Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 129, NWS Norman, OK

May 27, 1987Cleveland County, Oklahoma County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 27, 1987, 6:56 PM CDT for Cleveland County, Oklahoma County, Oklahoma. It was in force for 34 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: May 27, 1987, 6:56 PM CDT (23:56 UTC)
Expired: May 27, 1987, 7:30 PM CDT
In force: 34 min
Issued by: NWS Norman, OK
Area: Whole counties

Counties Cleveland County, OK, Oklahoma County, OK

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
May 27, 7:15 PM CDT	Thunderstorm Wind 0	Cleveland, OK

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

Ok Cty/Will Rgrs, OK (KOKC), launched 12:00Z, 11.9 hours before the alert went out and 21 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 388 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 27, 4:45 PM CDT, 2 hours 11 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
440 PM CDT WED MAY 27 1987

...A FLASH FLOOD WATCH IS IN EFFECT FOR THE NORTHWEST ONE-THIRD OF
                    OKLAHOMA FOR TODAY...

AT 434 PM... A LARGE AREA OF RAIN AND SCATTERED THUNDERSTORMS...SOME
WITH HEAVY RAINFALL COVERED NORTH CENTRAL...CENTRAL AND SOUTH CENTRAL
OKLAHOMA.  THE STRONG THUNDERSTORMS WERE NORTHEAST OF OKLAHOMA CITY
AND TO THE SOUTHWEST.  OTHER PATCHES OF RAIN HAD DEVLOPED TO THE
EAST BETWEEN TULSA AND MCALESTER.

SLIGHTLY OVER 3 INCHES OF RAIN HAS OCCURRED IN THE OKLAHOMA CITY AREA
DURING THE PAST 4 HOURS.

THE AREA OF THUNDERSTORMS WAS DRIFTING TO THE EAST AT 5 MILES AN HOUR
WHILE THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT 25 MILES
AN HOUR.

Special weather statement, May 27, 5:45 PM CDT, 1 hour 11 minutes before

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Special weather statement, May 27, 5:56 PM CDT, 1 hour before

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Local storm report, May 27, 6:32 PM CDT, 24 minutes before

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Special weather statement, May 27, 6:48 PM CDT, 8 minutes before

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Special weather statement, May 27, 6:50 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
645 PM CDT WED MAY 27 1987

...A FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF NORTHWESTERN...CENTRAL
AND NORTHERN OKLAHOMA FOR TONIGHT AND THURSDAY...

AT 635 PM...THE OKLAHOMA CITY RADAR INDICATED A LARGE AREA OF RAIN AND
THUNERSTORMS EAST OF A LINE FROM ELMER IN JACKSON COUNTY TO BUTLER IN
CUSTER COUNTY TO MANCHESTER IN GRANT COUNTY.  HEAVY RAIN COVERED A LARGE
AREA FROM OKLAHOMA CITY TO THE FORT SILL AREA.  OTHER THUNDERSTORMS WITH
HEAVY RAIN WERE LOCATED SOUTH OF TULSA.   IF FLASH FLOODING IS OBSERVED
...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO NOT STAYT IN AREAS
SFUBJECT TO FLOODING WHEN WATER BEGINS RISING.

THE AREA OF THUNDERSTORMS WAS DRIFTING TO THE EAST AT 10 MILES AN HOUR
WHILE THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES
AN HOUR.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	65 min
May 26, 9:34 PM CDT	Flash Flood Warning	OUN	Alfalfa, Blaine, Dewey, Garfield, Major	3 hr
May 26, 9:34 PM CDT	Flash Flood Warning	OUN	Custer	3 hr
May 26, 9:34 PM CDT	Flash Flood Warning	OUN	Grant	3 hr
May 26, 9:37 PM CDT	Severe Thunderstorm Warning	OUN	Kay	43 min
May 26, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Major	46 min
May 26, 10:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	47 min
May 27, 12:28 AM CDT	Flash Flood Warning	OUN	Blaine, Custer, Dewey	2 hr
May 27, 10:45 AM CDT	Flash Flood Warning	OUN	Garfield, Kingfisher	3 hr
May 27, 3:00 PM CDT	Flash Flood Warning	OUN	Canadian, Logan, Oklahoma	3 hr
May 27, 5:33 PM CDT	Flash Flood Warning	OUN	Caddo	4 hr
May 27, 5:33 PM CDT	Flash Flood Warning	OUN	Canadian, Cleveland, Logan, Oklahoma	4 hr
May 27, 5:33 PM CDT	Flash Flood Warning	OUN	Grady, McClain	4 hr
May 27, 6:08 PM CDT	Flash Flood Warning	OUN	Comanche, Kiowa	3 hr
May 27, 6:08 PM CDT	Flash Flood Warning	OUN	Stephens	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1987 Every 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.