Alert archive / Iowa / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 49, NWS La Crosse, WI

July 7, 2003Mitchell County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 7, 2003, 2:27 AM CDT for Mitchell County, Iowa. It was in force for 48 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 7, 2003, 2:27 AM CDT (07:27 UTC)
Expired: Jul 7, 2003, 3:15 AM CDT
In force: 48 min
Issued by: NWS La Crosse, WI
Area: Counties, with a storm outline in the text

County Mitchell County, IA

The radar

The La Crosse radar (KARX), 145 km from the middle of the area, began a volume at 07:28 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
Jul 6, 9:20 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.5 hours before the alert went out and 181 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: 2301 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

106 
WUUS53 KARX 070727
SVRARX
IAC131-070815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
226 AM CDT MON JUL 7 2003

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MITCHELL COUNTY IN NORTH CENTRAL IOWA

* UNTIL 315 AM CDT

* AT 226 AM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
  THUNDERSTORM OVER ROCK CREEK...OR ABOUT 8 MILES SOUTHWEST OF
  OSAGE...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE...
  NEAR MITCHELL...AND TOETERVILLE AT 235 AM CDT...
  NEAR OSAGE...AND ORCHARD AT 240 AM CDT...
  NEAR STACYVILLE AT 245 AM CDT...
  NEAR BROWNVILLE...AND LITTLE CEDAR AT 250 AM CDT...
  NEAR NEW HAVEN AT 255 AM CDT...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR
YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

LAT...LON 4322 9303 4322 9288 4322 9256 4350 9257
          4350 9302

$$

THOMPSON

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 1:45 AM CDT	Severe Thunderstorm Warning	ARX	Floyd	60 min
Jul 7, 2:18 AM CDT	Severe Thunderstorm Warning	ARX	Chickasaw	57 min
Jul 7, 3:09 AM CDT	Flash Flood Warning	ARX	Mitchell	111 min
Jul 7, 3:18 AM CDT	Severe Thunderstorm Warning	ARX	Howard, Mitchell	42 min
Jul 7, 3:48 AM CDT	Tornado Warning	ARX	Chickasaw	42 min
Jul 7, 4:06 AM CDT	Severe Thunderstorm Warning	ARX	Clayton, Fayette	39 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2003 Every severe thunderstorm warning in 2003

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.