Alert archive / Texas / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 189, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 26, 2015, 5:34 PM CDT for Knox County, Texas. It was in force for 26 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
- Apr 26, 2015, 5:34 PM CDT (22:34 UTC)
- Expired
- Apr 26, 2015, 6:00 PM CDT
- In force
- 26 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Knox County, TX
The radar
The Altus AFB radar (KFDR), 110 km from the middle of the area, began a volume at 22:36 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 |
|---|---|---|---|
| Apr 26, 1:06 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 10.6 hours before the alert went out and 244 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3257 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 26, 3:27 PM CDT, 2 hours 7 minutes earlier.
Area forecast discussion, Apr 26, 3:27 PM CDT, 2 hours 7 minutes before
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</html>Hazardous weather outlook, Apr 26, 3:19 PM CDT, 2 hours 15 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NORMAN OK 319 PM CDT SUN APR 26 2015 OKZ004>048-050>052-TXZ083>090-272030- HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD- NOBLE-ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE- BECKHAM-WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN- CLEVELAND-POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON- TILLMAN-COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON- JEFFERSON-CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN- FOARD-WILBARGER-WICHITA-KNOX-BAYLOR-ARCHER-CLAY- 319 PM CDT SUN APR 26 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN... WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... .THUNDERSTORMS... THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER WESTERN NORTH TEXAS AND PORTIONS OF SOUTHWEST OKLAHOMA... THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS MOST OF SOUTHERN OKLAHOMA. LOCATION... THE ENHANCED RISK EXTENDS SOUTH OF A LINE FROM ALTUS TO WAURIKA. THE SLIGHT RISK INCLUDES ALL AREAS ALONG AND SOUTH OF A LINE FROM ARNETT... TO NORMAN... TO HOLDENVILLE OKLAHOMA. TIMING... NOON TO MIDNIGHT IMPACTS... THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING DESTRUCTIVE HAIL TO THE SIZE OF BASEBALLS AND 60 TO 70 MPH DAMAGING WIND GUSTS. A FEW TORNADOES WILL ALSO BE POSSIBLE... ESPECIALLY ACROSS PORTIONS OF NORTHERN TEXAS AND SOUTHWESTERN OKLAHOMA. ADDITIONALLY... LOCALIZED HEAVY RAINFALL MAY LEAD TO FLASH FLOODING. DISCUSSION... A FRONTAL BOUNDARY HAS STALLED NEAR THE RED RIVER AND A DEEPENING AREA OF LOW PRESSURE ACROSS WEST TEXAS WILL ALLOW A DRYLINE TO MIX EASTWARD... FROM SOUTHWESTERN OKLAHOMA INTO CENTRAL TEXAS THROUGH THE AFTERNOON HOURS. SOUTHEAST WINDS AHEAD OF THE DRYLINE WILL ALLOW CONTINUAL TRANSPORT OF ABUNDANT LOW LEVEL MOISTURE... WHICH WILL COMBINE WITH SUFFICIENT HEATING FOR THE PRODUCTION OF MODERATE INSTABILITY. MEANWHILE... A STRONG UPPER LEVEL STORM SYSTEM WILL CONTINUE TO MOVE INTO THE UNSTABLE AIRMASS THIS AFTERNOON... RESULTING IN RAPID THUNDERSTORM DEVELOPMENT ALONG BOTH THE DRYLINE AND THE STALLED FRONT... WHICH MAY BEGIN A SLOW RETREAT NORTHWARD LATE IN THE DAY. INITIAL STORMS WILL LIKELY BECOME SEVERE RAPIDLY. COLD TEMPERATURES ALOFT WILL PROMOTE LARGE HAIL GROWTH... AND SHEAR WILL SUPPORT HAIL TO THE SIZE OF BASEBALLS IN THE STRONGEST STORMS. THIS POTENTIAL WILL BE GREATEST ACROSS NORTHERN TEXAS INTO SOUTHWESTERN AND FAR SOUTHERN OKLAHOMA. AS AN AREA OF BACKED SURFACE WINDS DEVELOPS DURING THE LATE AFTERNOON AND EARLY EVENING... LOW LEVEL SHEAR WILL INCREASE THE CHANCE FOR TORNADO DEVELOPMENT WITHIN THE STRONGEST STORMS ACROSS PORTIONS OF NORTHERN TEXAS AND POTENTIALLY INTO FAR SOUTHWESTERN OKLAHOMA. ONE OR MORE STORM CLUSTERS MAY DEVELOP DURING THE EVENING AND OVERNIGHT HOURS. WITH ADEQUATE INSTABILITY AND FAVORABLE WIND PROFILES... SEVERE THUNDERSTORM POTENTIAL IS LIKELY TO LINGER INTO THE EARLY OVERNIGHT... WITH THE MAIN CONCERN BEING LARGE HAIL AND STRONG WIND GUSTS. HEAVY RAINFALL WILL LIKELY ACCOMPANY SOME OF THE STORMS... AND AREAS THAT RECEIVE PROLONGED RAINFALL WITH SEVERAL ROUNDS OF STORMS WILL LIKELY SEE FLOODING. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE RISK AREA SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON AND TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... .THUNDERSTORMS... THE THREAT OF SEVERE STORMS SHOULD DIMINISH BY EARLY MONDAY... BUT A FEW STRONG STORMS WILL REMAIN POSSIBLE... WITH HAIL AND GUSTY WINDS THE PRIMARY CONCERNS. RAIN IS LIKELY TO LINGER INTO AT LEAST TUESDAY MORNING... BEFORE GRADUALLY WINDING DOWN DURING THE DAY. THE PRIMARY CONCERN MONDAY AND TUESDAY WILL BE THE EVER INCREASING FLOOD POTENTIAL DUE TO PROLONGED HEAVY RAINFALL. AT THIS TIME... AREAS OF WEST CENTRAL INTO CENTRAL... AND SOUTHERN OKLAHOMA... APPEAR TO HAVE THE GREATEST CHANCES FOR FLASH FLOODING AND POSSIBLY RIVER FLOODING. IF MODELS CONTINUE TO DEPICT HEAVY RAINFALL IN THESE AREAS...A FLOOD WATCH MAY BECOME NECESSARY. GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK. AUSTIN/KURTZ
In the hours before
Special weather statement, Apr 26, 3:35 PM CDT, 1 hour 59 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 3:01 PM CDT | Flash Flood Watch | OUN | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 26 more | 28 hr |
| Apr 26, 3:05 PM CDT | Special Weather Statement | OUN | Jackson | 25 min |
| Apr 26, 4:06 PM CDT | Special Weather Statement | OUN | Comanche | 24 min |
| Apr 26, 4:21 PM CDT | Special Weather Statement | OUN | Comanche | 24 min |
| Apr 26, 4:38 PM CDT | Special Weather Statement | OUN | Comanche | 37 min |
| Apr 26, 6:39 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 51 min |
| Apr 26, 1:11 PM CDT | Special Weather Statement | OUN | Knox | 49 min |
| Apr 26, 1:22 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Knox | 53 min |
| Apr 26, 1:42 PM CDT | Special Weather Statement | OUN | Foard | 33 min |
| Apr 26, 1:58 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Hardeman | 29 min |
| Apr 26, 2:36 PM CDT | Special Weather Statement | OUN | Wilbarger | 24 min |
| Apr 26, 2:37 PM CDT | Special Weather Statement | OUN | Knox | 23 min |
| Apr 26, 3:35 PM CDT | Special Weather Statement | OUN | Foard | 25 min |
| Apr 26, 5:04 PM CDT | Special Weather Statement | OUN | Baylor, Knox | 26 min |
| Apr 26, 5:22 PM CDT | Special Weather Statement | OUN | Knox | 23 min |
| Apr 26, 6:04 PM CDT | Special Weather Statement | OUN | Hardeman | 26 min |
| Apr 26, 6:19 PM CDT | Special Weather Statement | OUN | Knox | 26 min |
| Apr 26, 6:33 PM CDT | Special Weather Statement | OUN | Foard | 27 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015
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.