Round Rock Weather

Fire Weather Index for Round Rock, Texas
Last Updated: 9/5/2008 1:01:34 PM

Current Readings

FWI

FFDC

SFDC

GFDC

BUI

ISI

DMC

FFMC

Temperature

Humidity

Wind Speed

Rainfall

As of

28.8

125

7.6

625

91.2

85.9°F

47%

0.00"

09/05/2008

Date	Temp ºF	Humid %	Wind mph	Rain in	FFMC	DMC	DC	ISI	BUI	FWI	FFDC	SFDC	GFDC
09/05/2008	85.9	47	5	0.00	91.2	83	625	7.6	125	28.8	VH	EX	HI
09/04/2008	87.2	43	9	0.00	91.5	81	618	10.9	122	36.3	EX	EX	VH
09/03/2008	87.6	46	22	0.00	91.5	78	611	31.1	119	69.3	EX	EX	EX
09/02/2008	94.7	39	15	0.00	91.8	76	604	18.4	116	49.8	EX	EX	EX
09/01/2008	92.3	44	11	0.00	90.9	73	596	11.8	111	36.9	EX	EX	VH
08/31/2008	91.4	49	5	0.00	90.9	70	588	7.2	108	26.1	VH	EX	HI
08/30/2008	90.7	49	7	0.00	90.9	68	579	8.5	106	28.9	VH	EX	HI
08/29/2008	92.3	47	4	0.00	90.9	66	570	6.7	102	24.2	HI	EX	HI
08/28/2008	94.0	49	5	0.00	90.9	63	561	7.2	98	24.9	VH	EX	HI
08/27/2008	93.4	49	7	0.00	90.9	60	552	8.5	94	27.3	VH	EX	HI
08/26/2008	94.3	44	5	0.00	90.9	57	543	7.2	90	23.9	HI	EX	HI
08/25/2008	93.6	46	4	0.00	90.4	54	534	6.2	86	20.9	HI	EX	HI
08/24/2008	89.9	57	5	0.00	89.8	51	525	6.2	82	20.4	HI	EX	HI
08/23/2008	93.2	49	3	0.00	89.8	49	516	5.3	79	17.8	HI	EX	HI
08/22/2008	92.3	50	12	0.00	89.3	46	507	10.1	76	27.6	VH	EX	VH
08/21/2008	92.7	56	5	0.01	84.2	44	498	2.8	72	10.3	MD	EX	MD
08/20/2008	86.7	54	2	1.83	58.9	42	489	0.4	69	0.8	LW	MD	MD
08/19/2008	81.4	80	4	0.14	63.8	96	857	0.7	150	4.4	LW	HI	MD
08/18/2008	83.6	68	6	0.00	87.4	169	878	4.8	229	24.0	HI	EX	HI
08/17/2008	84.3	60	6	0.01	89.0	168	870	6.0	226	28.0	VH	EX	HI
08/16/2008	90.7	51	10	0.00	91.0	166	862	11.0	224	41.8	EX	EX	VH
08/15/2008	95.6	47	3	0.00	92.2	164	853	7.4	221	32.2	EX	EX	HI
08/14/2008	96.6	33	4	0.00	93.0	161	844	9.0	218	36.6	EX	EX	HI
08/13/2008	91.2	44	7	0.00	90.5	157	834	8.0	213	33.8	EX	EX	HI
08/12/2008	89.7	58	11	0.00	89.7	154	825	9.9	210	38.8	EX	EX	VH
08/11/2008	92.7	51	10	0.00	91.2	152	816	11.3	208	42.3	EX	EX	VH
08/10/2008	97.5	37	9	0.00	93.1	150	807	13.7	205	47.7	EX	EX	VH
08/09/2008	96.8	34	12	0.00	93.0	147	797	17.1	202	54.7	EX	EX	EX
08/08/2008	96.8	39	2	0.00	92.0	144	787	6.7	198	29.8	VH	EX	HI
08/07/2008	94.9	42	9	0.00	91.2	141	777	10.4	194	39.7	EX	EX	VH

Station Information Name: Round Rock Altitude: 709' AMSL Latitude: 30.5486 Longitude: -97.6261 Forest Slope: 0% Brush Slope: 0% Brush Height: 4' Grass Slope: 0% Grass Curing: 85	Current Drought Days (Total)	15
	Current Rain Days (Total)	0
	Current Rain Total	0.00
	High Temperature/Date	101.0°F 08/03/2008
	High Humidity/Date	99% 05/06/2008
	High Wind Speed/Date	25 mph 01/31/2008
	High Rainfall/Date	2.71" 05/15/2008
	High FFMC/Date	100.3 08/27/2007
	High DMC/Date	169 08/18/2008
	High DC/Date	878 08/18/2008
	High ISI/Date	46.4 12/22/2007
	High BUI/Date	229 08/18/2008
	High FWI/Date	69.3 09/03/2008
	Low Temperature/Date	35.0°F 01/18/2008
	Low Humidity/Date	17% 01/31/2008
	Low Wind Speed/Date	0 mph 11/30/2007
	Low FFMC/Date	9.4 11/25/2007
	Low DMC/Date	1 07/27/2007
	Low DC/Date	46 05/15/2008
	Low ISI/Date	0.0 05/06/2008
	Low BUI/Date	3 07/27/2007
	Low FWI/Date	0.0 05/06/2008

Definitions:

BUI - Build Up Index
DC - Drought Code
DMC - Duff Moisture Code
FFDC - Forest Fire Danger Code
FFMC - Fine Fuel Moisture Code
GFDC - Grassland Fire Danger Code
FWI - Fire Weather Index
ISI - Initial Spread Index
SFDC - Scrubland (Brush) Fire Danger Code

Key to Fire Weather Index Indices
FFMC (Fine Fuel Moisture Code) This is a numerical rating of the moisture content of surface litter and other cured fine fuels. It shows the relative ease of ignition and flammability of fine fuels. The moisture content of fine fuels is very sensitive to the weather. Even a day of rain, or of fine and windy weather, will significantly affect the FFMC rating. The system uses a time lag of two-thirds of a day to accurately measure the moisture content in fine fuels. The FFMC rating is on a scale of 0 to 99. Any figure above 70 is high, and above 90 is extreme.

DMC (Duff Moisture Code) DMC is a numerical rating of the average moisture content of loosely compacted organic layers of moderate depth. The code indicates the depth that fire will burn in moderate duff layers and medium size woody material. Duff layers take longer than surface fuels to dry out but weather conditions over the past couple of weeks will significantly affect the DMC. The system applies a time lag of 12 days to calculate the DMC. A DMC rating of more than 30 is dry, and above 40 indicates that intensive burning will occur in the duff and medium fuels. Burning off operations should not be carried out when the DMC rating is above 40.

DC (Drought Code) The DC is a numerical rating of the moisture content of deep, compact, organic layers. It is a useful indicator of seasonal drought and shows the likelihood of fire involving the deep duff layers and large logs. A long period of dry weather (the system uses 52 days) is needed to dry out these fuels and affect the Drought Code. A DC rating of 200 is high, and 300 or more is extreme indicating that fire will involve deep sub-surface and heavy fuels. Burning off should not be permitted when the DC rating is above 300.

ISI: (Initial Spread Index) This indicates the rate fire will spread in its early stages. It is calculated from the FFMC rating and the wind factor. The open-ended ISI scale starts at zero and a rating of 10 indicates high rate of spread shortly after igition. A rating of 16 or more indicates extremely rapid rate of spread.

BUI (Build Up Index) This index shows the amount of fuel available for combustion, indicating how the fire will develop after initial spread. It is calculated from the Duff Moisture Code and the Drought Code. The BUI scale starts at zero and is open-ended. A rating above 40 is high, above 60 is extreme.

FWI (Fire Weather Index) Information from the ISI and BUI is combined to provide a numerical rating of fire intensity - the Fire Weather Index. The FWI indicates the likely intensity of a fire. The FWI is divided into four fire danger classes: Low 0 - 7 Moderate 8 - 16 High l7 - 31 Extreme 32+

FFDC (Forest Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in forest type vegetation (pine, beech). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

SFDC (Scrub Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in scrub type vegetation (manuka, gorse, broom). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

GFDC (Grass Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in grass type vegetation (dry grass, tussock). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

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