 MILES TO WEST OF BELLEVUE NEBRASKA. REPORTS OF PEA TO MARBLE SIZE HAIL AND 35 TO 45 MPH WINDS HAVE BEEN RECEIVED IN THE OMAHA METRO AREA. PEOPLE IN DOUGLAS AND SARPY COUNTY OF EAST NEBRASKA AND POTTAWATTAMIE AND MILLS COUNTY OF WEST IOWA SHOULD BE ALERT FOR THESE CONDITIONS THROUGH 750 PM CDT... TORNADO WATCH NUMBER 258 CONTINUES IN EFFECT UNTIL 1100 PM CDT FOR EAST NEBRASKA AND WEST IOWA. PEOPLE SHOULD FEEP WEATHER ALERT AND BE PREPARED TO SEEK SHELTER IF WEATHER THREATENS. GW
Special weather statement, Jun 24, 7:23 PM CDT, 27 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA NE 720 PM CDT WED JUN 24 1987 AT 720 PM STRONG THUNDERSTORMS CONTINUE TO DEVELOP AND MOVE EAST AT 35 MPH ACROSS EAST NEBRASKA AND WEST IOWA... STRONGEST STORMS POSSIBLE OF CONTAINING 40 TO 50 MPH AND HAIL WERE LOCATED AROUND MISSOURI VALLEY IOWA ABOUT 25 MILES NORTHEAST OF OMAHA.. NEAR ASHLAND NEBRASKA ABOUT 30 MILES SOUTHWEST OF OMAHA AND JUST WEST OF OMAHA. TORNADO WATCH NUMBER 258 C!ONTINUES IN EFFECT UNTIL 1100 PM CDT FOR EAST NEBRASKA AND WEST IOWA. PEOPLE SHOULD FEEP WEATHER ALERT AND BE PREPARED TO SEEK SHELTER IF WEATHER THREATENS. GW
Special weather statement, Jun 24, 7:35 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA NE 735 PM CDT WED JUN 24 1987 AT 735 PM A GUST FRONT WAS MOVING ACROSS THE OMAHA METROPOLITAN AREA. WINDS WILL GUST TO 40 TO 50 MPH AS THIS FRONT MOVES RAPIDLY EASTWARD. NO SEVERE WEATHER HAS BEEN REPORTED...ALTHOUGH THERE HAVE BEEN NUMEROUS REPORTS OF SMALL HAIL AND HEAVY RAIN ALONG WITH THE GUSTY WINDS. TORNADO WATCH NUMBER 258 CONTINUES IN EFFECT UNTIL 1100 PM CDT FOR EAST NEBRASKA9 AND WEST IOWA. PEOPLE SHOULD FEEP WEATHER ALERT AND BE PREPARED TO SEEK SHELTER IF WEATHER THREATENS. POLLACK
Special weather statement, Jun 24, 7:47 PM CDT, 3 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LINCOLN NE 745 PM CDT WED JUN 24 1987 THE THUNDERSTORMS OVER SOUTHEAST NEBRASKA HAVE WEAKENED AND ARE MOVING MUCH MORE RAPIDLY TO THE SOUTHEAST. THE STRONGEST STORMS ARE NOW OVER GAGE COUNTY TO THE SOUTH OF LINCOLN. NO FURTHER REPORTS OF TORNADOS HAVE BEEN RECEIVED AND THE TORNADO WARNING PREVIOUSLY IN EFFECT FOR PARTS OF SALINE, LANCASTER, JEFFERSON AND GAGE COUNTIES WILL EXPIRE AT 745PM. HEAVY BRAIN IS STILL OCCURRING OVER PARTS OF SOUTHEAST NEBRASKA AND LOCAL RUNOFF MAY BE QUITE HEAVY IN SOME LOCATIONS. KENNEL
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 7:28 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 52 min |
| Jun 24, 7:50 PM CDT | Severe Thunderstorm Warning | OAX | Mills | 55 min |
| Jun 24, 8:07 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 53 min |
| Jun 24, 8:44 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Page, Pottawattamie | 51 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.