Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 309, NWS Tulsa, OK

July 28, 2001Adair County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 28, 2001, 8:40 PM CDT for Adair County, Sequoyah County, Oklahoma. It was in force for 50 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: Jul 28, 2001, 8:40 PM CDT (01:40 UTC)
Expired: Jul 28, 2001, 9:30 PM CDT
In force: 50 min
Issued by: NWS Tulsa, OK
Area: Whole counties

Counties Adair County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 54 km from the middle of the area, began a volume at 01:40 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 nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.7 hours before the alert went out and 157 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: 2422 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 290140
SVRTUL

OKC001-135-290230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
840 PM CDT SAT JUL 28 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA   
  SOUTHERN ADAIR COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 930 PM CDT

* AT 840 PM CDT...DOPPLER RADAR INDICATED A DANGEROUS SEVERE
  THUNDERSTORM ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF BUNCH
  TO 5 MILES EAST OF BUNCH TO 4 MILES NORTH OF BRUSHY...MOVING
  SOUTHEAST AT 15 MPH. RADAR INDICATED SOME ROTATION WITH THIS STORM.
  PEOPLE NEAR ITS PATH SHOULD MOVE TO A SAFE PLACE NOW!

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...  MARBLE
  CITY...SHORT...BRUSHY AND BUNCH.

WIND GUSTS TO 70 MPH CAN BE EXPECTED IN THE WARNED AREA.

IF YOU ARE IN OR NEAR THE PATH OF THIS STORM...TAKE COVER NOW! IF NO
UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. AVOID WINDOWS!

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES SUDDENLY. IF YOU ARE NEAR
THE PATH OF THIS STORM...YOU SHOULD BE ALERT FOR RAPIDLY CHANGING
WEATHER CONDITIONS AND BE READY TO ACT QUICKLY.

$$

MANNING

LAT...LON 3583 9474 3571 9475 3559 9485 3542 9456
          3553 9445 3574 9450

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 28, 2:06 PM CDT, 6 hours 34 minutes earlier.

Area forecast discussion, Jul 28, 2:06 PM CDT, 6 hours 34 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
206 PM CDT SAT JUL 28 2001

MAIN CHALLENGE THIS FORECAST WILL BE FIRST PERIOD POPS AS CONVECTIVE
COMPLEX DEVELOPS AND MOVES ACROSS PARTS OF AREA. 12Z AVN MODEL MAY
HAVE BEST DEPICTION OF QPF FOR TONIGHT AND EARLY SUNDAY.

APPEARS THAT BEST CHANCE OF WIDESPREAD RAINS TONIGHT WILL BE ACROSS
NORTHEAST OKLAHOMA AND EXTREME NORTHWEST ARKANSAS. CLUSTERS OF
STORMS WERE DEVELOPING ALONG AND NORTH OF AN OUTFLOW BOUNDARY ACROSS
EXTREME NORTHERN OKLAHOMA AT THIS TIME...AND THIS ACTIVITY MAY
ORGANIZE THIS EVENING AND MOVE EAST SOUTHEAST. WILL GO WITH HIGHEST
POPS IN THOSE ZONES NORTH AND EAST OF TULSA...WITH POPS TAPERING OFF
TO 20 IN FAR SOUTHEAST OKLAHOMA. MAY RAISE TONIGHTS POPS INTO LIKELY
CATEGORY IN SOME ZONES BASED ON RADAR TRENDS AT 4 PM ISSUANCE TIME.

AFTER COMPLEX OF STORMS DISSIPATES OR MOVES SOUTHEAST OF THE AREA BY
EARLY SUNDAY AFTERNOON...THE PATTERN SHOULD RETURN TO HOT AND DRY
FOR MOST OF THE UPCOMING WEEK. UPPER RIDGING REDEVELOPS ACROSS
OKLAHOMA BEHIND TONIGHTS SHORTWAVE...AND TEMPERATURES SHOULD AGAIN
RISE TO NEAR THE CENTURY MARK IN WESTERN ZONES BEGINNING MONDAY.

WILL KEEP EXTENDED DRY WITH HOT AFTERNOONS. COULD BE SOME ISOLATED
THUNDERSTORMS IN THE USUAL TERRAIN-FAVORED AREAS OF NORTHWEST
ARKANSAS...BUT OTHERWISE EXPECT HOT/HUMID AFTERNOONS WITH LITTLE DAY
TO DAY TEMPERATURE CHANGE.

FCSTID = 9

FIRST PERIOD POPS SUBJECT TO CHANGE...

TUL   75  97  78  99 /  40  10  10  10
FSM   75  98  76  99 /  40  30  10  10
MLC   75  98  76  99 /  30  20  10  10
BVO   73  97  74  99 /  50  10  10  10
FYV   70  92  71  93 /  50  20  10  10
BYV   70  92  70  93 /  50  20  10  10
MIO   71  94  72  95 /  50  20  10  10
MKO   75  97  77  99 /  40  10  10  10
F10   75  97  77  99 /  40  10  10  10
HHW   75  96  76  98 /  20  30  10  10

.TSA...
AR...NONE.
OK...NONE.

In the hours before

Local storm report, Jul 28, 5:32 PM CDT, 3 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
532 PM CDT SAT JUL 28 2001

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

0325 PM    NOWATA                    OK    70 MPH TSTM GUST
07/28/01   NOWATA                          POWER LINES DOWNED.
                                           AMATEUR RADIO ANTENNA
                                           BLOWN DOWN. SEVERAL
                                           TREES DOWNED.

Local storm report, Jul 28, 6:09 PM CDT, 2 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
609 PM CDT SAT JUL 28 2001

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

0545 PM    BERRYVILLE                AR   WIND DAMAGE
07/28/01   CARROLL                        TREES DOWN. REPORTED BY
                                          SHERIFFS OFFICE.

0550 PM    GREEN FOREST              AR   WIND DAMAGE
07/28/01   CARROLL                        NUMEROUS TREES AND
                                          POWERLINES DOWN. TREES
                                          BLOWN ONTO ROOFS.
                                          REPORTED BY SHERIFFS
                                          OFFICE.

MANNING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 10:01 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	59 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning in 2001

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.