Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 33, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 26, 1987, 7:34 PM CDT for Davis County, Iowa. It was in force for 36 min.
The area
The counties it named.
The facts
- Issued
- May 26, 1987, 7:34 PM CDT (00:34 UTC)
- Expired
- May 26, 1987, 8:10 PM CDT
- In force
- 36 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Davis 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
Peoria Regional, IL (KPIA), launched 00:00Z, 0.6 hours before the alert went out and 237 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
- 1550 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 1677 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 51 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 270037 SVRDSM IAC051-270130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 734 PM CDT TUE MAY 26 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST IOWA... DAVIS AT 728 PM NATIONAL WEATHER SERVICE RADAR IN DES MOINES INDICATED AN INTENSE AND GROWING THUNDERSTORM MOVING NORTHEAST AT 35 MILES AN HOUR IN SCHUYLER COUNTY MISSOURI. THIS WARNING INCLUDES THE TOWNS OF WEST GROVE...PARIS...BELKNAP ...DRAKESVILLE...PULASKI AND TROY...AND THE CITY OF BLOOMFIELD ...LOCATED ABOUT 20 MILES SOUTH OF OTTUMWA. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 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. THESE STORMS CAN AND OCCASIONALLY DOh PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. MCQUIRTER/MARTIN
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 26, 1:50 PM CDT, 5 hours 44 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 145 PM CDT TUE MAY 26 1987 ...A TORNADO WATCH IS IN EFFECT FOR EXTREME NORTHWEST AND WEST CENTRAL IOWA UNTIL 7 PM THIS EVENING... ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE WESTERN THIRD OF IOWA TODAY AND TONIGHT... ....NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED IN IOWA BETWEEEN 100 AND 145 PM... AT 135 PM...STRONG THUNDERSTORMS...PRODUCING VERY HEAVY RAINS WERE LOCATED OVER SOUTH CENTRAL...AND PARTS OF SOUTHEAST IOWA. THE STRONGEST STORMS WERE BETWEEN CENTERVILLE AND OTTUMWA. BOATERS AND CAMPERS IN THE RATHBUN LAKE...AND STEPHENS FOREST SHOULD SEEK SAFE HARBOR OR SHELTER IMMEDIATELY. ANOTHER STRONG THUNDERSTORM WAS LOCATED ABOUT 15 MILES NORTH OF COUNCIL BLUFFS. THESE STORMS ARE CAPABLE PRODUCING VERY HEAVY RAINS AND POSSIBLE HAIL WITH THEIR PASSAGE. WIDELY SCATTERED THUNDERSHOWERS CONTINUED OVER PORTIONS OF CENTRAL AND NORTHEAST IOWA. THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR WITH AN INCREASE IN COVERAGE AND INTENSITY. BARLOW/MCQUIRTER
Special weather statement, May 26, 2:44 PM CDT, 4 hours 50 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 245 PM CDT TUE MAY 26 1987 ...A TORNADO WATCH IS IN EFFECT FOR EXTREME NORTHWEST AND WEST CENTRAL IOWA UNTIL 7 PM THIS EVENING... ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE WESTERN THIRD OF IOWA FOR THIS AFTERNOON AND TONIGHT... ....NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED IN IOWA BETWEEEN 145 AND 245 PM... AT 235 PM...STRONG THUNDERSTORMS...PRODUCING VERY HEAVY RAINS AND POSSIBLY SOME HAIL WERE LOCATED OVER SOUTHEAST IOWA. THE STRONGEST STORM WAS LOCATED JUST EAST OF SIGOURNEY...WHICH IS 25 MILES NORTHEAST OF OTTUMWA. WIDELY SCATTERED THUNDERSTORMS CONTINUED OVER PORTIONS OF SOUTH CENTRAL ...WEST CENTRAL...AND NORTHWEST IOWA. / THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR. BARLOW/MCQUIRTER
Special weather statement, May 26, 3:51 PM CDT, 3 hours 43 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 400 PM CDT TUE MAY 26 1987 THE TORNADO WATCH HAS BEEN CANCELLED FOR PARTS OF EXTREME NORTHWEST IOWA... HOWEVER PARTS OF WEST CENTRAL IOWA REMAIN IN THE WATCH UNTIL 7 PM CDT. COUNTIES CLEARED AND NO LONGER IN THE WATCH ARE... ...NORTHWEST... CHEROKEE O BRIEN PLYMOUTH SIOUX ...WEST CENTRAL... IDA MONONA WOODBURY U IOWA COUNTIES THAT REMAIN IN THE WATCH INCLUDE POTTAWATIAMIE MILLS AND HARRISON. AND SOME ADJACEANT AREAS OF NEBRASKA. FORSTER
Special weather statement, May 26, 3:53 PM CDT, 3 hours 41 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 340 PM CDT TUE MAY 26 1987 ...A TORNADO WATCH IS IN EFFECT FOR THE OMAHA/COUNCIL BLUFFS AREA UNTIL 7 PM THIS EVENING... ...A FLASH FLOOD WATCH IS IN EFFECT FOR THE WESTERN THIRD OF IOWA FOR THIS AFTERNOON AND TONIGHT... ....NO SEVERE WEATHER HAS BEEN OBSERVED OR REPORTED IN IOWA BETWEEEN 245 AND 340 PM... AT 330 PM...A SEVERE THUNDERSTORM WAS LOCATED OVER EAST CENTRAL IOWA IN SOUTHERN MUSCATINE COUNTY 30 MILES SOUTHWEST OF THE QUAD CITIES. 1/2 INCH HAIL ALONG WITH WIND GUSTS OF 50 MILES AN HOUR HAVE BEEN REPORTED WITH THIS STORM. OTHER STRONG STORMS WERE LOCATED OVER SOUTH CENTRAL IOWA...NEAR LAKE RATHBUN 55 MILES SOUTHEAST OF DES MOINES. OTHER STRONG THUNDERSTORMS WERE LOCATED ALONG THE IOWA/NEBRASKA BORDER JUST SOUTH OF THE OMAHA/COUNCIL BLUFFS AREA. VERY HEAVY RAIN ALONG WITH DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE ST[ORMS. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR. BARLOW/MCQUIRTER
Special weather statement, May 26, 6:33 PM CDT, 1 hour 1 minute before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 630 PM CDT TUE MAY 26 1987 ....STRONG THUNDERSTORMS IN POLK COUNTY... AT 625 PM...RADAR SHOWED STRONG THUNDERSTORMS MOVING NORTHEAS T INTO THE EASTERN PART OF POLK COUNTY. THESE STORMS WILL BE IN POLK COUNTY AT LEAST UNTIL 700 PM CDT AND WILL PRODUCE SOME GUSTY WINDS... BRIEF HEAVY RAIN...AND POSSIBLY SOME SMALL HAIL. HAHN
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 5:38 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor | 37 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.