Alert archive / Oklahoma / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 210

April 27, 200025 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Apr 27, 2000, 2:00 AM CDT for 25 counties in Oklahoma. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Apr 27, 2000, 2:00 AM CDT (07:00 UTC)
Expired: Apr 27, 2000, 6:00 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 25 counties

Cleveland County, OK, Creek County, OK, Garvin County, OK, Hughes County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 63 km from the middle of the area, began a volume at 07:01 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.

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 27, 2:16 AM CDT	Severe Thunderstorm Warning	OUN	Payne	44 min
Apr 27, 2:25 AM CDT	Severe Thunderstorm Warning	TSA	Creek	50 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.0 hours before the alert went out and 133 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: 2074 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

184 
WWUS9 KMKC 270635
SEL0  

SEL0  
MKC WW 270635
OKZ000-271100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 210
STORM PREDICTION CENTER NORMAN OK
135 AM CDT THU APR 27 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   CENTRAL AND EASTERN OKLAHOMA                           

EFFECTIVE THIS THURSDAY MORNING FROM 200 AM UNTIL 600 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF TULSA OKLAHOMA
TO 35 MILES WEST SOUTHWEST OF MCALESTER OKLAHOMA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 209...

DISCUSSION...BAND OF STRONG/SEVERE THUNDERSTORMS ACROSS EXTREME
NORTHERN OKLAHOMA IS EXPECTED TO SPREAD SSEWD WITHIN BAND OF 50-55
KT NWLY FLOW AT 500 MB.  SSWLY LOW LEVEL JET OF 40-50 KT IS
PROVIDING STRONG WARM ADVECTION LIFT INTO CENTRAL OKLAHOMA...AND AS
THE JET VEERS TO A MORE WESTERLY DIRECTION NEXT 3-4 HOURS IT WILL
SUPPORT CONTINUATION OF SEVERE THREAT INTO EASTERN OKLAHOMA.  
GIVEN ELEVATED NATURE OF THE CONVECTION...LARGE HAIL IS EXPECTED TO
BE THE PRIMARY THREAT.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.  MEAN STORM
MOTION VECTOR 31035.


...WEISS

363,0951 344,0950 344,0973 363,0974

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 27, 12:15 AM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 16 more	6 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2000 Every severe thunderstorm watch 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.