Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 608, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 2, 2009, 11:26 PM CDT for Alfalfa County, Major County, Woods County, Oklahoma. It was in force for 64 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
- Aug 2, 2009, 11:26 PM CDT (04:26 UTC)
- Expired
- Aug 3, 2009, 12:30 AM CDT
- In force
- 64 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Alfalfa County, OK, Major County, OK, Woods County, OK
The radar
The Vance AFB radar (KVNX), 43 km from the middle of the area, began a volume at 04:29 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
Dodge City, (KDDC), launched 00:00Z, 4.4 hours before the alert went out and 175 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
- 2948 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1589 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 8.7
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 Aug 2, 10:50 PM CDT, 36 minutes earlier.
Area forecast discussion, Aug 2, 10:50 PM CDT, 36 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 1050 PM CDT SUN AUG 2 2009 .AVIATION... VFR CONDITIONS STILL TO PREVAIL ACROSS TERMINALS. STORMS NORTH AND WEST OF KGAG/KWWR/KCSM/KHBR LASTING LONGER THAN PREVIOUSLY EXPECTED. ALTHOUGH LARGER SCALE FORCING WEAK...THEY ARE MOVING INTO ELEVATED INSTABILITY AND MODEST LOW-LEVEL JET ACROSS FAR WESTERN OKLAHOMA. WILL GO AHEAD AND MENTION IN FAR NORTHWEST OKLAHOMA TAFS WITH BRIEF MVFR CEILINGS/VSBY RESTRICTIONS POSSIBLE FOR THE FIRST FEW HOURS OF FORECAST. SOUTHWEST LOW-LEVEL FLOW WILL INCREASE FAIRLY SIGNIFICANTLY TOWARD AND AFTER 12Z TOMORROW. ADDITIONAL STORMS NEAR KANSAS/OKLAHOMA BORDER LATE TOMORROW WILL NOT BE INCLUDED IN THIS ISSUANCE DUE TO MODEL INCONSISTENCY AND LACK OF CONFIDENCE. && .DISCUSSION... ISOLATED SHOWERS OR A THUNDERSTORM MAY OCCUR IN NORTHWEST OKLAHOMA THIS EVENING OR LATER WHEN A SURFACE THROUGH MOVES THROUGH THE CENTRAL PLAINS AND PREVAILING FLOW WOULD ALLOW ANY SHOWERS FROM SOUTHEAST COLORADO OR SOUTHWEST KANSAS TO MOVE INTO OKLAHOMA. THIS IS AN OUTSIDE CHANCE. OTHERWISE, A BIG WARM-UP BEGINS TOMORROW AND CONTINUES THROUGH TUESDAY WHEN SOUTHWEST WINDS DEVELOP ACROSS THE SOUTHERN PLAINS BRINGING DOWNSLOPE CONDITIONS TO OKLAHOMA. A WEAK UPPER TROUGH MID-WEEK WILL BRING A FRONT INTO KANSAS, BUT THE AVN HAS WEAKENED THIS FRONT IN THE RECENT RUN. THIS APPEARS TO BE THE BEST, BUT SLIM CHANCE FOR RAIN THROUGH NEXT WEEKEND. THERE MAY BE A SLIGHT BREAK IN THE HEAT IN THE WEEKEND IF THE UPPER HIGH BUILDS OVER THE SOUTHEAST STATES INSTEAD OF THE WESTERN PLAINS. && .PRELIMINARY POINT TEMPS/POPS... OKLAHOMA CITY OK 71 98 74 99 / 0 0 0 0 HOBART OK 72 101 73 101 / 0 0 0 0 WICHITA FALLS TX 74 101 74 101 / 0 0 0 0 GAGE OK 71 101 72 101 / 10 0 0 10 PONCA CITY OK 69 98 75 99 / 10 0 10 10 DURANT OK 73 95 74 97 / 0 0 0 0 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...NONE. TX...NONE. && 23/09
Hazardous weather outlook, Aug 2, 11:45 AM CDT, 11 hours 41 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.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Special weather statement, Aug 2, 9:46 PM CDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
946 PM CDT SUN AUG 2 2009
OKZ005-030300-
WOODS OK-
946 PM CDT SUN AUG 2 2009
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR WOODS COUNTY.
A STRONG THUNDERSTORM WAS LOCATED 14 MILES NORTHWEST OF ALVA AT 946
PM CDT...MOVING SOUTHEAST AT 25 MPH.
STORM INTENSITY IS INCREASING AND SEVERE WEATHER MAY DEVELOP
RAPIDLY. THE PRIMARY CONCERN WITH ANY SEVERE WEATHER WILL BE LARGE
HAIL.
LAT...LON 3688 9857 3672 9872 3692 9902 3700 9894
3700 9878Special weather statement, Aug 2, 9:57 PM CDT, 1 hour 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 957 PM CDT SUN AUG 2 2009 OKZ005-006-030315- WOODS OK-ALFALFA OK- 957 PM CDT SUN AUG 2 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA AND WOODS COUNTIES. A STRONG THUNDERSTORM WAS LOCATED 7 MILES NORTHWEST OF ALVA AT 957 PM CDT...MOVING EAST AT 25 MPH. SMALL HAIL AND WINDS AROUND 45 MPH ARE POSSIBLE. LAT...LON 3691 9842 3671 9852 3684 9884 3698 9875
Special weather statement, Aug 2, 10:11 PM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1011 PM CDT SUN AUG 2 2009
OKZ005-006-030330-
WOODS OK-ALFALFA OK-
1011 PM CDT SUN AUG 2 2009
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA AND WOODS COUNTIES.
A STRONG THUNDERSTORM WAS LOCATED 7 MILES WEST OF CAPRON AT 1011 PM
CDT...MOVING SOUTHEAST AT 15 MPH.
SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.
LAT...LON 3693 9842 3671 9856 3687 9877 3700 9871
3700 9870Special weather statement, Aug 2, 11:04 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 1104 PM CDT SUN AUG 2 2009 OKZ005-006-030430- WOODS OK-ALFALFA OK- 1104 PM CDT SUN AUG 2 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA AND WOODS COUNTIES. A STRONG THUNDERSTORM WAS LOCATED OVER ALVA AT 1103 PM CDT...MOVING SOUTH AT 15 MPH. OTHER STORMS WERE LOCATED NEAR ALINE AND LAMBERT. SMALL HAIL AND WINDS AROUND 40 MPH ARE POSSIBLE. LAT...LON 3647 9832 3648 9869 3684 9879 3687 9840
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 12:26 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Major, Woods | 64 min |
| Aug 3, 1:25 AM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 65 min |
| Aug 3, 2:20 AM CDT | Severe Thunderstorm Warning | OUN | Canadian, Kingfisher | 55 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm warning in 2009
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.