Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 331, NWS Tulsa, OK

May 31, 1999Rogers County, Tulsa County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 31, 1999, 4:49 AM CDT for Rogers County, Tulsa County, Oklahoma. It was in force for 41 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 31, 1999, 4:49 AM CDT (09:49 UTC)
Expired: May 31, 1999, 5:30 AM CDT
In force: 41 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Rogers County, OK, Tulsa County, OK

What was reported inside it

Time	Report	Where	Remark
May 31, 4:53 AM CDT	Thunderstorm Wind	Collinsville, OK	In Collinsville, a 150-year old tree was blown onto a house, leaving a large hole in the roof. In Owasso, tree limbs were blown down, and the roof was blown off of a metal shed.
May 31, 5:10 AM CDT	Hail 0.75	Owasso, 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 31, 4:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 9.8 hours before the alert went out and 182 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: 346 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

999 
WUUS54 KTSA 310952 RRA
SVRTUL
OKC131-143-311030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
449 AM CDT MON MAY 31 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
  ROGERS COUNTY IN NORTHEAST OKLAHOMA
  NORTHERN TULSA COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 530 AM CDT

* AT 449 AM CDT SEVERE THUNDERSTORM CAPABLE OF PRODUCING WINDS UP TO 
70 MPH WERE LOCATED 3 MILES WEST OF VERA...MOVING SOUTHEAST AT 40 
MPH.

* SOME LOCATIONS AFFECTED INCLUDE...  COLLINSVILLE...OWASSO...
  OOLOGAH...FOYIL...TIAWAH...VERDIGRIS AND CLAREMORE

LAT...LON 3653 9588 3628 9600 3616 9550 3648 9547

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 May 31, 3:55 AM CDT, 54 minutes earlier.

Area forecast discussion, May 31, 3:55 AM CDT, 54 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
355 AM CDT MON MAY 31 1999

PROBLEM(S) OF THE DAY:
POPS
TEMPERATURES

MCS MOVING SOUTHEAST THROUGH KANSAS HAS MERGED WITH LINE OF STORMS
MOVING EAST ACROSS KANSAS/OKLAHOMA BORDER. THESE STORMS ARE JUST NOW
ENTERING NORTHEAST OKLAHOMA. HAVE STAGGERED POPS FROM LIKELY NORTH TO
CHANCE FAR SOUTH THIS MORNING. STORMS ARE MOVING INTO SLIGHTLY MORE
STABLE AIR BUT GOOD MOISTURE AVAILABLE.

MODELS CONTINUE TO HAVE TROUBLE AS FAR AS SURFACE FEATURES THROUGH 48
HOURS. SEVERAL SURFACE LOWS RIDE NORTHEAST ALONG FRONT OVER
TEXAS/OKLAHOMA PANHANDLES UP INTO SOUTHEAST NEBRASKA. EXACT POSITION
IS HARD TO PREDICT...BUT APPEARS FRONT WILL SLOWLY PUSH TO THE EAST
THIS EVENING. EXPECT MCS TO DEVELOP OVER WESTERN KANSAS LATE THIS
EVENING AND MAKE IT INTO CWA SHORTLY AFTER MIDNIGHT JUST AHEAD OF
COLD FRONT. WILL LEAVE CHANCE POPS IN EVERYWHERE THIS AFTERNOON...
TONIGHT AND TUESDAY WITH SLIGHT CHANCE LINGERING THROUGH EARLY
MORNING WEDNESDAY. GUIDANCE TEMPS LOOK CLOSE AND HAVE GONE WITH
COMPROMISE. REST OF EXTENDED LOOKS ON TRACK AND WILL MAKE NO CHANGES
AT THIS TIME.

FCSTID = 33
TUL   88  69  86  66 /  60  50  30  20
FSM   89  68  86  66 /  50  30  30  20
MLC   89  69  87  67 /  50  40  30  20
BVO   87  68  84  65 /  60  50  30  20
FYV   86  66  84  64 /  60  30  30  20
IDB   90  67  87  66 /  30  30  20  20
BYV   86  66  84  64 /  60  30  30  20
MIO   86  67  84  65 /  60  40  30  20
MKO   88  69  86  66 /  60  50  30  20
F10   89  69  87  67 /  60  50  30  20
HHW   90  67  87  66 /  30  30  20  20

.TUL...
AR...NONE.
OK...NONE.
--------------------
EXPERIMENTAL OUTPUT:

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SEVERE THUNDERSTORMS
NGM CONFIDENCE:  6 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  7 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 7 ON A SCALE OF 0 TO 10

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 2:27 AM CDT	Severe Thunderstorm Warning	TSA	Osage	63 min
May 31, 4:01 AM CDT	Severe Thunderstorm Warning	TSA	Osage	59 min
May 31, 4:14 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	61 min
May 31, 4:58 AM CDT	Severe Thunderstorm Warning	TSA	Osage	47 min
May 31, 5:31 AM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers	44 min
May 31, 6:00 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Wagoner	45 min
May 31, 6:17 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	43 min
May 31, 6:44 AM CDT	Severe Thunderstorm Warning	TSA	Adair	46 min
May 31, 6:58 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, Pittsburg	47 min
May 31, 6:58 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee	47 min
May 31, 7:40 AM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg, Pushmataha	50 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every severe thunderstorm warning in 1999

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.