Alert archive / Arkansas / Special Weather Statements in 2009

Special Weather Statement, NWS Tulsa, OK

July 20, 2009Madison County, Arkansas

NWS Tulsa, OK issued this special weather statement at Jul 20, 2009, 12:36 PM CDT for Madison County, Arkansas. It was in force for 39 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
Jul 20, 2009, 12:36 PM CDT (17:36 UTC)
Expired
Jul 20, 2009, 1:15 PM CDT
In force
39 min
Issued by
NWS Tulsa, OK

County Madison County, AR

The radar

The Western Arkansas radar (KSRX), 96 km from the middle of the area, began a volume at 17:38 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.6 hours before the alert went out and 99 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2009-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 428 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2009-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
428 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
790 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this special weather statement went out at Jul 20, 12:29 PM CDT, 7 minutes earlier.

Area forecast discussion, Jul 20, 12:29 PM CDT, 7 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1229 PM CDT MON JUL 20 2009

.DISCUSSION...
ISOLATED THUNDERSTORMS HAVE DEVELOPED ACROSS NORTHWEST
ARKANSAS THIS AFTERNOON THEREFORE...HAVE ADDED VCTS
GROUP TO KXNA AND KFYV FOR THE AFTERNOON. MORE THUNDERSTORMS
ARE EXPECTED TO DEVELOP LATER THIS AFTERNOON AND TONIGHT
WITH SEVERAL OUTFLOW BOUNDARIES AND A WEAK FRONTAL BOUNDARY
DRAPED ACROSS THE AREA. A THUNDERSTORM COMPLEX IS ALSO EXPECTED
TO DEVELOP NORTH OF THE AREA AND AFFECT THE AREA OVERNIGHT.
THEREFORE...WILL KEEP TEMPO GROUPS FOR THUNDER IN THE FCST
FROM THIS EVENING ON INTO TUESDAY MORNING FOR ALL OF THE TAF SITES.
THIS WILL DROP CONDITIONS IN MVFR AND IFR RANGES.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   67  84  64  88 /  80  70  10  10
FSM   67  79  65  87 /  60  90  10  10
MLC   69  84  64  90 /  70  80  10  10
BVO   65  85  61  87 /  80  60  10  10
FYV   66  77  61  85 /  70  90  10  10
BYV   66  76  61  84 /  60  90  10  10
MKO   67  82  63  87 /  80  80  10  10
MIO   65  78  61  86 /  80  80  10  10
F10   67  84  63  89 /  80  70  10  10
HHW   70  83  67  89 /  60  70  10  10

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
AR...NONE.
&&

AVIATION...10.
Hazardous weather outlook, Jul 20, 5:04 AM CDT, 7 hours 32 minutes before
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In the hours before

Special weather statement, Jul 20, 12:36 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1236 PM CDT MON JUL 20 2009

ARZ011-201815-
MADISON AR-
1236 PM CDT MON JUL 20 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 115 PM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHWEST ARKANSAS
     CENTRAL MADISON

AT 1237 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3
MILES NORTHEAST OF GEORGETOWN...MOVING SOUTHEAST AT 5 MPH. SOME
LOCATIONS THAT WILL BE AFFECTED BY THIS STORM INCLUDE...GEORGETOWN...
HUNTSVILLE...AURORA...WESLEY...WITTER AND JAPTON.

THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO
50 MPH.

LAT...LON 3599 9357 3585 9386 3601 9395 3606 9394
      3616 9380
TIME...MOT...LOC 1737Z 318DEG 6KT 3603 9380

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 6:22 PM CDTSpecial Weather StatementTSASequoyah23 min
Jul 20, 12:40 PM CDTSpecial Weather StatementTSAMadison35 min
Jul 20, 1:23 PM CDTSpecial Weather StatementTSACarroll37 min
Jul 20, 1:27 PM CDTSevere Thunderstorm WarningTSACarroll36 min
Jul 20, 2:01 PM CDTSpecial Weather StatementTSAMadison44 min
Jul 20, 2:41 PM CDTSpecial Weather StatementTSAMadison34 min
Jul 20, 3:08 PM CDTSpecial Weather StatementTSAMadison37 min
Jul 20, 3:11 PM CDTSpecial Weather StatementTSAMadison34 min
Jul 20, 3:44 PM CDTSpecial Weather StatementTSABenton46 min

Nearby

Special Weather Statements in Arkansas, 2009Every special weather statement in 2009

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.