Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 457, NWS Norman, OK

October 28, 2000Caddo County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 28, 2000, 8:13 PM CDT for Caddo County, Oklahoma. It was in force for 32 min. No storm report in the archive falls 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.

The facts

Issued: Oct 28, 2000, 8:13 PM CDT (01:13 UTC)
Expired: Oct 28, 2000, 8:45 PM CDT
In force: 32 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Caddo County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 01:13 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 28, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 83 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: 282 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

823 
WUUS54 KOUN 290113
SVROKC
OKC015-290145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
813 PM CDT SAT OCT 28 2000

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CADDO COUNTY IN SOUTHWEST OKLAHOMA

* UNTIL 845 PM CDT

* AT 813 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4
  MILES SOUTHWEST OF GRACEMONT...MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE ALBERT...ANADARKO...BINGER...
  COGAR...GRACEMONT AND LOOKEBA

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING PARTICULARLY DAMAGING
WINDS. MOBILE HOMES AND HIGH PROFILE VEHICLES ARE ESPECIALLY
SUSCEPTIBLE TO HIGH WINDS AND MAY BE OVERTURNED.

LAT...LON 3519 9846 3493 9818 3537 9810 3537 9838

ANDRA

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 Oct 28, 3:45 PM CDT, 4 hours 28 minutes earlier.

Area forecast discussion, Oct 28, 3:45 PM CDT, 4 hours 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
345 PM CDT SAT OCT 28 2000

ACTIVE EVENING EXPECTED ACROSS ENTIRE AREA AS VIGOROUS UPPER TROF
MAINTAINS AN ACTIVE SQUALL LINE ALONG PACIFIC COLD FRONT AS IT
SWEEPS INTO W ZONES BY AROUND 00Z AND INTO CENTRAL OK AROUND 06Z.
POPS TONIGHT AOA 90PCT AREAWIDE. RAPID MOVEMENT OF STORMS SHOULD
PREVENT EXCESSIVE RAIN FROM BECOMING A PROBLEM AGAIN, BUT POTENT
UPPER DYNAMICS, DRY PUNCH ALOFT, AND FAVORABLE SHEAR PROFILES ARE
ALL MORE THAN ADEQUATE FOR SEVERE. DRY SLOT AND SUBSIDENCE BEHIND
THE SHORTWAVE EXPECTED TO RESULT IN CLEARING FROM SW TO NE BEHIND
THE LINE TONIGHT AND SUN. WILL KEEP LOW POPS IN E ZONES ON SUN FOR
POSSIBLE LINGERING MORNING SHOWERS.

SURFACE BOUNDARY WILL LOSE DEFINITION IN WIND AND PRESSURE FIELDS AS
IT STALLS ACROSS SE OK INTO S TX SUN NIGHT, BUT SHOULD MAINTAIN
ITSELF AS A ZONE OF ENHANCED MOISTURE GRADIENT. SHORTWAVE RIDGING
BEHIND THE UPPER TROF EXPECTED TO LIMIT PRECIP POTENTIAL UNTIL THE
LOW LEVEL MOISTURE NEAR THE COAST BEGINS RETURNING N. THAT SHOULD
START TO HAPPEN LATE MON AND ESPECIALLY MON NIGHT AS THE NEXT/ NEXT/
NEXT STRONG UPPER LOW DIGS INTO THE SW AND MOVES INTO AZ. INCREASING
LOW LEVEL WARM ADVECTION AND MOISTURE TRANSPORT EXPECTED TO RESULT
IN NOCTURNAL CONVECTION BREAKING OUT ACROSS AREA MON NIGHT AS WARM
FRONT LIFTS N INTO OK, AS SUGGESTED BY AVN.

FOR TUE AFTERNOON THRU WED, SEE PARAGRAPH 1 ABOVE BUT CHANGE THIS
EVENING TO TUE EVENING, AND CHANGE SUN TO WED. SCENARIO LOOKS
REMARKABLY SIMILAR, SO ANOTHER ACTIVE WEATHER EVENT IS LIKELY TUE
INTO TUE NIGHT.

FCSTID = 24
OKC   58  73  54  74 / 100  20   0  10
HBR   55  74  51  75 / 100   0   0  10
SPS   58  76  54  78 / 100   0   0  10
GAG   53  71  46  73 / 100  10   0  10
PNC   60  73  53  75 / 100  30   0  10
DUA   62  72  59  74 /  90  30   0  10

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

v

In the hours before

Local storm report, Oct 28, 6:58 PM CDT, 1 hour 15 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
658 PM CDT SAT OCT 28 2000

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

0535 PM    20 SW ERICK               OK   WIND DAMAGE
10/28/00   BECKHAM                        LARGE TREE LIMBS BLOWN
                                          DOWN. RPTD BY PUBLIC.

0545 PM    8 N RED SPRINGS           TX   60 MPH WIND GUST
10/28/00   BAYLOR                         REPORTED BY PUBLIC

0555 PM    11 SW GRAYBACK            TX   60 MPH WIND GUST
10/28/00 <  WILBARGER                      REPORTED BY PUBLIC

TL

Local storm report, Oct 28, 7:02 PM CDT, 1 hour 11 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
702 PM CDT SAT OCT 28 2000

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

0648 PM    3 jSE HOBART               OK   62 MPH WIND GUST
10/28/00   KIOWA                          ASOS MEASURED

FM

Special weather statement, Oct 28, 7:20 PM CDT, 53 minutes before

OKZ014-021-033-034-036-TXZ083>085-087-088-290045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
720 PM CDT SAT OCT 28 2000

...TORNADO WATCH 766 HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES
   IN OKLAHOMA...

ROGER MILLS...BECKHAM...GREER...HARMON...AND JACKSON.

...TORNADO WATCH 765 HAS BEEN CANCELLED FOR THE FOLLOWING
COUNTIES IN NORTH TEXAS...

HARDEMAN...FOARD...KNOX...WILBARGER... AND BAYLOR.

STRONG TO SEVERE THUNDERSTORMS HAVE MOVED NORTHEAST OF THESE
COUNTIES AND ADDITIONAL SEVERE THUNDERSTORM DEVELOPMENT IS
NOT EXPECTED.

02

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 28, 7:03 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	42 min
Oct 28, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.