Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 343, NWS Norman, OK

May 2, 20084 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 2, 2008, 2:12 AM CDT for 4 counties in Oklahoma. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 2, 2008, 2:12 AM CDT (07:12 UTC)
Expired: May 2, 2008, 3:00 AM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Hughes County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 68 km from the middle of the area, began a volume at 07:14 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
May 2, 1:09 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.2 hours before the alert went out and 73 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: 3804 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1259 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 30.5

Open this sounding in Storm Lab

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, 9:11 PM CDT, 5 hours 1 minute earlier.

Area forecast discussion, May 1, 9:11 PM CDT, 5 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
911 PM CDT THU MAY 1 2008

.DISCUSSION...
TWEAKS TO WIND AND FRONTAL TIMING TONIGHT AND TOMORROW MORNING.
BEST CHANCES FOR STORMS OVERNIGHT WILL BE NORTHERN PARTS OF
OKLAHOMA AS STRONG CONVERGENCE OCCURS ALONG FRONT. NEW LOCAL RUN
OF WRF KEEPS ACTIVITY NEAR/NORTH OF KANSAS BORDER...BUT WITH
MOISTURE AND COOLING ALOFT ACCOMPANYING FRONT...WE WILL KEEP
RELATIVELY HIGH POPS AS FAR SOUTH AS I-40. ALTHOUGH DISCRETE CELLS
POSSIBLE FOR A FEW MORE HOURS...STRONG LINEAR FORCING WILL LIKELY
LEAD TO SQUALL-LINE FORMATION.

&&

.PREV DISCUSSION... /ISSUED 230 PM CDT THU MAY 1 2008/

DISCUSSION...
THE LARGER SCALE PERSPECTIVE FOR TONIGHTS WEATHER HAS NOT CHANGED
MUCH FROM EARLIER. THE MOST WESTWARD OF TWO SMALL MID/UPPER LOWS
OVER THE CENTRAL ROCKIES IS CURRENTLY PIVOTING THROUGH THE BASE OF A
BROADER SCALE TROUGH OVER THE FOUR CORNERS REGION WHICH IS
MAINTAINING AN AXIS OF LARGER PRESSURE FALLS OVER THE OKLAHOMA
PANHANDLE. AN ASSOCIATED COLD FRONTAL BOUNDARY NEAR A LINE FROM
MEDFORD TO SEILING HAS STALLED WHILE THE DRYLINE HAS BECOME SLIGHTLY
MORE DISCERNIBLE FROM PERRY...TO EL RENO...AND WAURIKA. A 20Z
BALLOON FROM KOUN WILL BE RELEASED SHORTLY. IN THE MEANTIME...
SATELLITE AND PROFILER/METARS TRENDS CONTINUE TO INDICATE SHALLOW
MOISTURE AND A MODEST CAP.

ISOLATED CONVECTION REMAINS UNLIKELY BUT POSSIBLE ANYWHERE NEAR THE
DRYLINE THROUGH MID EVENING...BY WHICH TIME THE DRYLINE SHOULD HAVE
RETREATED IN RESPONSE TO THE APPROACHING UPPER LOW. MEANWHILE...THE
STALLED FRONT OVER NORTHERN OKLAHOMA SHOULD RESUME A SOUTHWARD
MOVEMENT TOWARD THE DRYLINE AND INTO A DEEPENING MOIST WARM SECTOR.
OUR GREATEST CONCERN FOR SEVERE THUNDERSTORMS IS THIS EVENING AS THE
DRYLINE RETREATS TOWARD THE REORGANIZING COLD FRONT OVER NORTHWEST
OR NORTH CENTRAL OKLAHOMA...WHICH IS WHEN INSTABILITY WILL
HIGHEST...CONVECTIVE INHIBITION LOWEST...AND VERTICAL WIND PROFILES
MOST SUPPORTIVE OF SUPERCELLS.

AFTER MIDNIGHT...WE STILL ANTICIPATE THAT THE CONVECTIVE MODE WILL
GRADUALLY TRANSITION AWAY FROM SUPERCELLS AND MORE TOWARD
MULTICELLS...INCLUDING A SQUALL-LINE...ESPECIALLY EAST OF INTERSTATE
35.

ASIDE FROM THE ABOVE MENTIONED SEVERE WEATHER CONCERNS...HIGH BASED
SHOWERS ARE FORMING NEAR DEEPER PORTIONS OF A BAROCLINIC ZONE NEAR
THE KANSAS/COLORADO BORDER. A LOCAL RUN OF THE WRF ARW SHOWS THESE
SHOWERS REACHING THE KANSAS/OKLAHOMA BORDER NORTH OF WOODWARD
BETWEEN 22 AND 24Z...WITH A SMALL RISK OF SHORT TERM/HIGH WIND
POTENTIAL. WILL HAVE TO MONITOR CLOSELY.

AFTER TONIGHT...THE GRIDDED FORECAST RESEMBLES THE GFS AND
ASSOCIATED MAV MOS...WHICH SHOW A SIGNIFICANT DRY AND COOLER PERIOD
BEGINNING FRIDAY AND CONTINUING THROUGH THE WEEKEND...BY WHICH TIME
THE GFS...WHICH AGREES WITH THE LARGER SCALE MESSAGE OF THE GFS
ENSEMBLE MEAN AND ECMWF...DEVELOPS A SPLIT-FLOW PATTERN AND CONTINUES
IT THROUGH MIDWEEK...SUGGESTING A DIFFICULT FORECASTING PERIOD
BEGINNING NEXT WEEK...WITH CHANCES OF CONVECTION RETURNING TO THE
REGION WITH THE DETAILS HIGHLY UNCERTAIN.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  54  71  43  65 /  30  10  10  10
HOBART OK         51  75  41  68 /  10   0  10  10
WICHITA FALLS TX  57  80  45  71 /  10  10  10  10
GAGE OK           43  66  36  65 /  10   0  10  10
PONCA CITY OK     54  68  41  67 /  70  10  10   0
DURANT OK         65  76  53  69 /  20  20  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL 11 PM CDT THIS EVENING FOR
     OKZ004-005-009- 010-014>016-021-022.

TX...NONE.

&&

22/11

Hazardous weather outlook, May 2, 2:00 AM CDT, 12 minutes before

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In the hours before

Local storm report, May 2, 1:00 AM CDT, 1 hour 12 minutes before

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Local storm report, May 2, 1:07 AM CDT, 1 hour 5 minutes before

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Special weather statement, May 2, 1:09 AM CDT, 1 hour 3 minutes before

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Special weather statement, May 2, 1:40 AM CDT, 32 minutes before

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Special weather statement, May 2, 1:42 AM CDT, 30 minutes before

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Local storm report, May 2, 1:48 AM CDT, 24 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, 7:02 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	43 min
May 1, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	34 min
May 1, 7:21 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	24 min
May 1, 7:24 PM CDT	Tornado Warning	OUN	Noble, Payne	21 min
May 1, 7:26 PM CDT	Tornado Warning	OUN	Lincoln, Logan, Payne	34 min
May 1, 7:28 PM CDT	Tornado Warning	OUN	Lincoln, Oklahoma	47 min
May 1, 7:43 PM CDT	Tornado Warning	OUN	Noble, Payne	17 min
May 1, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	11 min
May 1, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	44 min
May 1, 8:36 PM CDT	Tornado Warning	OUN	Lincoln, Payne	39 min
May 1, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Payne	16 min
May 1, 10:25 PM CDT	Severe Thunderstorm Warning	OUN	Grant	20 min
May 1, 10:38 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	37 min
May 1, 11:25 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	35 min
May 1, 11:33 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	27 min
May 1, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble, Payne	48 min
May 2, 12:02 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	28 min
May 2, 12:20 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	40 min
May 2, 12:26 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Logan, McClain, Oklahoma and 1 more	34 min
May 2, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	47 min
May 2, 12:52 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Payne	38 min
May 2, 1:00 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	30 min
May 2, 1:04 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	26 min
May 2, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Stephens	49 min
May 2, 1:31 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Pottawatomie, Seminole	44 min
May 2, 2:46 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc	45 min
May 2, 10:04 AM CDT	Red Flag Warning	OUN	Ellis, Harper, Woods, Woodward	9 hr
May 2, 4:49 PM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 13 more	8 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008 Every severe thunderstorm warning in 2008

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.