Alert archive / Arkansas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Tulsa, OK

March 1, 2007Washington County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Mar 1, 2007, 4:44 AM CST for Washington County, Arkansas. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 1, 2007, 4:44 AM CST (10:44 UTC)
Expired: Mar 1, 2007, 5:05 AM CST
In force: 21 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Washington County, AR

The radar

The Western Arkansas radar (KSRX), 94 km from the middle of the area, began a volume at 10:45 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
Mar 1, 1:32 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 10.7 hours before the alert went out and 92 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 283 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1189 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KTSA 011044
SVRTSA
ARC143-011145-
/O.NEW.KTSA.SV.W.0021.070301T1044Z-070301T1145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
444 AM CST THU MAR 1 2007

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN NORTHWEST ARKANSAS

* UNTIL 545 AM CST

* AT 441 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE HAIL
  AND WINDS TO 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM SPRINGDALE TO 9 MILES SOUTHWEST OF FARMINGTON...
  MOVING EAST AT 50 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  FAYETTEVILLE...GREENLAND AND ELKINS.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3621 9411 3591 9436 3594 9395 3624 9386

$$

1 follow-up statement

000 
WWUS54 KTSA 011105
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
505 AM CST THU MAR 1 2007

ARC143-011115-
/O.CAN.KTSA.SV.W.0021.000000T0000Z-070301T1145Z/
WASHINGTON AR-
505 AM CST THU MAR 1 2007

...THE SEVERE THUNDERSTORM WARNING FOR WASHINGTON COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE
THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

GUSTY WINDS...SMALL HAIL AND VERY HEAVY RAIN WILL STILL BE POSSIBLE 
WITH THIS STORM ACROSS EASTERN WASHINGTON COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 8 AM.

LAT...LON 3621 9411 3591 9436 3594 9395 3624 9386

$$

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 1, 2:30 AM CST	Severe Thunderstorm Warning	TSA	Benton	41 min
Mar 1, 3:00 AM CST	Severe Thunderstorm Warning	TSA	Washington	45 min
Mar 1, 3:27 AM CST	Tornado Warning	TSA	Crawford, Sebastian	48 min
Mar 1, 3:40 AM CST	Severe Thunderstorm Warning	TSA	Benton	80 min
Mar 1, 3:47 AM CST	Tornado Warning	TSA	Franklin	58 min
Mar 1, 4:03 AM CST	Severe Thunderstorm Warning	TSA	Carroll, Madison	57 min
Mar 1, 4:08 AM CST	Severe Thunderstorm Warning	TSA	Sebastian	24 min
Mar 1, 4:13 AM CST	Tornado Warning	TSA	Carroll	28 min
Mar 1, 4:50 AM CST	Severe Thunderstorm Warning	TSA	Franklin	36 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2007 Every severe thunderstorm warning in 2007

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.