Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 42, NWS Amarillo, TX
NWS Amarillo, TX issued this severe thunderstorm warning at Apr 21, 2001, 9:41 PM CDT for Oldham County, Texas. It was in force for 34 min. 1 report 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, 9:41 PM CDT (02:41 UTC)
- Expired
- Apr 21, 2001, 10:15 PM CDT
- In force
- 34 min
- Issued by
- NWS Amarillo, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Oldham County, TX
The radar
The Amarillo radar (KAMA), 68 km from the middle of the area, began a volume at 02:43 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, 9:56 PM CDT | Hail 0.75 | Boys Ranch, 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 nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 2.7 hours before the alert went out and 69 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
- 1318 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 2056 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.6
The text
As transmitted, in the capitals the NWS used until 2016.
988 WUUS54 KAMA 220242 SVRAMA TXC359-220315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AMARILLO TX 941 PM CDT SAT APR 21 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN OLDHAM COUNTY IN THE TEXAS PANHANDLE * UNTIL 1015 PM CDT * AT 941 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTH OF BOYS RANCH...OR ABOUT 11 MILES NORTHEAST OF VEGA...MOVING NORTHEAST AT 60 MPH. * SOME LOCATIONS AFFECTED BY THE STORM INCLUDE... VEGA...BOYS RANCH AND WILDORADO LARGE HAIL...DAMAGING WINDS...AND TORRENTIAL RAINS ARE EXPECTED WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER. LAT...LON 3519 10266 3521 10216 3562 10217 3562 10258
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, 6 hours 57 minutes earlier.
Area forecast discussion, Apr 21, 2:44 PM CDT, 6 hours 57 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
Local storm report, Apr 21, 6:02 PM CDT, 3 hours 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
602 PM CDT SAT APR 21 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
g
0555 PM 5 W CLARENDEN TX 1.00 INCH HAIL
04/21/01 DONLEY OFF DUTY NWS FORECASTERLocal storm report, Apr 21, 6:05 PM CDT, 3 hours 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
605 PM CDT SAT APR 21 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0555 PM 5 W CLARENDEN TX 1.00 INCH HAIL
04/21/01 DONLEY OFF DUTY NWS FORECASTERLocal storm report, Apr 21, 6:16 PM CDT, 3 hours 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
616 PM CDT SAT APR 21 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0555 PM 5NW CLARENDON TX 1.00 INCH HAIL
04/21/01 DONLEY OFF DUTY NWS FORECASTERLocal storm report, Apr 21, 6:25 PM CDT, 3 hours 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
625 PM CDT SAT APR 21 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0555 PM 5NW CLARENDON TX 1.00 INCH HAIL
04/21/01 DONLEY OFF DUTY NWS FORECASTERLocal storm report, Apr 21, 9:22 PM CDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
922 PM CDT SAT APR 21 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0555 PM 5NW CLARENDON TX 1.00 INCH HAIL
04/21/01 DONLEY OFF DUTY NWS FORECASTER
0920 PM 5 E UMBARGER TX .88 INCH HAIL
04/21/01 RANDALL ARES SPOTTER
GThe office that day
Everything else NWS Amarillo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 8:54 PM CDT | Severe Thunderstorm Warning | AMA | Hemphill, Lipscomb | 51 min |
| Apr 21, 9:02 PM CDT | Severe Thunderstorm Warning | AMA | Ochiltree | 43 min |
| Apr 21, 9:14 PM CDT | Severe Thunderstorm Warning | AMA | Randall | 46 min |
| Apr 21, 9:31 PM CDT | Severe Thunderstorm Warning | AMA | Potter | 44 min |
| Apr 21, 9:51 PM CDT | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson, Moore | 24 min |
| Apr 21, 9:56 PM CDT | Severe Thunderstorm Warning | AMA | Carson | 34 min |
| Apr 21, 10:28 PM CDT | Severe Thunderstorm Warning | AMA | Hansford | 47 min |
| Apr 22, 8:35 AM CDT | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson | 55 min |
| Apr 22, 10:55 AM CDT | Severe Thunderstorm Warning | AMA | Collingsworth | 35 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.