Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 36, NWS Amarillo, TX
NWS Amarillo, TX issued this severe thunderstorm warning at Apr 21, 2001, 5:39 PM CDT for Donley County, Texas. It was in force for 66 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
- Apr 21, 2001, 5:39 PM CDT (22:39 UTC)
- Expired
- Apr 21, 2001, 6:45 PM CDT
- In force
- 66 min
- Issued by
- NWS Amarillo, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Donley County, TX
The radar
The Amarillo radar (KAMA), 82 km from the middle of the area, began a volume at 22:42 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 21, 5:55 PM CDT | Hail 1 | Clarendon, TX | |
| Apr 21, 5:59 PM CDT | Hail 0.75 | Howardwick, TX |
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 |
|---|---|---|---|
| Apr 21, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.7 hours before the alert went out and 81 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
- 4057 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
385 WUUS54 KAMA 212240 SVRAMA TXC129-212345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AMARILLO TX 539 PM CDT SAT APR 21 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... DONLEY COUNTY IN THE TEXAS PANHANDLE * UNTIL 645 PM CDT * AT 539 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF CLARENDON...MOVING NORTHEAST AT 45 MPH. * SOME LOCATIONS AFFECTED BY THE STORM INCLUDE... CLARENDON...GREENBELT LAKE...HEDLEY...HOWARDWICK AND LELIA LAKE LARGE HAIL...DAMAGING WINDS...AND TORRENTIAL RAINS ARE EXPECTED WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER. LAT...LON 3477 10109 3478 10062 3515 10060 3517 10105
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 Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 2:44 PM CDT, 2 hours 55 minutes earlier.
Area forecast discussion, Apr 21, 2:44 PM CDT, 2 hours 55 minutes before
TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION NATIONAL WEATHER SERVICE AMARILLO TX 244 PM CDT SAT APR 21 2001 ATMOSPHERE IS GETTING QUITE UNSTABLE EAST OF THE DRYLINE IN WESTERN OKLAHOMA AND THE EASTERN TEXAS AND OKLAHOMA PANHANDLES. SURFACE COLD FRONT STILL LIES ACROSS THE NORTHERN TEXAS PANHANDLE. THIS BOUNDARY IS SHOWING SOME SIGNS OF MOVING NORTHWARD AS BGD HAS NOW SWITCHED AROUND TO THE SOUTHWEST. WOULD NOT BE SURPRISED TO SEE THE DRYLINE AND THE INTERSECTION BETWEEN THE COLD FRONT AND DRYLINE SET OFF A FEW STORMS THIS AFTERNOON. STORMS COULD QUICKLY BECOME SEVERE AS STRONG INSTABILITY BREAKS THROUGH WHAT CAP THERE IS. STRONG TO SEVERE STORMS ARE EXPECTED ACROSS MUCH OF THE PANHANDLES OVERNIGHT AS LOW LEVEL JET COMBINES WITH UPPER LOW PUSHING EAST ACROSS NEW MEXICO. PLENTY OF MOISTURE WILL BE BROUGHT BACK TO THE WESTERN ZONES TO MEET UP WITH THE DYNAMICS COMING OUT OF THE ROCKIES. WILL GO WITH HIGHEST POPS TONIGHT AHEAD OF DYNAMICS. DRYLINE TEAMS UP WITH PACIFIC COLD FRONT LATE TONIGHT AND DRIVES EAST...SO WILL TAPER OFF POPS TO THE WEST ON SUNDAY AS THE SYSTEM MOVES INTO THE CENTRAL HIGH PLAINS. STORMS SHOULD MOVE EAST AND NORTHEAST QUICKLY AS WINDS ALOFT INCREASE WITH JET STREAK AROUND THE EASTERN SIDE OF THE UPPER LOW. MODELS MAY BE CATCHING ON TO THE COLD AIR BEHIND THE FRONT WHICH MOVES THROUGH SUNDAY NIGHT. WE WILL LOWER SOME TEMPERATURES FOR MONDAY WITH THIS IN MIND. UPPER LEVEL RIDGE STARTS TO BUILD BACK ACROSS THE ROCKIES THROUGH MID WEEK...SO WARMER TEMPERATURES LOOK TO BE ON TRACK. WE WILL INSERT SOME SLIGHT CHANCE POPS FOR THE WEST AND CENTRAL ON THURSDAY AND FRIDAY. SEVERAL RIPPLES (SHORT WAVES) MOVE THROUGH THE MEAN RIDGE OVER THE ROCKIES/HIGH PLAINS IN THE SOUTHERN STREAM. SOME CONVECTION MAY FORM ALONG THE ROCKIES AND MOVE INTO THE AREA. WILL LEAVE SATURDAY DRY FOR NOW AS RIDGE AXIS MOVES ACROSS THE PANHANDLES AHEAD OF NEXT STRONG UPPER LOW ALONG THE WEST COAST. WE USED A BLEND OF THE MODELS FOR THIS FORECAST. THE ETA HAD A BETTER HANDLE ON THE SURFACE...WHILE THE AVN HAD A BETTER HANDLE ON THE UPPER AIR FEATURES. A FEW NUMBERS TO PONDER: DHT 51/71 38/64 36 730 AMA 57/74 40/66 39 750 BVR 60/79 45/65 39 660 .AMA... TX...NONE. OK...NONE. GOEHRING
In the hours before
Special weather statement, Apr 21, 1:09 PM CDT, 4 hours 30 minutes before
OKZ001>003-TXZ001>020-220500- TEXAS/OKLAHOMA PANHANDLES THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE AMARILLO TX 109 PM CDT SAT APR 21 2001 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON AND ESPECIALLY TONIGHT ACROSS ALL OF THE OKLAHOMA AND TEXAS PANHANDLES. A COLD FRONT WAS LOCATED OVER SOUTHEAST COLORADO AND SOUTHERN KANSAS EARLY THIS AFTERNOON. AT THIS TIME...THE COLD FRONT IS EXPECTED TO REMAIN JUST TO THE NORTH OF THE OKLAHOMA PANHANDLE THROUGH TONIGHT. MEANWHILE...THE DRYLINE WAS LOCATED OVER EASTERN SECTIONS OF THE OKLAHOMA AND TEXAS PANHANDLES. THIS FEATURE IS EXPECTED TO MOVE BACK TO THE WESTERN SECTIONS OF THE PANHANDLES BEGINNING LATE THIS AFTERNOON THROUGH THE EVENING HOURS. A VIGOROUS UPPER LEVEL LOW PRESSURE SYSTEM CURRENTLY MOVING THROUGH SOUTHERN CALIFORNIA AND NEVADA IS FORECAST TO TRACK EASTWARD INTO NORTHERN NEW MEXICO BY EARLY SUNDAY MORNING. MOISTURE WILL CONTINUE TO INCREASE AHEAD OF THIS DISTURBANCE THROUGH TONIGHT. ALL THIS WILL SET THE STAGE FOR THE DEVELOPMENT OF THUNDERSTORMS. ISOLATED THUNDERSTORMS MAY FORM ALONG AND AHEAD OF THE DRYLINE OVER THE EASTERN OKLAHOMA AND EASTERN TEXAS PANHANDLES LATE THIS AFTERNOON INTO THE EARLY EVENING. HOWEVER...THE GREATEST THREAT FOR MORE WIDESPREAD THUNDERSTORMS IS EXPECTED TO OCCUR LATER TONIGHT INTO EARLY SUNDAY MORNING. ANY THUNDERSTORMS WHICH DEVELOP WILL HAVE THE POTENTIAL TO BECOME SEVERE AS THEY MOVE RAPIDLY TO THE NORTHEAST. THE MAIN SEVERE WEATHER THREATS WILL BE DAMAGING WINDS AND LARGE HAIL. ATMOSPHERIC WIND PROFILES ARE FORECAST TO BECOME MORE FAVORABLE LATER TODAY AND TONIGHT TO SUPPORT THE DEVELOPMENT OF ISOLATED TORNADOES...ESPECIALLY ALONG AND EAST OF A LINE EXTENDING FROM GUYMON OKLAHOMA TO AMARILLO TEXAS. SPOTTER GROUPS AND EMERGENCY MANAGEMENT OFFICIALS ACROSS ALL OF THE OKLAHOMA AND TEXAS PANHANDLES SHOULD REMAIN ALERT FOR LIKELY ACTIVATION LATER THIS AFTER,NOON OR TONIGHT. ANDRADE
The office that day
Everything else NWS Amarillo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 6:49 PM CDT | Severe Thunderstorm Warning | AMA | Donley | 41 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001
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; radar from the NEXRAD Level II archive.