Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 22, NWS Quad Cities, IA

July 16, 2007Jefferson County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 16, 2007, 6:26 PM CDT for Jefferson County, Iowa. It was in force for 49 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: Jul 16, 2007, 6:26 PM CDT (23:26 UTC)
Expired: Jul 16, 2007, 7:15 PM CDT
In force: 49 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Jefferson County, IA

The radar

The Quad Cities radar (KDVN), 126 km from the middle of the area, began a volume at 23:27 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
Jul 16, 6:44 PM CDT	HAIL 0.88	3 Ne Fairfield, IA	PENNY AND QUARTER SIZE HAIL AT JUNCTION OF PLEASANT PLAIN AND OLIVE.
Jul 16, 6:44 PM CDT	HAIL 1	3 Ne Fairfield, IA	PENNY TO QUARTER SIZE HAIL

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
Jul 16, 3:38 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.4 hours before the alert went out and 132 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1487 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 162326
TORDVN
IAC101-170015-
/O.NEW.KDVN.TO.W.0022.070716T2326Z-070717T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
626 PM CDT MON JUL 16 2007

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  JEFFERSON COUNTY IN SOUTHEAST IOWA...

* UNTIL 715 PM CDT.

* AT 623 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 6 MILES WEST OF PLEASANT PLAIN...OR ABOUT 9 MILES NORTH OF
  FAIRFIELD...MOVING SOUTHEAST AT 15 MPH.

* THE TORNADO WILL BE NEAR...
  PLEASANT PLAIN AROUND 635 PM CDT...
  FAIRFIELD AROUND 645 PM CDT...
  LOCKRIDGE AROUND 710 PM CDT...

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR EASTERN IOWA.

LAT...LON 4115 9195 4112 9203 4091 9199 4091 9174
      4114 9173

$$

SHEETS

2 follow-up statements

000 
WWUS53 KDVN 162337
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
635 PM CDT MON JUL 16 2007

IAC101-170015-
/O.CON.KDVN.TO.W.0022.000000T0000Z-070717T0015Z/
JEFFERSON IA-
635 PM CDT MON JUL 16 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR JEFFERSON
COUNTY...

AT 631 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 7 MILES SOUTHWEST OF 
PLEASANT PLAIN...OR ABOUT 9 MILES NORTH OF FAIRFIELD...MOVING 
SOUTHEAST AT 15 MPH.

THE TORNADO WILL BE NEAR...
  PLEASANT PLAIN AROUND 640 PM CDT...
  PERLEE AND EAST PLEASANT PLAIN AROUND 645 PM CDT...
  7 MILES NORTHEAST OF FAIRFIELD AROUND 650 PM CDT...
  BECKWITH AROUND 700 PM CDT...
  SALINA AND GERMANVILLE AROUND 705 PM CDT...
  FOUR CORNERS...LOCKRIDGE AND 7 MILES NORTH OF GLASGOW AROUND 715 PM
  CDT...

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR EASTERN IOWA.

LAT...LON 4115 9195 4112 9203 4091 9199 4091 9174
      4114 9173

$$

SHEETS

000 
WWUS53 KDVN 162347
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
646 PM CDT MON JUL 16 2007

IAC101-170015-
/O.CON.KDVN.TO.W.0022.000000T0000Z-070717T0015Z/
JEFFERSON IA-
646 PM CDT MON JUL 16 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR JEFFERSON
COUNTY...

AT 644 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED JUST EAST OF 
FAIRFIELD...MOVING SOUTH AT 15 MPH.

THE TORNADO WILL BE NEAR...
  7 MILES WEST OF LOCKRIDGE AROUND 655 PM CDT...
  GLASGOW AROUND 710 PM CDT...

ABANDON A MOBILE HOME OR VEHICLE IMMEDIATELY FOR A MORE SUBSTANTIAL
SHELTER. IF NO SAFE SHELTER IS AVAILABLE...MOVE TO A DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR EASTERN IOWA.

LAT...LON 4115 9195 4112 9203 4091 9199 4091 9174
      4114 9173

$$

SHEETS

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 16, 3:27 PM CDT	Severe Thunderstorm Warning	DVN	Linn	48 min
Jul 16, 3:39 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	51 min
Jul 16, 4:18 PM CDT	Tornado Warning	DVN	Johnson	42 min
Jul 16, 4:44 PM CDT	Flash Flood Warning	DVN	Johnson	6 hr
Jul 16, 4:49 PM CDT	Severe Thunderstorm Warning	DVN	Washington	56 min
Jul 16, 5:08 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	40 min
Jul 16, 5:36 PM CDT	Tornado Warning	DVN	Washington	39 min
Jul 16, 5:40 PM CDT	Flash Flood Warning	DVN	Washington	6 hr
Jul 16, 6:04 PM CDT	Severe Thunderstorm Warning	DVN	Henry	56 min
Jul 16, 6:13 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk	62 min
Jul 16, 6:51 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	54 min
Jul 16, 6:58 PM CDT	Flash Flood Watch	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	59 hr

Nearby

Tornado Warnings in Iowa, 2007 Every tornado warning in 2007 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.