Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 177, NWS Norman, OK

April 27, 2000Noble County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 27, 2000, 1:29 AM CDT for Noble County, Oklahoma. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 27, 2000, 1:29 AM CDT (06:29 UTC)
Expired: Apr 27, 2000, 2:00 AM CDT
In force: 31 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Noble County, OK

The radar

The Vance AFB radar (KVNX), 83 km from the middle of the area, began a volume at 06:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 27, 2:05 AM CDT	Thunderstorm Wind	Red Rock, OK	Several trees were blown over.

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.

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 6.5 hours before the alert went out and 25 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1815 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 270630
SVROKC
OKC103-270700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
129 AM CDT THU APR 27 2000

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NOBLE COUNTY IN NORTHERN OKLAHOMA

* UNTIL 200 AM CDT

* AT 129 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS FROM 
SOUTH OF LAMONT EASTWARD TO NEAR MARLAND...MOVING SOUTHEAST AT 45 
MPH.

* LOCATIONS IN THE WARNING INCLUDE MARLAND AND RED ROCK

HAIL UP TO THE SIZE OF HALF DOLLARS AND WIND GUSTS TO AT LEAST 60 
MPH ARE LIKELY.

LAT...LON 3659 9745 3637 9746 3629 9694 3660 9694

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.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 26, 9:30 PM CDT, 3 hours 59 minutes earlier.

Area forecast discussion, Apr 26, 9:30 PM CDT, 3 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
930 PM CDT WED APR 26 2000

ALREADY SENT ONE UPDATE TO TWEEK WINDS TO A MORE SERLY DIRECTION
ACROSS MOST FO THE SRN ZONES..AND MAY NEED TO DO THE SAME FOR THE
REST OF THE ZONES SHORTLY.  OTW..NOT A WHOLE LOT TO UPDATE AS OF
YET. DESPITE CAPES AOA 2000K AND FAVORABLE SHEAR..STORMS HAVE NOT
BEEN ABLE TO OVERCOME THE CAP AS OF YET.  LATEST OBJECTIVE ANLYS
FIELDS INDICATE LOW LEVEL CONVERGENCE IS RELATIVELY WEAK AND LFC
HEIGHTS ARE NEARING 3000 METERS..WHICH MAY EXPLAIN IN PART THE LACK
OF CONVECTIVE ACTIVITY SO FAR. ALSO RATHER STRONG 700 WAA IN THIS
AREA..WHICH MAY BE ACTING TO STRENGTHEN THE CAP AS WELL.

HOWEVER..WE ARE VERY RELUCTANT TO LOWER POPS ANYWHERE AT THIS TIME
B/C SFC FRONT IS NOW JUST BEGINNING TO IMPINGE UPON THE AREA WHERE
THE BEST ENVIRONMENT IS FOR INTITATION..NAMELY FAR SWRN KS/THE OK/TX
PANHANDLES/EXTRM WRN OK.  WE ARE BASICALLY IN AGREEMENT WITH SPC
SWOMCD #607 IN THINKING THAT THE LLJ AND WAA INTENSIFIES THRU THE
REMAINDER OF THE EVENING THAT STORMS SHUD BE ABLE TO BREACH THE CAP
ALONG THE FRONT.  WILL ALSO NEED TO KEEP AN EYE ON CONVECTION NOW
REGENERATING EAST OF KAMA AS IT MOVES TOWARD THE FAR SWRN ZONES.
 MILLER

.OUN...
OK...NONE.
TX...NONE.

In the hours before

Local storm report, Apr 27, 12:23 AM CDT, 1 hour 6 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1223 AM CDT THU APR 27 2000

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1155 PM    S>E SHATTUCK               OK   .75 INCH HAIL
04/26/00   ELLIS                          RPT BY OHP

CW

Local storm report, Apr 27, 12:40 AM CDT, 49 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1240 AM CDT THU APR 27 2000

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1235 AM    AERNETT                    OK   1.25 INCH HAIL
04/27/00   ELLIS                          SHERIFF DPT

CW

Local storm report, Apr 27, 1:09 AM CDT, 20 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
109 AM CDT THU APR 27 2000

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1255 AM    NEWKIRK                   OK   1.00 INCH HAIL
04/27/00   KAY                            E.M. RPT

CW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 11:34 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	41 min
Apr 27, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Ellis	45 min
Apr 27, 12:54 AM CDT	Severe Thunderstorm Warning	OUN	Grant	51 min
Apr 27, 1:02 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis	43 min
Apr 27, 1:02 AM CDT	Severe Thunderstorm Warning	OUN	Kay	28 min
Apr 27, 1:47 AM CDT	Severe Thunderstorm Warning	OUN	Custer	43 min
Apr 27, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Noble	47 min
Apr 27, 2:14 AM CDT	Flash Flood Warning	OUN	Ellis	3 hr
Apr 27, 2:16 AM CDT	Severe Thunderstorm Warning	OUN	Payne	44 min
Apr 27, 3:47 AM CDT	Severe Thunderstorm Warning	OUN	Ellis	28 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2000 Every severe thunderstorm warning in 2000

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; radar from the NEXRAD Level II archive.