Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 472, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Sep 7, 1999, 5:11 PM CDT for Osage County, Oklahoma. It was in force for 49 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
- Sep 7, 1999, 5:11 PM CDT (22:11 UTC)
- Expired
- Sep 7, 1999, 6:00 PM CDT
- In force
- 49 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Osage County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 7, 6:05 PM CDT | Hail 2 | Tallant, OK | There was a report of 1" hail at Tallant at 605 PM and a report of 2" hail at Nelagoney at 615 PM CDT. |
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 |
|---|---|---|---|
| Sep 7, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lamont, OK (KLMN), launched 12:00Z, 10.2 hours before the alert went out and 97 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.
- Mixed-layer CAPE
- 1187 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1422 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 7, 3:35 PM CDT, 1 hour 36 minutes earlier.
Area forecast discussion, Sep 7, 3:35 PM CDT, 1 hour 36 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 335 PM CDT TUE SEP 7 1999 PROBLEM(S) OF THE DAY: POPS TEMPERATURES RADAR...SAT PICS AND LIGHTNING DATA SHOWING SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPING AT FORECAST TIME. APPARENTLY THESE ARE DUE TO STRONG HEATING...BROKEN CAP AND A SHORTWAVE DEPICTED BY BOTH THE ETA AND NGM OVER EASTERN OKLAHOMA AND EASTERN KANSAS LATE THIS AFTERNOON AND EVENING. ALL IN ALL FWC'S 50 PERCENT POPS FOR TONIGHT DO NOT LOOK BAD SO HAVE STUCK WITH THEM. THIS AFTERNOON'S CONVECTION MAY DIE DOWN THIS EVENING BUT THERE WILL A CHANCE FOR MORE WITH THE WELL ADVERTISED FRONTAL PASSAGE. THE MODELS HAVE THE SAME GENERAL IDEA WITH THE FRONT BUT DIFFER SOME IN SPEED. MOS WANTS WINDS TO SHIFT LATE TONIGHT AT KTUL WHILE SURFACE WINDS FROM ETA AND AVN WOULD INDICATE A FRONTAL PASSAGE SOMETIME DURING THE MORNING. HAVE SIDED WITH THE ETA AND AVN BASED ON THE DYNAMICS DRIVING THE FRONT BEING WELL TO THE NORTH OVER THE UPPER MIDWEST. THINK POPS TOMORROW WILL BE BEST IN THE SOUTH WHERE THE FRONT WILL PASS AFTER SOME DECENT HEATING OCCURS. FRONT DOES NOT QUITE CLEAR THE RED RIVER COUNTIES UNTIL TOMORROW EVENING SO WILL CARRY SOME POPS THERE TOMORROW NIGHT. QUESTION IS WHAT WILL TEMPS DO. LOWEST 8H TEMPS OCCUR THURSDAY BUT SHOULD HAVE FULL SUN THAT DAY. COULD HAVE SOME CLOUDINESS TOMORROW DUE TO THE TSRA THREAT. THUS...HAVE GONE FOR SIMILAR TO SLIGHTLY WARMER TEMPS THURSDAY AS TOMORROW. COOLEST TEMPERATURES NIGHTTIME WISE WILL LIKELY OCCUR THURSDAY NIGHT AS VERY DRY AIR FULLY SETTLES IN OVER THE AREA AND WINDS BECOME CALM. SHOULD SEE A WARMUP BEGINNING FRIDAY AS THERMAL GRADIENT BEGINS TO SHIFT EAST. THE EXTENDED FORECAST IS ANOTHER CHALLENGE. BOTH THE ECWMF AND MRF ARE SIMILAR THURSDAY NIGHT INTO SATURDAY WITH A WAV FLATTENING THE WESTERN RIDGE. FROM THERE THEY DIVERGE. THE MRF BRINGS THE WAVE THROUGH KANSAS AND MISSOURI WITH LITTLE SURFACE REFLECTION. THE ECMWF CUTS OFF A LOW OVER MINNESOTA AND DRIVES A COLD FRONT ACROSS THE AREA SATURDAY NIGHT. IN STAYING THE COURSE OF THE MID SHIFTS IDEAS AND KNOWING THE PATTERN WE HAVE BEEN IN HAVE LOOSELY FOLLOWED THE ECMWF. WILL KEEP WARMUP AND SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE FORECAST WE HAVE FOR SATURDAY. THEN WILL COOL THINGS OFF SLIGHTLY FOR SUNDAY. FCSTID = 17 TUL 70 85 58 85 / 50 30 0 0 FSM 70 88 58 85 / 50 50 0 0 MLC 70 87 60 86 / 50 50 0 0 BVO 66 83 56 85 / 50 20 0 0 FYV 63 83 53 82 / 50 30 0 0 BYV 62 84 52 83 / 50 30 0 0 MIO 65 83 55 83 / 50 30 0 0 MKO 69 85 57 85 / 50 30 0 0 F10 70 86 58 86 / 50 30 0 0 HHW 70 92 63 88 / 50 50 20 0 .TUL... AR...NONE. OK...NONE. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SEVERE THUNDERSTO@RMS NGM CONFIDENCE: 7 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 8 ON A SCALE OF 0 TO 10 AVN CONFIDENCE: 7 ON A SCALE OF 0 TO 10 FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10
In the hours before
Special weather statement, Sep 7, 4:00 PM CDT, 1 hour 11 minutes before
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</html>Special weather statement, Sep 7, 4:00 PM CDT, 1 hour 11 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
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<p class="small" id="detail">
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</html>The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 3:48 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 42 min |
| Sep 7, 4:27 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 48 min |
| Sep 7, 4:58 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Pawnee, Tulsa | 47 min |
| Sep 7, 5:24 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 51 min |
| Sep 7, 5:52 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 38 min |
| Sep 7, 6:30 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Washington | 45 min |
| Sep 7, 6:34 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 41 min |
| Sep 7, 6:45 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 45 min |
| Sep 7, 6:51 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee | 39 min |
| Sep 7, 6:55 PM CDT | Severe Thunderstorm Warning | TSA | Nowata | 50 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1999Every 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.