Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 113, NWS Norman, OK

April 19, 2003Alfalfa County, Garfield County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 19, 2003, 2:51 AM CDT for Alfalfa County, Garfield County, Grant County, Oklahoma. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 19, 2003, 2:51 AM CDT (07:51 UTC)
Expired: Apr 19, 2003, 3:30 AM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Alfalfa County, OK, Garfield County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 14 km from the middle of the area, began a volume at 07:54 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 19, 1:25 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.9 hours before the alert went out and 168 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: 1488 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 190751
SVROKC
OKC003-047-053-190830-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
250 AM CDT SAT APR 19 2003

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GARFIELD COUNTY IN NORTHERN OKLAHOMA
  GRANT COUNTY IN NORTHERN OKLAHOMA
  ALFALFA COUNTY IN NORTHWEST OKLAHOMA

* UNTIL 330 AM CDT

* AT 250 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 9
  MILES SOUTH OF HELENA...MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IN THE WARNING INCLUDE GOLTRY...HELENA...HILLSDALE...
  JEFFERSON...JET...MEDFORD...NASH...POND CREEK AND WAKITA

HAIL UP TO THE SIZE OF GOLFBALLS AND WINDS TO 65 MPH ARE LIKELY WITH 
THIS SEVERE THUNDERSTORM.

LAT...LON 3647 9835 3648 9809 3673 9763 3697 9799

$$

MAXWELL

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 18, 10:55 PM CDT, 3 hours 56 minutes earlier.

Area forecast discussion, Apr 18, 10:55 PM CDT, 3 hours 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1055 PM CDT FRI APR 18 2003

HAVE UPPED OVERNIGHT POPS TO CATEGORICAL IN A CORRIDOR THRU CENTRAL
OK. CONVECTION NOW DEVELOPING OVER W AND CENTRAL TX EXPECTED TO
CONTINUE DEVELOPING/INCREASING/SPREADING NE AS LLJ ENHANCES LL
CONVERGENCE AND LIFT BENEATH AND AHEAD OF MID-LEVEL SHORTWAVE TROF
AND POTENT UPPER JET. EXPECT CONVECTION TO EVOLVE INTO 1 OR MORE MCS
CLUSTERS AND ROLL NE ACROSS AREA LATE TONIGHT.

PRELIM ASSESSMENT OF SAT SEVERE POTENTIAL AFTER CONSULTING W/SPC IS
MDT RISK FOR MUCH OF OK E OF RUFLY END-OKC-ADM. POTENTIAL FOR STRONG
TORNADOES EXPECTED TO BE OVER RELATIVELY SMALL AREA...EXACT LOCATION
UNCERTAIN DUE TO QUESTIONS ON OVERNIGHT CONVECTIVE EVOLUTION AND
SUBSEQUENT MESOSCALE FEATURES. PART OF MDT AREA COULD BE UPGRADED IN
A LATER UPDATE.

FCSTID =   24
OKC   62  76  50  68 /  80  70  60   0
HBR   57  77  49  70 /  70  50  20   0
SPS   61  81  52  73 /  60  50  20   0
GAG   52  64  43  66 /  40  70  80   0
PNC   61  69  48  65 /  60  80  80   0
DUA   63  81  55  72 /  50  70  70   0

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

Hazardous weather outlook, Apr 18, 12:00 PM CDT, 14 hours 51 minutes before

OKZ004>048-050>052-TXZ083>090-191200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT FRI APR 18 2003

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS GENERALLY SOUTHEAST OF A LINE FROM
CHEROKEE TO CHEYENNE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM LATE
THIS AFTERNOON THROUGH EARLY SATURDAY MORNING.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS FROM THIS
AFTERNOON UNTIL EARLY SATURDAY MORNING.

DISCUSSION...
A DRYLINE WILL CONTINUE TO SHARPEN AND PUSH EASTWARD ACROSS PORTIONS
OF WESTERN OKLAHOMA AND WESTERN NORTH TEXAS THIS AFTERNOON.
DEWPOINTS AHEAD OF THE DRYLINE WILL CONTINUE TO INCREASE AS MOISTURE
MOVES NORTHWARD FROM CENTRAL TEXAS. THE ATMOSPHERE WILL BECOME
MODERATELY UNSTABLE THIS AFTERNOON AS TEMPERATURES WARM INTO THE
80S.  CONVERGENCE ALONG THE DRYLINE AND A STRONG UPPER LEVEL JET
WILL COMBINE TO PRODUCE THUNDERSTORMS BY LATE THIS AFTERNOON.  SHEAR
PROFILES ARE EXPECTED TO BE STRONG ENOUGH FOR SUPERCELLS TO DEVELOP
WITH LARGE HAIL AND DAMAGING WIND GUSTS THE MAIN WEATHER THREAT.

ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP OVERNIGHT...AS LOW
LEVEL WINDS INCREASE.  SOME OF THESE STORMS MAY PRODUCE LARGE
HAIL.   HEAVY RAINFALL MAY ALSO OCCUR WITH THESE THUNDERSTORMS
TONIGHT...ESPECIALLY FROM WESTERN NORTH TEXAS INTO CENTRAL
OKLAHOMA.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SATURDAY APR 19.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...90 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60 PERCENT.

OTHER HAZARDOUS WEATHER...
THERE WILL BE AN EXTREME TO HIGH FIRE DANGER THIS AFTERNOON
ACROSS ALL OF OKLAHOMA AND WESTERN NORTH TEXAS.  PLEASE REFER
TO FIRE WEATHER PRODUCTS FOR DETAILED INFORMATION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE WEATHER ON SATURDAY ACROSS
MOST OF CENTRAL AND EASTERN OKLAHOMA.  WESTERN OKLAHOMA AND
WESTERN NORTH TEXAS WILL HAVE A SLIGHT RISK OF SEVERE THUNDERSTORMS.

THUNDERSTORMS ARE EXPECTED TO MOVE NORTHEAST OUT OF OKLAHOMA BY
EARLY SATURDAY AFTERNOON.  THIS WILL ALLOW FOR STRONG HEATING AS
SKIES CLEAR.  LOW PRESSURE IS EXPECTED TO DEVELOP OVER SOUTHWEST
OKLAHOMA...AS A STRONG UPPER LEVEL SYSTEM APPROACHES THE SOUTHERN
PLAINS.  AN ASSOCIATED DRYLINE AND FRONTAL BOUNDARY WILL BE THE
FOCUS FOR THUNDERSTORM DEVELOPMENT BY MID TO LATE AFTERNOON.
MODERATE TO HIGH INSTABILITY AND FAVORABLE SHEAR PROFILES WILL
SUPPORT SUPERCELL THUNDERSTORMS WITH TORNADOES POSSIBLE.  HEAVY
RAINFALL WILL ALSO BE POSSIBLE...ESPECIALLY ACROSS THE NORTHERN HALF
OF OKLAHOMA.

OTHER HAZARDOUS WEATHER...
NO OTHER HAZARDOUS WEATHER IS EXPECTED.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
SATURDAY.

MAXWELL/SPEG

In the hours before

Local storm report, Apr 19, 1:58 AM CDT, 53 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
158 AM CDT SAT APR 19 2003

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

0155 AM    8 SW CHILLICOTHE          TX   60 MPH WIND GUST
04/19/03   HARDEMAN                       HAM RADIO SPOTTER

0154 AM    5 W CHILLICOTHE           TX   1.75 INCH HAIL
04/19/03   HARDEMAN                       REPORTED BY HAM RADIO
                                          SPOTTER

0146 AM    QUANNAH                   TX   1.00 INCH HAIL
04/19/03   HARDEMAN                       REPORTED BY HAM RADIO
                                          SPOTTER

0120 AM    10 NE WILLOW              OK   71 MPH WIND GUST
04/19/03   WASHITA                        REPORTED BY OKLAHOMA
                                          MESONET

0125 AM    10 NE WILLOW              OK   62 MPH WIND GUST
04/19/03   WASHITA                        REPORTED BY OKLAHOMA
                                          MESONET

JF

Local storm report, Apr 19, 2:18 AM CDT, 33 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
218 AM CDT SAT APR 19 2003

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

0215 AM    4 S HUMPHREYS             OK   1.00 INCH HAIL
04/19/03   JACKSON                        REPORTED BY HAM SPOTTER

FREDERKING

Local storm report, Apr 19, 2:27 AM CDT, 24 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
227 AM CDT SAT APR 19 2003

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

0227 AM    FREDERICK                 OK   1.75 INCH HAIL
04/19/03   TILLMAN                        REPORTED BY HAM RADIO
                                          SPOTTER

FREDERKING

Local storm report, Apr 19, 2:30 AM CDT, 21 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
230 AM CDT SAT APR 19 2003

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

0150 AM    3 E QUANNAH               TX   2.00 INCH HAIL
04/19/03   HARDEMAN                       REPORTED BY HAM RADIO
                                          SPOTTER

FREDERKING

Special weather statement, Apr 19, 2:34 AM CDT, 17 minutes before

OKZ038-190745-

SIGNIFICANT WEATHER ADVISORY
NATIONAL WEATHER SERVICE NORMAN OK
234 AM CDT SAT APR 19 2003

THIS SIGNIFICANT WEATHER ADVISORY IS FOR COMANCHE COUNTY.

A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WAS LOCATED 14
MILES WEST OF INDIAHOMA AT 234 AM CDT...MOVING EAST NORTHEAST AT 55
MPH. THIS STORM HAS A HISTORY OF PRODUCING DIME TO GOLFBALL SIZE
HAIL.

PEOPLE IN COMANCHE COUNTY...INCLUDING THE CITY OF LAWTON...SHOULD
MONITOR THIS STORM CLOSELY. LISTEN FOR WARNINGS AND WATCH FOR
THREATENING WEATHER CONDITIONS AS THIS STORM APPROACHES.

24

Local storm report, Apr 19, 2:36 AM CDT, 15 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
236 AM CDT SAT APR 19 2003

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

0234 AM    SNYDER                    OK   1.00 INCH HAIL
04/19/03   JACKSON                        REPORTED BY HAM RADIO
                                          SPOTTER

JF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	32 min
Apr 19, 12:23 AM CDT	Severe Thunderstorm Warning	OUN	Harmon	22 min
Apr 19, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	36 min
Apr 19, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	45 min
Apr 19, 1:19 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	41 min
Apr 19, 1:34 AM CDT	Severe Thunderstorm Warning	OUN	Custer	26 min
Apr 19, 1:49 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	41 min
Apr 19, 1:59 AM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	46 min
Apr 19, 2:03 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	42 min
Apr 19, 2:07 AM CDT	Tornado Warning	OUN	Tillman	38 min
Apr 19, 2:25 AM CDT	Severe Thunderstorm Warning	OUN	Major	35 min
Apr 19, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	49 min
Apr 19, 2:47 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	43 min
Apr 19, 3:01 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	44 min
Apr 19, 3:29 AM CDT	Severe Thunderstorm Warning	OUN	Canadian	46 min
Apr 19, 3:43 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	47 min
Apr 19, 3:49 AM CDT	Severe Thunderstorm Warning	OUN	Grady	41 min
Apr 19, 4:03 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	42 min
Apr 19, 4:11 AM CDT	Severe Thunderstorm Warning	OUN	Logan	49 min
Apr 19, 4:13 AM CDT	Severe Thunderstorm Warning	OUN	Logan	47 min
Apr 19, 4:32 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	43 min
Apr 19, 4:45 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	30 min
Apr 19, 4:49 AM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	41 min
Apr 19, 5:01 AM CDT	Severe Thunderstorm Warning	OUN	Garfield	44 min
Apr 19, 5:20 AM CDT	Severe Thunderstorm Warning	OUN	Noble	40 min
Apr 19, 5:39 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	36 min
Apr 19, 5:41 AM CDT	Severe Thunderstorm Warning	OUN	Kay	49 min
Apr 19, 6:13 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	47 min
Apr 19, 7:18 AM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	42 min
Apr 19, 1:51 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	54 min
Apr 19, 2:45 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	45 min
Apr 19, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Grant	36 min
Apr 19, 3:31 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	44 min
Apr 19, 3:37 PM CDT	Tornado Warning	OUN	Ellis, Woodward	23 min
Apr 19, 3:56 PM CDT	Severe Thunderstorm Warning	OUN	Woods	64 min
Apr 19, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Grant	47 min
Apr 19, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Grant	49 min
Apr 19, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	48 min
Apr 19, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Grant	47 min
Apr 19, 5:49 PM CDT	Severe Thunderstorm Warning	OUN	Kay	56 min
Apr 19, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Kay	47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2003 Every severe thunderstorm warning in 2003

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.