Alert archive / Oklahoma / Tornado Warnings in 1990

Tornado Warning 21, NWS Norman, OK

April 24, 1990Ellis County, Harper County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 24, 1990, 11:27 PM CDT for Ellis County, Harper County, Oklahoma. It was in force for 33 min.

The area

The counties it named.

The facts

Issued: Apr 24, 1990, 11:27 PM CDT (04:27 UTC)
Expired: Apr 25, 1990, 12:00 AM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Whole counties

Counties Ellis County, OK, Harper County, OK

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

Dodge City, (KDDC), launched 00:00Z, 4.5 hours before the alert went out and 142 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: 1446 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1164 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 12.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KOKC 250426
TOROKC
OKC045-059-250500-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1127 PM CDT TUE APR 24 1990
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL MIDNIGHT CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN NORTHWEST OKLAHOMA
 
   ...NORTHERN ELLIS COUNTY...SOUTHERN HARPER COUNTY
 
AT 1127 PM A TORNADO WAS REPORTED ON THE GROUND 8 MILES
SOUTH-SOUTHWEST OF MAY MOVING NORTH-NORTHEAST AT 15 MPH. PERSONS IN
THE TOWN OF MAY SHOULD TAKE SHELTER IMMEDIATELY.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	59 min
Apr 24, 9:58 PM CDT	Tornado Warning	OUN	Ellis	32 min
Apr 24, 10:29 PM CDT	Tornado Warning	OUN	Ellis	31 min
Apr 24, 10:58 PM CDT	Tornado Warning	OUN	Ellis	32 min
Apr 24, 11:33 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	42 min
Apr 24, 11:58 PM CDT	Tornado Warning	OUN	Harper	32 min
Apr 25, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Ellis	51 min
Apr 25, 12:14 AM CDT	Severe Thunderstorm Warning	OUN	Woodward	46 min
Apr 25, 12:21 AM CDT	Tornado Warning	OUN	Ellis	24 min
Apr 25, 12:27 AM CDT	Severe Thunderstorm Warning	OUN	Woods	63 min
Apr 25, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Harper	36 min
Apr 25, 1:36 AM CDT	Severe Thunderstorm Warning	OUN	Ellis	54 min
Apr 25, 12:33 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	42 min
Apr 25, 12:47 PM CDT	Severe Thunderstorm Warning	OUN	Carter	43 min
Apr 25, 6:28 PM CDT	Flash Flood Warning	OUN	Bryan	3 hr
Apr 25, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	46 min
Apr 25, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Marshall	39 min

Nearby

Tornado Warnings in Oklahoma, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.