Alert archive / Texas / Tornado Warnings in 2015
Tornado Warning 9, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Apr 22, 2015, 9:33 PM CDT for Knox County, Texas. It was in force for 42 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 22, 2015, 9:33 PM CDT (02:33 UTC)
- Expired
- Apr 22, 2015, 10:15 PM CDT
- In force
- 42 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
County Knox County, TX
The radar
The Dyess AFB radar (KDYX), 119 km from the middle of the area, began a volume at 02:35 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 22, 9:50 PM CDT | TORNADO | 6 Nw Knox City, TX | A BRIEF ROPE TORNADO REPORTED BY KNOX COUNTY EM |
| Apr 22, 10:19 PM CDT | TORNADO | 5 N Knox City, TX | BRIEF TOUCHDOWN. RELAYED BY NWS EMPLOYEE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 22, 2:56 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 2.6 hours before the alert went out and 249 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
- 800 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1005 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.3
The text
As transmitted, in the capitals the NWS used until 2016.
559
WFUS54 KOUN 230233
TOROUN
TXC275-230315-
/O.NEW.KOUN.TO.W.0009.150423T0233Z-150423T0315Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
933 PM CDT WED APR 22 2015
THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHWESTERN KNOX COUNTY IN NORTHERN TEXAS...
* UNTIL 1015 PM CDT
* AT 933 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED 12 MILES NORTHWEST OF KNOX CITY...MOVING EAST
AT 30 MPH.
HAZARD...TORNADO AND TENNIS BALL SIZE HAIL.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED.
DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE
DAMAGE IS LIKELY.
* LOCATIONS IMPACTED INCLUDE...
MUNDAY...KNOX CITY...BENJAMIN AND RHINELAND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A STORM SHELTER... SAFE ROOM OR AN INTERIOR
ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A
MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3340 9999 3362 9999 3362 9965 3340 9963
TIME...MOT...LOC 0233Z 285DEG 24KT 3350 10000
TORNADO...RADAR INDICATED
HAIL...2.50IN
$$
AUSTIN2 follow-up statements
158
WWUS54 KOUN 230300
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1000 PM CDT WED APR 22 2015
TXC275-230315-
/O.CON.KOUN.TO.W.0009.000000T0000Z-150423T0315Z/
KNOX TX-
1000 PM CDT WED APR 22 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
SOUTHWESTERN KNOX COUNTY...
AT 958 PM CDT...A STORM WITH A HISTORY OF PRODUCING TORNADOES WAS
LOCATED NEAR KNOX CITY...MOVING EAST TO EAST TO SOUTHEAST AT 30 MPH.
HAZARD...TORNADO AND TENNIS BALL SIZE HAIL.
SOURCE...EMERGENCY MANAGEMENT CONFIRMED TORNADO.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.
LOCATIONS IMPACTED INCLUDE...
MUNDAY...KNOX CITY...BENJAMIN AND RHINELAND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
STORM SHELTER... SAFE ROOM OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF
A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3340 9999 3362 9999 3362 9965 3340 9963
TIME...MOT...LOC 0258Z 285DEG 24KT 3346 9980
TORNADO...OBSERVED
HAIL...2.50IN
$$
AUSTIN839
WWUS54 KOUN 230303
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1003 PM CDT WED APR 22 2015
TXC275-230315-
/O.CON.KOUN.TO.W.0009.000000T0000Z-150423T0315Z/
KNOX TX-
1003 PM CDT WED APR 22 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
SOUTHWESTERN KNOX COUNTY...
AT 1001 PM CDT...A STORM WITH A HISTORY OF PRODUCING TORNADOES
WAS LOCATED NEAR KNOX CITY...MOVING EAST AT 30 MPH. ANOTHER
POTENTIALLY TORNADIC STORM WAS LOCATED ABOUT 12 MILES WEST OF
BENJAMIN...AND WAS ALSO MOVING EAST AT 30 MPH.
HAZARD...TORNADO AND TENNIS BALL SIZE HAIL.
SOURCE...EMERGENCY MANAGEMENT CONFIRMED TORNADO.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.
LOCATIONS IMPACTED INCLUDE...
MUNDAY...KNOX CITY...BENJAMIN AND RHINELAND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
STORM SHELTER... SAFE ROOM OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF
A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3340 9999 3362 9999 3362 9965 3340 9963
TIME...MOT...LOC 0301Z 285DEG 24KT 3345 9978
TORNADO...OBSERVED
HAIL...2.50IN
$$The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:14 PM CDT | Special Weather Statement | OUN | Clay | 46 min |
| Apr 22, 8:55 PM CDT | Special Weather Statement | OUN | Foard | 50 min |
| Apr 22, 9:11 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Knox | 79 min |
| Apr 22, 10:12 PM CDT | Tornado Warning | OUN | Baylor, Knox | 48 min |
| Apr 22, 10:45 PM CDT | Areal Flood Advisory | OUN | Knox | 3 hr |
| Apr 22, 11:45 PM CDT | Special Weather Statement | OUN | Archer, Baylor, Clay, Wichita | 60 min |
| Apr 23, 12:15 AM CDT | Special Weather Statement | OUN | Archer, Clay | 60 min |
Nearby
Tornado Warnings in Texas, 2015Every tornado warning in 2015Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.