Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 59, NWS Norman, OK

May 1, 1997Greer County, Harmon County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 1, 1997, 5:13 PM CDT for Greer County, Harmon County, Oklahoma. It was in force for 62 min. 8 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 1, 1997, 5:13 PM CDT (22:13 UTC)
Expired: May 1, 1997, 6:15 PM CDT
In force: 62 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Greer County, OK, Harmon County, OK

What was reported inside it

Time	Report	Where	Remark
May 1, 5:28 PM CDT	Hail 1.75	Madge, OK
May 1, 5:30 PM CDT	Hail 0.88	Mangum, OK
May 1, 5:30 PM CDT	Hail 2	Madge, OK
May 1, 5:37 PM CDT	Hail 1	Vinson, OK	Quarter-sized hail stripped foliage from vegetation.
May 1, 5:40 PM CDT	Hail 1.75	Madge, OK
May 1, 5:41 PM CDT	Hail 2.25	Vinson, OK
May 1, 5:45 PM CDT	Hail 1	Willow, OK
May 1, 6:25 PM CDT	Hail 0.88	Granite, OK

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 watch it was issued in

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

Issued	Product	Office	Lasted
May 1, 4:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 10.2 hours before the alert went out and 121 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: 1634 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 1, 4:02 PM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, May 1, 4:02 PM CDT, 1 hour 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
355 PM CDT THU MAY 1 1997

ACTIVE WX SCENARIO APPEARS TO BE ON THE WAY. SFC DRYLINE EXTENDS ACRS
WRN TX AND OK PNHDLS ATTM WITH CU FIELD AND A FEW ECHOES DVLPG IN MST
AXIS TO THE IMMEDIATE EAST OF THE DRYLINE. WIND PROFILES STILL LOOK
FAVORABLE FOR A FEW ROTATING STORMS WITH ADAP AND ETA HELICITIES IN
EXCESS OF 300 M2/S2. AS SFC LOW OVER SERN CO CONTINUES TO
DEEPEN...WINDS OVER XTRM NWRN ZNS ARE WELL INTO WIND ADVSRY CRITERIA
AND WILL LIKELY STAY THERE FOR A WHILE. CAUTION ON AREA LAKES WILL
SUFFICE FOR THE REST OF THE FCST AREA.

HAVE GONE WITH ETA/AVN FOR SFC LOW MOVMT AS NGM SHOWS USUAL NRN
BIAS.
HAVE PUT HIEST POPS NEAR THE PROGGED SFC LOW POSITION WHICH WILL BE
NEAR PNC BY 12Z FRI. FNT XTNDG FM SFC LOW WILL MOVE ACRS CNTL ZNS
ARND 12Z AND THRU THE REST OF THE AREA BY AROUND 21Z FRI. WILL HOLD
ON TO SLGT CHC TO CHC POPS FOR FRI WITH RESIDUAL LL MSTR HANGING
AROUND AND UPR TROF STILL WEST OF AREA.

WX WILL CALM DOWN BY SAT NGT AND INTO SUN WITH TEMPS NEAR NORMAL
VALUES. WINDS WILL CRANK BACK UP BY MON AND INTO TUES AS UPR RIDGE
FLATTENS AND LEE TROF DVLPS.

FCSTID = 17/MMT
OKC   56  72  46  73 /  60  30  10   0
HBR   54  74  43  76 /  60  20   0   0
SPS   58  75  47  76 /  60  20   0   0
GAG   50  72  39  74 /  60  20   0   0
PNC   55  71  45  72 /  80  30  10   0
DUA   59  70  47  72 /  50  40  10  10

.OKC...
OK...WIND ADVISzORY ZNS 004-005-009-010-014>016.
     CAUTION ON AREA LAKES ZNS 006>008-011>013-017>053.
TX...CAUTION ON AREA LAKES ZNS 083>090.

In the hours before

Special weather statement, May 1, 12:30 PM CDT, 4 hours 43 minutes before

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Special weather statement, May 1, 2:50 PM CDT, 2 hours 23 minutes before

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Special weather statement, May 1, 2:51 PM CDT, 2 hours 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	60 min
May 1, 6:12 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa	48 min
May 1, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	64 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1997 Every severe thunderstorm warning in 1997

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.