Alert archive / Iowa / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 39, NWS La Crosse, WI

May 31, 2008Clayton County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 31, 2008, 7:17 PM CDT for Clayton County, Iowa. It was in force for 28 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: May 31, 2008, 7:17 PM CDT (00:17 UTC)
Expired: May 31, 2008, 7:45 PM CDT
In force: 28 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon

County Clayton County, IA

The radar

The La Crosse radar (KARX), 125 km from the middle of the area, began a volume at 00:19 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
May 31, 7:20 PM CDT	FUNNEL CLOUD	4 S Guttenberg, IA
May 31, 7:27 PM CDT	HAIL 0.75	4 S Guttenberg, IA

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
May 31, 2:51 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 129 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: 663 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1808 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KARX 010018
SVRARX
IAC043-010045-
/O.NEW.KARX.SV.W.0039.080601T0017Z-080601T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
717 PM CDT SAT MAY 31 2008

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CLAYTON COUNTY IN NORTHEAST IOWA...

* UNTIL 745 PM CDT

* AT 715 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
  OSTERDOCK...OR NEAR GUTTENBERG...MOVING SOUTHEAST AT 32 MPH. THIS
  WARNING EXTENDS THE PREVIOUS SEVERE THUNDERSTORM WARNING FOR
  CLAYTON COUNTY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TURKEY RIVER AROUND 725 PM...
  NORTH BUENA VISTA AROUND 735 PM...

THERE HAVE BEEN REPORTS OF ROTATION WITH THIS STORM. WHILE A TORNADO 
IS NOT BEING DETECTED ON RADAR...BE ALERT FOR THE POSSIBILITY OF A 
BRIEF TORNADO.

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS AND STAY AWAY FROM WINDOWS.

PLEASE REPORT ANY SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT OFFICE
AND TELL THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4268 9126 4283 9117 4280 9108 4274 9106
      4272 9103 4269 9094 4268 9089 4265 9089
      4264 9090 4264 9119
TIME...MOT...LOC 0017Z 303DEG 28KT 4271 9113

$$

BINAU

2 follow-up statements

000 
WWUS53 KARX 010032
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
732 PM CDT SAT MAY 31 2008

IAC043-010045-
/O.CON.KARX.SV.W.0039.000000T0000Z-080601T0045Z/
CLAYTON IA-
732 PM CDT SAT MAY 31 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR SOUTHEASTERN CLAYTON COUNTY...

AT 728 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR TURKEY RIVER...OR ABOUT 9 MILES SOUTHEAST OF GUTTENBERG...MOVING
SOUTHEAST AT 33 MPH.

REPORTS OF FUNNEL CLOUDS AND ROTATION HAVE BEEN RECEIVED WITH THIS 
STORM.

REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR
NO ADVANCED WARNING.

LAT...LON 4268 9126 4277 9108 4274 9106 4269 9094
      4269 9092 4267 9091 4267 9089 4265 9089
      4264 9090 4264 9119
TIME...MOT...LOC 0032Z 304DEG 29KT 4265 9099

$$

BINAU

000 
WWUS53 KARX 010042
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
741 PM CDT SAT MAY 31 2008

IAC043-010051-
/O.EXP.KARX.SV.W.0039.000000T0000Z-080601T0045Z/
CLAYTON IA-
741 PM CDT SAT MAY 31 2008

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLAYTON COUNTY
EXPIRES AT 745 PM CDT...

THE STORM WHICH PROMPTED THIS WARNING HAS WEAKENED AND NO LONGER
APPEARS CAPABLE OF PRODUCING SEVERE WEATHER.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR THE AREA UNTIL 9 PM.

LAT...LON 4268 9126 4277 9108 4274 9106 4269 9094
      4269 9092 4267 9091 4267 9089 4265 9089
      4264 9090 4264 9119
TIME...MOT...LOC 0041Z 304DEG 29KT 4260 9092

$$

BINAU

Nearby

Severe Thunderstorm Warnings in Iowa, 2008 Every severe thunderstorm warning in 2008

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.