Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 320, NWS Norman, OK

June 27, 1997Blaine County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 27, 1997, 4:48 PM CDT for Blaine County, Oklahoma. It was in force for 42 min. 1 report 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: Jun 27, 1997, 4:48 PM CDT (21:48 UTC)
Expired: Jun 27, 1997, 5:30 PM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Blaine County, OK

The radar

The Vance AFB radar (KVNX), 100 km from the middle of the area, began a volume at 21:39 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
Jun 27, 5:05 PM CDT	Thunderstorm Wind	Canton, OK	Severe thunderstorm winds downed power poles.

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

Norman, OK (KOUN), launched 12:00Z, 9.8 hours before the alert went out and 118 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: 1635 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 54 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 Jun 27, 3:30 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Jun 27, 3:30 PM CDT, 1 hour 18 minutes before

FPUS3 KOKC 272029
AFDOKC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
330 PM CDT FRI JUN 27 1997

WITH MOIST AND UNCAPPED ATMOSPHERE...POPCORN CONVECTION THIS
AFTERNOON SIMILAR TO YESTERDAY IN CENTRAL AND SOUTHEASTERN ZONES.
SHORTWAVE MOVING OUT OF THE TX PANHANDLE PROVIDING SOME UPPER SUPPORT
IN SOUTHWESTERN ZONES SO EXPECT CONVECTION TO LAST PAST SUNSET THIS
EVENING IN SOUTHWEST AND TO LINGER INTO THE NIGHT OVER SOUTH-CENTRAL
AND SOUTHEASTERN ZONES AS S/W MOVES EAST TONIGHT. LOOKS A BIT MORE
STABLE FOR SATURDAY AS DRIER AIR WORKS ITS WAY INTO FA BUT COULD
STILL SEE SOME AFTERNOON CONVECTION SC AND SERN ZONES. DRY WITH A
WARMING TREND FOR SUNDAY OR MONDAY AS UPPER RIDGE BUILDS OVER AREA.
WILL LEAVE SLIGHT CHANCE FOR TUESDAY ...DESPITE UPPER RIDGE... AS
SURFACE FRONT PROGGED TO MOVE INTO NRN PTNS FA.

FCSTID = 10
OKC   71  94  72  96 /  10  10  10  20
HBR   70  94  71  97 /  30  10  10  10
SPS   70  94  71  97 /  30  10  10  10
GAG   68  93  69  97 /  10  10  10  20
PNC   71  94  72  96 /  10  10  10  20
DUA   72  92  72  95 /  30  20  20  10

.OKC...
OK...NONE.
TX...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Logan	48 min
Jun 27, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	48 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; radar from the NEXRAD Level II archive.